OPTICAL SUB-ASSEMBLY AND TELESCOPIC-SHAPED CORE CYLINDER MODULE THEREOF

Реферат: An optical sub-assembly comprising a filtering optical module, a light emitting module having a light emitting device (LED), at least a light receiving module, at least one wavelength filter, a fibre optic connector and cable having a fiber optic, and a telescopic-shaped core cylinder module having at least two tapered diameter core portions and at least a gel coating layer over an inner surface thereof is provided. A first optical signal of the light emitting device is directed to the tapered diameter core portions, the at least one wavelength filter, and onto the fibre optic. The telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on the LED, and the at least a gel coating layer absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions.

Заявка: 1: A telescopic-shaped core cylinder module of an optical sub-assembly , comprising:a cylinder core having at least two tapered diameter core portions comprising a first and second core portion, wherein a diameter of the first core portion is larger than a diameter of a second core portion,wherein, the telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on a light source emitting optical signals directed through the first and second core portions.2: The telescopic-shaped core cylinder module of claim 1 , wherein the shapes of the first and second core portions are conical claim 1 , respectively.3: The telescopic-shaped core cylinder module of claim 1 , further comprising:a first transitional core portion having a cylindrical shape extending from a first end of the first core portion, wherein a diameter of the first transitional core portion is larger than the diameter of the first core portion; anda first guiding core portion having a conical shape radially expanding outwardly from the first transitional core portion opposite to the first core portion.4. (canceled)5: The telescopic-shaped core cylinder module of claim 1 , further comprising:a first inner guiding core portion having a conical shape positioned between the first and second core portions; anda second inner guiding core portion having a conical shape radially expanding outwardly from the second core portion opposite to the first inner guiding core portion.6: The telescopic-shaped core cylinder module of claim 5 , further comprising:a second transitional core portion having a cylindrical shape extending from the second inner guiding core portion opposite to the second core portion, wherein a diameter of the second transitional core portion is smaller than the diameter of the second core portion; anda second guiding core portion having a conical shape radially expanding outwardly from the second transitional core portion opposite to the second inner guiding core portion.7: The telescopic-shaped core cylinder module of claim 1 , wherein the amount of the at least two tapered diameter core portions is three.8: The telescopic-shaped core cylinder module of claim 1 , wherein the amount of the at least two tapered diameter core portions is greater than three.9. (canceled)10: The telescopic-shaped core cylinder module of claim 3 , further comprising at least a gel coating layer over an inner surface thereof claim 3 , absorbing wavelengths of optical signals reflected in and to the tapered diameter core portions.11: The telescopic-shaped core cylinder module of claim 10 , wherein the difference in the size of the diameters of the first transitional core portion and first core portion is configured to contain excess gel from the at least a gel coating layer over the inner surface areas of the telescopic-shaped core cylinder module following application thereto.12: The telescopic-shaped core cylinder module of claim 1 , wherein a material of the telescopic-shaped core cylinder module is stainless steel.13: A telescopic-shaped core cylinder module claim 1 , comprising:a cylinder core having at least two tapered diameter core portions comprising a first and second core portion, wherein a diameter of the first core portion is larger than a diameter of a second core portion,wherein, the telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on a light source emitting optical signals directed through the first and second core portions.14: The telescopic-shaped core cylinder module of claim 13 , wherein the shapes of the first and second core portions are conical claim 13 , respectively.15: The telescopic-shaped core cylinder module of claim 13 , further comprising:a first transitional core portion having a cylindrical shape extending from a first end of the first core portion, wherein a diameter of the first transitional core portion is larger than the diameter of the first core portion; anda first guiding core portion having a conical shape radially expanding outwardly from the first transitional core portion opposite to the first core portion.16: The telescopic-shaped core cylinder module of claim 13 , further comprising:a first inner guiding core portion having a conical shape positioned between the first and second core portions; anda second inner guiding core portion having a conical shape radially expanding outwardly from the second core portion opposite to the first inner guiding core portion.17: The telescopic-shaped core cylinder module of claim 16 , further comprising:a second transitional core portion having a cylindrical shape extending from the second inner guiding core portion opposite to the second core portion, wherein a diameter of the second transitional core portion is smaller than the diameter of the second core portion; anda second guiding core portion having a