50G Combo PON optical assembly

Abstract

The utility model relates to a 50G Combo PON (Passive Optical Network) optical assembly. The BOX mainly comprises a BOX shell 1, and a first transmitting light path, a second transmitting light path, a third transmitting light path, a first receiving light path, a second receiving light path and a third receiving light path which are arranged in the BOX shell 1, wherein the first transmitting light path, the second transmitting light path and the third transmitting light path are arranged in a first space 101 of the BOX shell 1, and the first receiving light path, the second receiving light path and the third receiving light path are arranged in a second space 102 of the BOX shell 1. The first space 101 and the second space 102 are isolated through an isolation baffle 36. Light paths at transmitting and receiving ends can be isolated, and the purpose of reducing photoelectric crosstalk is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical communication technical field especially relates to a 50G Combo PON optical assembly. BACKGROUND

[0002] With video service becoming the basic service of broadband network, and passive optical network (PON) technology gradually expanding from the field of home broadband to the field of government and enterprise industry, such as remote medical treatment, industrial intelligent manufacturing, on the one hand, higher demand for bandwidth is put forward, on the other hand, time delay, packet loss, jitter, service quality and user experience are also put forward corresponding requirements. For example, virtual reality (VR) service, to achieve very good user experience, its bandwidth requirement is more than 1Gbit / s, round-trip time (RTT) is not more than 5ms; for example, remote medical treatment, its requirement of end-to-end communication time delay is less than 50ms, and jitter is less than 200us.

[0003] With the rapid development of fiber to the home (FTTH) network technology, GPON (Gigabit-capable Passive Optical Network) has become the standard choice of most global operators. However, with the increasing demand of users for higher bandwidth, symmetric rate and lower delay, XG(S)-PON (10G Passive Optical Network) as the next generation of fiber access technology gradually attracts attention. Under this background, Combo PON technology emerges as the times require, which efficiently integrates GPON and XG(S)-PON network technology, helping operators to meet existing demand while smoothly transitioning to higher performance networks. Combo PON is a solution that combines GPON and XG(S)-PON network technology, supporting both to run on the same optical distribution network (ODN). Traditional GPON technology provides downlink 2.5Gbps and uplink 1.25Gbps bandwidth, while XG(S)-PON can provide symmetric 10Gbps rate. The core advantage of Combo PON technology is that it can transmit these two technologies through the same optical fiber without introducing external coexistence modules, thus greatly simplifying the network structure.

[0004] Compared with 10G PON, 50G Combo PON will bring 5 times bandwidth improvement, with low latency, low jitter, high reliability and other characteristics, through bandwidth exchange time delay, bandwidth conversion force, it can provide extreme service experience, and promote more new applications and new services, better meet the typical application requirements of the gigabit era of digital life, digital transformation of industry and urban digital infrastructure and other fields.

[0005] However, the existing 50G Combo PON optical assembly still has some defects that need to be improved, for example, in the optical path design of the existing 50G Combo PON optical assembly, the isolation of the optical path of the transmitting and receiving ends is not good or even not isolated, which is easy to cause photoelectric crosstalk, and then affect the use effect.

[0006] Therefore, how to overcome the defects of the prior art, how to effectively isolate the transmitting and receiving ends of the 50G Combo PON optical assembly to reduce photoelectric crosstalk is a problem to be solved in the technical field. Practical new type content

[0007] In view of the defects or improvement needs of the prior art: how to effectively isolate the transmitting and receiving ends of the 50G Combo PON optical assembly to reduce photoelectric crosstalk. The utility model provides a kind of 50G Combo PON optical assembly, isolation baffle is arranged between transmitting optical path and receiving optical path, and then the transmitting and receiving ends of optical path can be isolated, to achieve the purpose of reducing photoelectric crosstalk.

[0008] The utility model adopts the following technical scheme:

[0009] The utility model provides a kind of 50G Combo PON optical assembly, including BOX shell 1 and the first sending optical path, second sending optical path, third sending optical path, first receiving optical path, second receiving optical path and third receiving optical path being arranged in the BOX shell 1;Wherein:

[0010] The first sending optical path, the second sending optical path and the third sending optical path are arranged in the first space 101 of the BOX shell 1, the first receiving optical path, the second receiving optical path and the third receiving optical path are arranged in the second space 102 of the BOX shell 1, and the first space 101 and the second space 102 are isolated by isolation baffle 36.