conical shape radially expanding outwardly from the second transitional core portion opposite to the second inner guiding core portion.18: The telescopic-shaped core cylinder module of claim 13 , wherein the amount of the at least two tapered diameter core portions is three.19: The telescopic-shaped core cylinder module of claim 13 , wherein the amount of the at least two tapered diameter core portions is greater than three.20: The telescopic-shaped core cylinder module of claim 15 , further comprising at least a gel coating layer over an inner surface thereof claim 15 , absorbing wavelengths of optical signals reflected in and to the tapered diameter core portions.21: The telescopic-shaped core cylinder module of claim 20 , wherein the difference in the size of the diameters of the first transitional core portion and first core portion is configured to contain excess gel from the at least a gel coating layer over the inner surface areas of the telescopic-shaped core cylinder module following application thereto.22: The telescopic-shaped core cylinder module of claim 13 , wherein a material of the telescopic-shaped core cylinder module is stainless steel.

Описание: This application is a division of U.S. nonprovisional patent application Ser. No. 16/699,664, filed Dec. 1, 2019, the contents of which are incorporated herein by reference as if fully disclosed hereinExample embodiments relate generally to the field of optical communications and, more particularly, to optical sub-assemblies and a telescopic-shaped core cylinder module thereof.Growing demand for higher performance and speed has led to the widespread use of optical fibres in communications. In optical communication systems, light is used to send data to a remote end via an optical fibre in the form of pulses of light, instead of electrical current. A fibre optic transceiver is a key component in the communication system and may be classified by fibre mode, transfer rate, transmission distance, wavelength, and connector type. One connector type transceiver is a bi-directional (BiDi) transceiver and a key component of the BOSA is a BOSA (bi-directional Optical Sub-Assembly).A BOSA uses two independent wavelength channels, one to transmit and one to receive transmissions to and from interconnected devices, over a single fibre strand. The transmit wavelength at one connection end matches the receive wavelength at an opposing connection end and vice versa. The BOSA is capable of separating transmit (Tx) data and receiving (Rx) data at each end.Generally, a BOSA is made up of an optical emitter having a light source, such as a laser diode, an optical receiver having a light receiving source, such as a photodiode, a wavelength filter, passing light at one wavelength while reflecting light at another wavelength, and an optical connector, outputting the emitted light and inputting the received light, surrounded by a housing. Tx data is transmitted by the optical emitter through the wavelength filter to an optical fibre in the optical connector. Rx data is transmitted via the optical fibre through the filter unit to the optical receiver.While the wavelength filter is capable of separating the Tx data and Rx data, all laser applications are prone to surface reflections, whereby some of the emitted light launched by the laser source is reflected back into the interior of the housing and some of the light received or reflected back from the optical fibre passes through the wavelength filter and impinges on the laser diode. These surface reflections create problems for the BOSA, increasing noise therein or causing operational failure. One or more additional filters may be added to the BOSA, such as a blocking filter over the photodiode to block light of the laser diode's wavelength; however, as additional filters are added, costs and complexity increase and reliability and focusing stability of the emitted light onto the optical fibre may be degraded.For the laser source, surface reflections off targeted surfaces back into the laser source decreases the stability and operating lifespan thereof through damage, unexpected laser problems, or overheating. One or more additional components may also be added to the BOSA, such as an isolator, which is an optical component that emits a circularly polarized beam and allows light to transmit in only a single direction; however, isolators have more parts and are larger than filters, which increases the costs and complexity of the BOSA even further.Optical sub-assemblies and telescopic-shaped core cylinder modules thereof are provided.In an embodiment, an optical sub-assembly, comprising a filtering optical module, a light emitting module, at least a light receiving module, a fibre optic connector, a fibre optic cable, and a telescopic-shaped core cylinder module is provided.The filtering optical module comprises a first filtering module end, a second filtering module end, at least a third filtering module end, and a mounting and pass-through structure. The second filtering module end is positioned opposite to the first filtering module end. The first and second filtering module ends include a first filtering module core and a second filtering module core, respectively. The first and second filtering module cores have a first central axis. The at least a third filtering module end includes at least a third filtering module core and at least a third central axis perpendicular to the first central axis of the first and second filtering module cores. The mounting and pass-through structure having a central pass-through opening, a flat backing portion, an angled mount structure having