[0011] In some embodiments, the first sending optical path includes first laser 3, first collimating lens 4, first optical isolator 5, second filter 6, third filter 11, fourth filter 12, fifth filter 15, first filter 16 and C lens 17;Wherein:

[0012] The laser emitted by the first laser 3 is collimated by the first collimating lens 4, passes through the first optical isolator 5, is reflected by the second filter 6, the third filter 11, the fourth filter 12 and the fifth filter 15 in turn, passes through the first filter 16, and is converged by the C lens 17 into the external single-mode fiber adapter 19.

[0013] In some embodiments, the second sending light path comprises a second laser 8, a second collimating lens 9, a second optical isolator 10, a third filter 11, a fourth filter 12, a fifth filter 15, a first filter 16 and a C lens 17; wherein:

[0014] The laser emitted by the second laser 8 is collimated by the second collimating lens 9, passes through the second optical isolator 10 and the third filter 11 in turn, is reflected by the fourth filter 12 and the fifth filter 15 in turn, passes through the first filter 16, and is converged by the C lens 17 into the external single-mode fiber adapter 19.

[0015] In some embodiments, the third sending light path comprises a third laser 13, a third collimating lens 14, a fifth filter 15, a first filter 16 and a C lens 17; wherein:

[0016] The laser emitted by the third laser 13 is collimated by the third collimating lens 14, passes through the fifth filter 15 and the first filter 16 in turn, and is converged by the C lens 17 into the external single-mode fiber adapter 19.

[0017] In some embodiments, a thermistor 7 is arranged between the second laser 8 and the first laser 3, the second laser 8, the first laser 3 and the thermistor 7 are fixed on the cold side of a TEC 2, the TEC 2 is fixed in the first space 101 of the BOX shell 1, a tube ceramic circuit 39 is arranged at the tail of the BOX shell 1, the second laser 8, the first laser 3, the thermistor 7 and the TEC 2 are connected to the tube ceramic circuit 39 through gold wire, and a plurality of first glass insulators 37 are arranged on one side of the third laser 13, and the third laser 13 is connected to the first glass insulators 37 through gold wire.

[0018] In some embodiments, the first receiving light path comprises a C lens 17, a first filter 16, a sixth filter 25, a seventh filter 24, a first converging lens 23 and a first detector 22; wherein:

[0019] The external light signal enters the optical assembly through the single-mode fiber adapter 19, is back collimated by the C lens 17, is reflected by the first filter 16 and the sixth filter 25 in turn, is transmitted through the seventh filter 24, and reaches the first detector 22 through the first converging lens 23 to perform photoelectric conversion.

[0020] In some embodiments, the second receiving light path comprises the C lens 17, the first filter 16, the sixth filter 25, the seventh filter 24, the eighth filter 31, the second converging lens 28, and the second detector 30.

[0021] The external light signal enters the optical assembly through the single-mode fiber adapter 19, is back collimated by the C lens 17, is reflected by the first filter 16, the sixth filter 25, the seventh filter 24, and the eighth filter 31 in turn, and reaches the second detector 30 through the second converging lens 28 to perform photoelectric conversion.

[0022] In some embodiments, the third receiving light path comprises the C lens 17, the first filter 16, the sixth filter 25, the seventh filter 24, the eighth filter 31, the third converging lens 32, and the third detector 33.

[0023] The external light signal enters the optical assembly through the single-mode fiber adapter 19, is back collimated by the C lens 17, is reflected by the first filter 16, the sixth filter 25, and the seventh filter 24 in turn, is transmitted through the eighth filter 31, and reaches the third detector 33 through the third converging lens 32 to perform photoelectric conversion.