a mounting angle, and a flat mount structure, wherein the first central axis and at least a third central axis passes through the central pass-through opening.The light emitting module includes a light emitting device, emitting light, fixedly positioned in the first filtering module core. The emitted light comprises a first optical signal.The at least a light receiving module has a light receiving device, receiving light, fixedly positioned in the at least a third filtering module core. The received light comprises a second optical signal.The fibre optic connector comprises a connector body. The fibre optic cable comprises a fibre optic. The fibre optic cable is fixedly positioned in the fibre optic connector outputting and inputting the first optical signal and the second optical signal.The telescopic-shaped core cylinder module of an optical sub-assembly, comprising a first cylinder core end, a second cylinder core end, a cylinder core, and at least a gel coating layer is provided. The cylinder core has at least two tapered diameter core portions comprising a first and second core portion. A diameter of the first core portion is larger than a diameter of a second core portion and the shapes of the first and second core portions are conical. The first cylinder core end encompasses the first core portion and a portion of the second core portion and the second cylinder core end encompasses a portion of the second core portion not encompassed by the first cylinder core end. The at least a gel coating layer is over an inner surface of the telescopic-shaped core cylinder module. The telescopic-shaped core cylinder module is integrally formed and configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions.In an embodiment, the optical sub-assembly further comprises at least one wavelength filter, a least one blocking filter, a connector collar, and a boot. The least one wavelength filter is fixedly positioned on the angled mount structure of the filtering optical module and separates the directed light paths of the first optical signal and second optical signal. The at least one blocking filter is fixedly positioned on the flat mount structure and flush with the flat backing portion, blocking the emitted light from passing therethrough. The connector collar includes an end portion having an annular protrusion, fixedly positioned on the second filtering module end, damping the connector body. The boot has an undercut and is fixedly positioned on the end portion of the connector collar, wherein the annular protrusion of the connector collar is snap-fit assembled to the undercut.In some embodiments, the first optical signal of the light emitting device positioned along the first central axis is directed to the at least two tapered diameter core portions, the at least one wavelength filter, and onto the fibre optic. The second optical signal of the light receiving device positioned along the at least a third central axis perpendicular to the first central axis is received from the fibre optic and the least one wavelength filter.In an embodiment, a telescopic-shaped core cylinder module of an optical sub-assembly, comprising a first cylinder core end, a second cylinder core end, a cylinder core, and at least a gel coating layer is provided. The cylinder core has at least two tapered diameter core portions comprising a first and second core portion. A diameter of the first core portion is larger than a diameter of a second core portion and the shapes of the first and second core portions are conical. The first cylinder core end encompasses the first core portion and a portion of the second core portion and the second cylinder core end encompasses a portion of the second core portion not encompassed by the first cylinder core end. The at least a gel coating layer is over an inner surface of the telescopic-shaped core cylinder module. The telescopic-shaped core cylinder module is integrally formed and configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions.In some embodiments, the telescopic-shaped core cylinder module further comprises a first transitional core portion, a second transitional core portion, a first guiding core portion, a second guiding core portion, a first inner guiding core portion, and a second inner guiding core portion. The first transitional core portion has a cylindrical shape extending from a first end of the first core portion, wherein a diameter of the first transitional core portion is larger than the diameter of the first core portion. The difference in the size of the diameters of the first transitional core portion and first core portion is configured to contain excess gel from the at least a gel coating layer over the inner surface areas of the first core portion of the of the telescopic-shaped core cylinder module following application over an inner surface thereof. The second transitional core portion has a cylindrical shape extending from the second inner guiding core portion opposite to the second core portion, wherein a diameter of the second transitional core portion is smaller than the diameter of the second core portion. The first guiding core portion has a conical shape radially expanding outwardly from the first transitional core portion opposite to the first core portion. The second guiding core portion has a conical shape radially expanding outwardly from the second transitional core portion opposite to the second inner guiding core portion. The first inner guiding core portion has a conical shape and is positioned between the first and second core portions. The second inner guiding core portion has a conical shape radially expanding outwardly from the second core portion opposite to the first inner guiding core portion.In some embodiments, the amount of the at least two tapered diameter core portions is three. In some embodiments, the amount of the at least two tapered diameter core portions is greater than three.In some embodiments, the amount of the at least a gel coating layer of the telescopic-shaped core cylinder module is two coating layers.The following describes various principles related to optical communication systems by way of reference to specific examples of optical sub-assemblies, including arrangements and examples of filtering optical modules, light emitting modules, light receiving modules, fiber optic connectors and cables and telescopic-shaped core cylinder modules embodying innovative concepts. More particularly, but not exclusively, such innovative principles are described in relation to selected examples of filtering optical modules, light emitting modules, light receiving modules, fiber optic connectors and cables and telescopic-shaped core cylinder modules and well-known functions or constructions are be described in detail for purposes of succinctness and clarity. Nonetheless, one or more of the disclosed principles can be incorporated in various other embodiments of fiber optic connectors and adapters to achieve any of a variety of desired outcomes, characteristics, and/or performance criteria.Thus, filtering optical modules, light emitting modules, light receiving modules, fiber optic connectors and cables and telescopic-shaped core cylinder modules having attributes that are different from those specific examples discussed herein can embody one or more of the innovative principles, and can be used in applications not described herein in detail. Accordingly, embodiments of filtering optical modules, light emitting modules, light receiving modules, fiber optic connectors and cables and telescopic-shaped core cylinder modules not described herein in detail also fall within the scope of this disclosure, as will be appreciated by those of ordinary skill in the relevant art following a review of this disclosure.Example embodiments as disclosed herein are directed to optical sub-assemblies and telescopic-shaped core cylinder modules thereof. The optical sub-assemblies may be applicable to, as an example, optical line terminals (OLTs) installed in a central control station of a passive optical network (PON) system, which is a type of fiber-to-the-curb (FTTC), fiber-to-the-building (FTTB), or fiber-to-the-home (FTTH) system, employing point-to-multiple point network architecture, and devices and equipment on a remote users premises of the FTTC, FTTB, or FTTH system. In an embodiment, an optical sub-assembly comprising a filtering optical module, a light emitting module having a light emitting device and a light-emission-side lens, at least a light receiving module having a light-reception-side lens, at least one wavelength filter, a fibre optic connector, a fibre optic cable having a fiber optic, and a telescopic-shaped core cylinder module having tapered diameter core portions and at least a gel coating layer, is provided. A first optical signal of the light emitting device is directed to the light-emission-side lens, the tapered diameter core portions, the least one wavelength filter, and onto the fibre optic. The second optical signal of the light receiving device is received from the fibre optic, the least one wavelength filter, and the light-reception-side lens. The telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions, taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions.is a schematic perspective view of an optical sub-assembly, according to an example embodiment. is an exploded view of the optical sub-assembly of , according to an example embodiment. is a schematic perspective view of the optical sub-assembly of with line A-A, according to an example embodiment. is a schematic cross-sectional view of the optical sub-assembly of along line A-A in , according to an example embodiment. Referring to , in an embodiment, an optical sub-assembly , comprising a filtering optical module , a light emitting module , at least a light receiving module , a fibre optic connector , a fibre optic cable , and a telescopic-shaped core cylinder module is provided.is a schematic perspective side view of the interior of the filtering optical module of an optical sub-assembly, according to an example embodiment. is a schematic perspective top view of the filtering optical module of , according to an example embodiment. is a schematic perspective end view of the second filtering module end of the filtering optical module of , according to an example embodiment. is a schematic perspective end view of the first filtering module end of the filtering optical module of , according to an example embodiment. Referring to , and referring to , the filtering optical module comprises a first filtering module end , a second filtering module end , at least a third filtering module end , and a mounting and pass-through structure . The second filtering module end is positioned opposite to the first filtering module end . The first and second filtering module ends , include a first filtering module core and a second filtering module core , respectively. The first and second filtering module cores , have a first central axis . The at least a third filtering module end includes at least a third filtering module core and at least a third central axis perpendicular to the first central axis of the first and second filtering module cores , . The mounting and pass-through structure having