[0024] In some embodiments, the first TIA 20 and the first capacitor 21 are arranged around the first detector 22, the second capacitor 26, the second TIA 27, and the third capacitor 29 are arranged around the second detector 30, and the third TIA 34, the fourth capacitor 35, and a plurality of second glass insulators 38 are arranged around the third detector 33; the BOX shell 1 is provided with a tube ceramic circuit 39 at the tail thereof, and the first TIA 20, the second TIA 27, the first capacitor 21, the second capacitor 26, and the third capacitor 29 are connected to the tube ceramic circuit 39 through gold wire leads; the third TIA 34 and the fourth capacitor 35 are connected to the second glass insulator 38 through gold wire leads.

[0025] In some embodiments, the BOX shell 1 is provided with a light window 40 at the optical port thereof, the BOX shell 1 is provided with an optical port adjusting ring 18 outside the optical port thereof, and a cover plate 41 is welded on the BOX shell 1.

[0026] Compared with the prior art, the 50G Combo PON optical assembly has the beneficial effects that: the isolation baffle is arranged between the transmitting optical path and the receiving optical path, thereby the transmitting and receiving optical paths can be isolated, and the purpose of reducing photoelectric crosstalk is achieved.

[0027] Further, the receiving and transmitting ends adopt the coupling mode of lens and filter joint debugging, the dependence of optical coupling on the machining precision of the shell structure is reduced, the maximum optical coupling efficiency is ensured, three transmitting and three receiving mixed integration is realized in a BOX (box) shell, the packaging appearance size can meet the requirements of a small form-factor pluggable (SFP) +, the receiving and transmitting end lenses and the receiving and transmitting end filters can share the same clamping jig, and batch production is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly introduced as follows. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor.

[0029] Figure 1 The internal structure schematic diagram of the 50G Combo PON optical assembly provided by the embodiments of the present application is shown in the figure.

[0030] Figure 2 The structure schematic diagram of the receiving end convergence lens provided by the embodiments of the present application is shown in the figure.

[0031] Figure 3 The cover structure schematic diagram provided by the embodiments of the present application is shown in the figure.

[0032] Figure 4 The transmitting optical path schematic diagram of the first laser and the second laser provided by the embodiments of the present application is shown in the figure.

[0033] Figure 5 The transmitting optical path schematic diagram of the third laser provided by the embodiments of the present application is shown in the figure.

[0034] Figure 6 The three-way receiving optical path schematic diagram provided by the embodiments of the present application is shown in the figure.

[0035] In the figure: 1-BOX housing; 101-first space; 102-second space; 2-TEC; 3-first laser; 4-first collimating lens; 5-first optical isolator; 6-second filter; 7-thermistor; 8-second laser; 9-second collimating lens; 10-second optical isolator; 11-third filter; 12-fourth filter; 13-third laser; 14-third collimating lens; 15-fifth filter; 16-first filter; 17-C lens; 18-optical port adjusting ring; 19-single mode fiber adapter; 20-first TIA; 21-first capacitor; 22-first detector; 23-first converging lens; 24-seventh filter; 25-sixth filter; 26-second capacitor; 27-second TIA; 28-second converging lens; 29-third capacitor; 30-second detector; 31-eighth filter; 32-third converging lens; 33-third detector; 34-third TIA; 35-fourth capacitor; 36-isolation baffle; 37-first glass insulator; 38-second glass insulator; 39-tube shell ceramic circuit; 40-optical window; 41-cover plate. DETAILED DESCRIPTION

[0036] In the description of the present application, the terms "inner", "outer", "longitudinal", "transverse", "upper", "lower", "left", "right", "top", "bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and do not require the present application to be constructed and operated in a particular orientation, therefore should not be understood as a limitation of the present application.

[0037] The present application will be described in detail below with specific embodiments. The following embodiments will help those skilled in the art to further understand the present application, but do not limit the present application in any form. It should be pointed out that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made. These are within the scope of protection of the present application.

[0038] It should be noted that the various features of the embodiments of the present application can be combined with each other without conflict, and are within the scope of protection of the present application. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as understood by those skilled in the art of the technology to which the present application belongs. The terms and orientation descriptions used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, and are not intended to limit the present application.