a central pass-through opening , a flat backing portion , an angled mount structure having a mounting angle, and a flat mount structure , wherein the first central axis and at least a third central axis passes through the central pass-through opening .In some embodiments, the optical sub-assembly further comprises at least one wavelength filter and at least one blocking filter . The at least one wavelength filter is fixedly positioned on the angled mount structure of the filtering optical module and separates the directed light paths of the first optical signal and a second optical signal of at least a light receiving module having a light receiving device, receiving light, fixedly positioned in the at least a third filtering module core . The at least one blocking filter is fixedly positioned on the flat mount structure and flush with the flat backing portion , blocking the emitted light from passing therethrough. Those of ordinary skill in the relevant art may readily appreciate that in some embodiments the optical sub-assembly may comprises more than one light receiving module, wavelength filter and blocking filter and the embodiments are not limited thereto. The amount of light receiving modules, wavelength filters and blocking filters determines the amount of structures required in the filtering optical module and the embodiments are not limited thereto. As long as the respective light paths of the optical signals of the light emitting module may be directed and the at least a light receiving module may be separated or blocked for operation of the optical sub-assembly .is a schematic perspective top view of an optical sub-assembly without a light emitting module, at least a light receiving module, connector collar, and booth, according to an example embodiment. is a schematic perspective side view of the interior of the optical sub-assembly of , according to an example embodiment. is an exploded view of the interior of the optical sub-assembly of , according to an example embodiment. Referring to , and referring to , in an embodiment, the fibre optic connector comprises a connector body and a ferrule . The connector body , includes a first connector body end having a sloped ferrule core and a second connector body end having a buffer clamp core . The ferrule has a first ferrule end , a second ferrule end and a ferrule core , wherein a side of the first ferrule end is slanted at an angle in a same direction and of less than the mounting angle of the angled mount structure . The slanted side of the first ferrule end assists in mitigating reflected light to impinge on the light emitting device.In an embodiment, the fibre optic cable includes a fibre optic , a fibre optic coating, and a buffer tube . The fibre optic has a first optic portion , second optic portion and a third optic portion . The fibre optic cable is fixedly positioned in the fibre optic connector , wherein the third optic portion is positioned in a central axis of the buffer clamp core and the first and second optic portions , are positioned in a stepped adjusted central axis of the sloped ferrule core , respectively, outputting and inputting the first optical signal and the second optical signal.is a schematic perspective side view of an optical sub-assembly without a light emitting module and least a light receiving module, according to an example embodiment. is an exploded view of the interior of the optical sub-assembly of , according to an example embodiment. Referring to , and referring to , in an embodiment, the optical sub-assembly further comprises a connector collar and a boot . The connector collar includes an end portion having an annular protrusion, fixedly positioned on the second filtering module end , clamping the connector body and surrounding portions of the ferrule , the sloped ferrule core , and the buffer clamp core . The boot has an undercut and is fixedly positioned on the end portion of the connector collar and surrounding the buffer clamp core and a portion of the sloped ferrule core , wherein the annular protrusion of the connector collar is snap-fit assembled to the undercut.is a schematic perspective side view of the interior of the filtering optical module and telescopic-shaped core cylinder module of an optical sub-assembly, according to an example embodiment. is a schematic perspective side view of the interior of the telescopic-shaped core cylinder module of an optical sub-assembly, according to an example embodiment. is a schematic perspective end view of the second cylinder core end of the telescopic-shaped core cylinder module of , according to an example embodiment. is a schematic perspective end view of the first cylinder core end of the telescopic-shaped core cylinder of , according to an example embodiment. Referring to , and referring to , in an embodiment, the telescopic-shaped core cylinder module comprises a first cylinder core end having a cylindrical shape, a second cylinder core end having a conical shape, a cylinder core , and at least a gel coating layer. The cylinder core has at least two tapered diameter core portions, comprising a first and second core portion , . The diameter of a first core portion is larger than a diameter of a second core portion and the shapes of the first and second core portions , are conical. The first cylinder core end encompasses the first core portion and a portion of the second core portion and the second cylinder core end encompasses a portion of the second core portion not encompassed by the first cylinder core end . The at least a gel coating layer is over an inner surface of the telescopic-shaped core cylinder module . The telescopic-shaped core cylinder module is integrally formed and configured to perform isolation on optical signals via the tapered diameter core portions , , taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions , .In an embodiment, the at least a light receiving module has a light receiving device, receiving light, and a protective casing having a light-reception-side lens, directing rays to the light receiving device, encompassing the light receiving device, fixedly positioned in the at least a third filtering module core . Those of ordinary skill in the relevant art may readily appreciate that the at least a light receiving module may comprise of less, more or substitute functioning elements known by those skilled in the relevant art and the embodiments are not limited thereto. The received light comprises a second optical signal.In some embodiments, the light receiving device of the at least a light receiving module is a 1.25 Gb/s to 100 Gb/s InGaAs PIN photodiode; however, the embodiments are not limited thereto. Those of ordinary skill in the relevant art may readily appreciate that other types of light receiving devices having other types of photodiodes may be employed depending upon application, as long as the second optical signal of the light receiving device positioned along the at least a third central axis perpendicular to the first central axis , can be received from the first optic portion of the fibre optic , the at least one wavelength filter , and the light-reception-side lens.is a schematic perspective side view of the interior of the filtering optical module , light emitting module, and telescopic-shaped core cylinder module of an optical sub-assembly, according to an example embodiment. is a schematic perspective top view of the interior of the filtering optical module , light emitting module, and telescopic-shaped core cylinder module of , according to an example embodiment. Referring to , and referring to , in an embodiment, the light emitting module includes a light emitting device, emitting light, a light-emission-side lens , refracting the emitted light, and a protective casing having a central window, encompassing the light emitting device and light-emission-side lens , fixedly positioned in the first filtering module core . Those of ordinary skill in the relevant art may readily appreciate that the light emitting module may comprise of less, more or substitute functioning elements known by those skilled in the relevant art and the embodiments are not limited thereto. The emitted light comprises a first optical signal.Those of ordinary skill in the relevant art may readily appreciate that the light emitting module may further comprise additional elements, and the embodiments are not limited thereto. As long as the first optical signal of the light emitting device can be directed to the light-emission-side lens , the tapered diameter core portions , , the at least one wavelength filter , and onto the fibre optic .In some embodiments, the light emitting device of the light emitting module is a 1.26-μm to 1.65-μm 1.25 Gb/s to 100 Gb/s TO-56-packaged distributed-feedback (DFB) laser diode; however, the embodiments are not limited thereto. Those of ordinary skill in the relevant art may readily appreciate that other types of light emitting devices may be employed depending upon application, as long as the first optical signal of the light emitting device can be directed to the light-emission-side lens , the tapered diameter core portions , , the at least one wavelength filter , and onto the fibre optic .In an embodiment, a telescopic-shaped core cylinder module of an optical sub-assembly , comprising a first cylinder core end having a cylindrical shape, a second cylinder core end having a conical shape, a cylinder core , and at least a gel coating layer is provided. Referring to , the cylinder core has at least two tapered diameter core portions comprising a first and second core portion , . The diameter of a first core portion is larger than a diameter of a second core portion and the shapes of the first and second core portions , are conical. The first cylinder core end encompasses the first core portion and a portion of the second core portion and the second cylinder core end encompasses a portion of the second core portion not encompassed by the first cylinder core end . The at least a gel coating layer is over an inner surface of the telescopic-shaped core cylinder module . The telescopic-shaped core cylinder module is integrally formed and configured to perform isolation on optical signals via the tapered diameter core portions , , taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions , .In some embodiments, the amount of the at least two tapered diameter core portions is three. In some embodiments, the amount of the at least two tapered diameter core portions is greater than three.In some embodiments, the amount of the at least a gel coating layer of the telescopic-shaped core cylinder module is two coating layers.In some embodiments, the telescopic-shaped core cylinder module further comprises a first transitional core portion , a second transitional core portion , a first guiding core portion , a second guiding core portion , a first inner guiding core portion , and a second inner guiding core portion . The first transitional core portion has a cylindrical shape extending from a first end of the first core portion , wherein a diameter of the first transitional core portion is larger than the diameter of the first core portion . The difference in the size of the diameters of the first transitional core portion