[0039] Unless the context clearly requires otherwise, throughout the description and the claims, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers. In description of the specification, the terms "one embodiment", "some embodiments", "an example embodiment", "an example", "a specific example" or "some examples" are intended to mean that a particular feature, structure, material, or characteristic is included in at least one embodiment or example of the present disclosure. These terms are not necessarily intended to indicate a single or same embodiment or example. Furthermore, these terms can be used to describe particular features, structures, materials, or characteristics that are included in, or can be used in, any one or more embodiments or examples, i.e., although the features, structures, materials, or characteristics can be carried out in embodiments or examples, they are not necessarily carried out in combination with each other in an embodiment or example.

[0040] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and not to limit the utility model.

[0041] Embodiment 1

[0042] As Figure 1 shown, the utility model embodiment provides a kind of 50G Combo PON optical assembly, including BOX shell 1 and the first sending optical path, second sending optical path, third sending optical path, first receiving optical path, second receiving optical path and third receiving optical path being arranged in the BOX shell 1;Wherein: the first sending optical path, the second sending optical path and the third sending optical path are arranged in the first space 101 of the BOX shell 1, the first receiving optical path, the second receiving optical path and the third receiving optical path are arranged in the second space 102 of the BOX shell 1, the first space 101 is isolated with the second space 102 by isolation baffle 36.It is isolated to receive and send two ends optical path by the above-mentioned arrangement, isolation baffle 36 is arranged between sending optical path and receiving optical path, to achieve the purpose of reducing photoelectric cross talk.

[0043] In some embodiments, isolation baffle 36 is special-shaped isolation baffle, referring to Figure 1 It includes front and back two straight plates and the arc inclined plate connecting front and back two straight plates, the special-shaped isolation baffle is first space 101 above, and second space 102 below;Special-shaped isolation baffle left side separates completely up and down, but right side has gap, to make the sending optical path above and the receiving optical path below can share a part of device.

[0044] Referring to Figure 1 and Figure 4As shown, in some embodiments, the first transmitting light path comprises a first laser 3, a first collimating lens 4, a first optical isolator 5, a second filter 6, a third filter 11, a fourth filter 12, a fifth filter 15, a first filter 16, and a C lens 17; wherein: the laser emitted by the first laser 3 is collimated by the first collimating lens 4, then passes through the first optical isolator 5, and then is reflected by the second filter 6, the third filter 11, the fourth filter 12, and the fifth filter 15 in turn, then passes through the first filter 16, and then is converged by the C lens 17 into an external single-mode fiber adapter 19.

[0045] Referring to Figure 1 and Figure 4 As shown, in some embodiments, the second transmitting light path comprises a second laser 8, a second collimating lens 9, a second optical isolator 10, a third filter 11, a fourth filter 12, a fifth filter 15, a first filter 16, and a C lens 17; wherein: the laser emitted by the second laser 8 is collimated by the second collimating lens 9, then passes through the second optical isolator 10 and the third filter 11 in turn, then is reflected by the fourth filter 12 and the fifth filter 15 in turn, then passes through the first filter 16, and then is converged by the C lens 17 into an external single-mode fiber adapter 19.

[0046] Referring to Figure 1 and Figure 5 As shown, in some embodiments, the third transmitting light path comprises a third laser 13, a third collimating lens 14, a fifth filter 15, a first filter 16, and a C lens 17; wherein: the laser emitted by the third laser 13 is collimated by the third collimating lens 14, then passes through the fifth filter 15 and the first filter 16 in turn, and then is converged by the C lens 17 into an external single-mode fiber adapter 19.

[0047] In some embodiments, some devices are shared by the three transmitting light paths, for example, the fifth filter 15, the first filter 16, and the C lens 17 are shared by the three transmitting light paths, and the third filter 11 and the fourth filter 12 are shared by the first transmitting light path and the second transmitting light path.

[0048] Referring to Figure 1As shown in some embodiments, a thermistor 7 is arranged between the second laser 8 and the first laser 3, the second laser 8, the first laser 3 and the thermistor 7 are fixed on the cold face of a thermal electronic cooler (TEC) 2, the TEC 2 is fixed in the first space 101 of the BOX shell 1; the BOX shell 1 tail is provided with a tube ceramic circuit 39, the second laser 8, the first laser 3, the thermistor 7 and the TEC 2 are connected with the tube ceramic circuit 39 through gold wire; the third laser 13 is provided with a plurality of first glass insulators 37 on one side, and the third laser 13 is connected with the first glass insulator 37 through gold wire.