and first core portion is configured to contain excess gel from the at least a gel coating layer over the inner surface areas of the first core portion of the of the telescopic-shaped core cylinder module following application over an inner surface thereof. The second transitional core portion has a cylindrical shape extending from the second inner guiding core portion opposite to the second core portion , wherein a diameter of the second transitional core portion is smaller than the diameter of the second core portion . The first guiding core portion has a conical shape radially expanding outwardly from the first transitional core portion opposite to the first core portion . The second guiding core portion has a conical shape radially expanding outwardly from the second transitional core portion opposite to the second inner guiding core portion . The first inner guiding core portion has a conical shape and is positioned between the first and second core portions , . The second inner guiding core portion has a conical shape radially expanding outwardly from the second core portion opposite to the first inner guiding core portionIn some embodiments, the diameter of the second transitional core portion , second core portion , first core portion , and first transitional core portion is 0.7 mm, 1.2 mm, 1.6 mm, and 2 mm, respectively, having differences of 0.5 mm, 0.4 mm and 0.4 mm, respectively; however, the embodiments are not limited thereto. Those of ordinary skill in the relevant art may readily appreciate that the diameters may vary depending upon application and requirements, such as, the size of the optical sub-assembly . Generally, the size of the diameters of the second transitional core portion , second core portion , first core portion , and first transitional core portion may range from 0.1 mm to 2 mm, 0.6 mm to 2.5 mm, 1 mm to 2.9 mm, and 1.4 mm to 3.3 mm, respectively. As long as isolation can be performed on optical signals via the tapered diameter core portions , , taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions , and the difference in the size of the diameters of the first transitional core portion and the first core portion can contain excess gel from the at least a gel coating layer over the inner surface areas of the first core portion of the of the telescopic-shaped core cylinder module following application over an inner surface thereof.In some embodiments, the at least a gel coating layer of the telescopic-shaped core cylinder module can absorb a full range of wavelengths between 1260 and 1670 nm in various bands; however, the embodiments are not limited thereto. Those of ordinary skill in the relevant art may readily appreciate that as technology changes, so may the required wavelength ranges or bands. As long as the at least a gel coating layer, along with the tapered diameter core portions , , can substantially reduce emitted light launched by the light emitting device, reflecting back into the interior of the filtering optical module via the structures therein and light received or reflected back from the optical fibre , passing through the least one wavelength filter and impinging on the light emitting device.In some embodiments, the at least a gel coating layer is made up of at least a metal oxide; however, the embodiments are not limited thereto. As long as the at least a gel coating layer can be applied over the inner surface areas of the telescopic-shaped core cylinder module , absorbing a full range of wavelengths between 1260 and 1670 nm in various bands.In some embodiments, the material of the filtering optical module , fibre optic connector and telescopic-shaped core cylinder module is stainless steel; however, the embodiments are not limited thereto. Those of ordinary skill in the relevant art may readily appreciate that other materials may be employed, such as aluminum or high-temperature polymer, as long as the operation of the optical sub-assembly is not hindered and the telescopic-shaped core cylinder module can perform isolation on optical signals via the tapered diameter core portions , , taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, can absorb wavelengths of the optical signals reflected in and to the tapered diameter core portions , .In some embodiments, the mounting angle of the angled mount structure is around 45° degrees. However, those of ordinary skill in the relevant art may readily appreciate that adjustments may be made to the mounting angle depending upon design requirements and the embodiments are not limited thereto. As an example, and not to be limiting, for two angled mount structures, the mounting angle may be around 45° degrees in one direction and 45° degrees in an opposite direction and the embodiments are not limited thereto. As long as the first optical signal of the light emitting device positioned along the first central axis , can be directed to the light-emission-side lens , the tapered diameter core portions , , the least one wavelength filter , and onto the first optic portion of the fibre optic and the optical signals of the light receiving devices positioned along the central axis' perpendicular to the first central axis , can be received from the first optic portion of the fibre optic , the wavelength filters, and the light-reception-side lenses.In some embodiments, the mechanical fixing means of the optical sub-assemblies comprise adhesion or welding, such as laser welding; however, the embodiments are not limited thereto. Those of ordinary skill in the relevant art may readily appreciate that other fixing means may be used for the optical sub-assemblies of the embodiments, as long as the operation of the optical sub-assembly is not hindered and the telescopic-shaped core cylinder module can perform isolation on optical signals via the tapered diameter core portions , , taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions , .In the embodiments, optical sub-assemblies and telescopic-shaped core cylinder modules thereof are provided. The optical sub-assembly comprises a light emitting module having a light emitting device, such as a laser diode, a least a light receiving module having a light receiving device, such as a photodiode, and a light-reception-side lens, at least one wavelength filter , passing light at one wavelength while reflecting light at another wavelength, a fibre optic connector , a fibre optic cable having a fiber optic , assembled and fixedly secured in the fibre optic connector , a filtering optical module , and an integrally formed telescopic-shaped core cylinder module having tapered diameter core portions , and at least a gel coating layer.Tx data of a first optical signal of the light emitting device is directed to the light-emission-side lens , the tapered diameter core portions , , the at least one wavelength filter , and onto a fibre optic . Rx data of a second optical signal of the light receiving device is received from the fibre optic , the least one wavelength filter , and the light-reception-side lens.The problems of surface reflection for an optical sub-assembly, increasing noise therein or causing operational failure are mitigated via the integrally formed telescopic-shaped core cylinder module and at least a gel coating layer. The telescopic-shaped core cylinder module is configured to perform isolation on optical signals via the tapered diameter core portions , , taperedly shrinking the area for reflected light to impinge on the light emitting device, and the at least a gel coating layer, absorbing wavelengths of the optical signals reflected in and to the tapered diameter core portions , . Thus, emitted light launched by the light emitting device, reflecting back into the interior of the filtering optical module via the structures therein and light received or reflected back from the optical fibre , passing through the least one wavelength filter and impinging on the light emitting device are substantially reduced. At least one blocking filter is employed over the photodiode to block light of the laser diode's wavelength along with the least one wavelength filter . Reliability and focusing stability of the emitted light onto the optical fibre are held without additional costs and complexity. For the light emitting device, surface reflections off targeted surfaces back into the light emitting device decreases the stability and operating lifespan thereof through damage, unexpected laser problems, or overheating. Isolation is performed via the integrally formed telescopic-shaped core cylinder module and at least a gel coating layer. Thus, an isolator is not required, and the additional costs and complexity of employing the isolator is avoided.The presently disclosed inventive concepts are not intended to be limited to the embodiments shown herein, but are to be accorded their full scope consistent with the principles underlying the disclosed concepts herein. Directions and references to an element, such as “up,” “down,”, “upper,” “lower,” “horizontal,” “vertical,” “left,” “right,” and the like, do not imply absolute relationships, positions, and/or orientations. Terms of an element, such as “first” and “second” are not literal, but, distinguishing terms. As used herein, terms “comprises” or “comprising” encompass the notions of “including” and “having” and specify the presence of elements, operations, and/or groups or combinations thereof and do not imply preclusion of the presence or addition of one or more other elements, operations and/or groups or combinations thereof. Sequence of operations do not imply absoluteness unless specifically so stated. Reference to an element in the singular, such as by use of the article “a” or “an”, is not intended to mean “one and only one” unless specifically so stated, but rather “one or more”. As used herein, “and/or” means “and” or “or”, as well as “and” and “or.” As used herein, ranges and subranges mean all ranges including whole and/or fractional values therein and language which defines or modifies ranges and subranges, such as “at least,” “greater than,” “less than,” “no more than,” and the like, mean subranges and/or an upper or lower limit. All structural and functional equivalents to the elements of the various embodiments described throughout the disclosure that are known or later come to be known to those of ordinary skill in the relevant art are intended to be encompassed by the features described and claimed herein. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure may ultimately explicitly be recited in the claims. No element or concept disclosed herein or hereafter presented shall be construed under the provisions of 35 USC 112(f) unless the element or concept is expressly recited using the phrase “means for” or “step for”.In view of the many possible embodiments to which the disclosed principles can be applied, we reserve the right to claim any and all combinations of features and acts described herein, including the right to claim all that comes within the scope and spirit of the foregoing description, as well as the combinations recited, literally and equivalently, in the following claims and any claims presented anytime throughout prosecution of this application or any application claiming benefit of or priority from this application.