[0049] Referring to Figure 1 and Figure 6 As shown in some embodiments, the first receiving light path includes a C lens 17, a first filter 16, a sixth filter 25, a seventh filter 24, a first converging lens 23 and a first detector 22; wherein: the external optical signal enters the optical assembly through a single-mode fiber adapter 19, is back collimated through the C lens 17, is reflected in turn through the first filter 16 and the sixth filter 25, is transmitted through the seventh filter 24, reaches the first detector 22 through the first converging lens 23, and is photoelectrically converted.

[0050] Referring to Figure 1 and Figure 6 As shown in some embodiments, the second receiving light path includes a C lens 17, a first filter 16, a sixth filter 25, a seventh filter 24, an eighth filter 31, a second converging lens 28 and a second detector 30; wherein: the external optical signal enters the optical assembly through a single-mode fiber adapter 19, is back collimated through the C lens 17, is reflected in turn through the first filter 16, the sixth filter 25, the seventh filter 24 and the eighth filter 31, and reaches the second detector 30 through the second converging lens 28, and is photoelectrically converted.

[0051] Referring to Figure 1 and Figure 6As shown, in some embodiments, the third receiving light path comprises a C lens 17, a first filter 16, a sixth filter 25, a seventh filter 24, an eighth filter 31, a third converging lens 32, and a third detector 33; wherein: an external optical signal enters the optical assembly through a single-mode fiber adapter 19, is reverse-collimated by the C lens 17, is reflected by the first filter 16, the sixth filter 25, and the seventh filter 24 in turn, and then passes through the eighth filter 31, reaches the third converging lens 32, and reaches the third detector 33 for photoelectric conversion.

[0052] In some embodiments, some devices are shared by the three receiving light paths, for example, the C lens 17, the first filter 16, the sixth filter 25, and the seventh filter 24 are shared by the three receiving light paths, and the eighth filter 31 is shared by the second receiving light path and the third receiving light path.

[0053] Reference Figure 2 As shown, in some embodiments, the first converging lens 23, the second converging lens 28, and the third converging lens 32 are the same plano-convex silicon lens, and the convex surface is aspherical.

[0054] Reference Figure 1 As shown, in some embodiments, the first detector 22 is surrounded by a first trans-impedance amplifier (TIA) 20 and a first capacitor 21, the second detector 30 is surrounded by a second capacitor 26, a second TIA 27, and a third capacitor 29, and the third detector 33 is surrounded by a third TIA 34, a fourth capacitor 35, and a plurality of second glass insulators 38; the BOX housing 1 tail is provided with a tube ceramic circuit 39, and the first TIA 20, the second TIA 27, the first capacitor 21, the second capacitor 26, and the third capacitor 29 are connected to the tube ceramic circuit 39 through gold wire leads; the third TIA 34 and the fourth capacitor 35 are connected to the second glass insulator 38 through gold wire leads.

[0055] Reference Figure 1 As shown, in some embodiments, the BOX housing 1 optical port is provided with an optical window 40, the outside of the BOX housing 1 optical port is provided with an optical port adjusting ring 18, and the BOX housing 1 is welded with a cover plate 41. Reference Figure 4 As shown, in some embodiments, the cover plate 41 is welded with the BOX housing 1 by parallel sealing welding.

[0056] In some embodiments, the first laser 3, the second laser 8 and the third laser 13 are respectively a 1577nm laser, a 1342nm laser and a 1490nm laser; the first detector 22, the second detector 30 and the third detector 33 are respectively a 1286nm detector, a 1270nm detector and a 1310nm detector; the transmitting light path of the lasers and the receiving light path of the detectors share the first filter 16 (32-degree filter), which can pass the light beams of 1575nm-1580nm and 1340nm-1344nm and 1480nm-1500nm, and reflect the light beams of 1260nm-1330nm; four 13-degree filters are arranged in the three light paths of the lasers, wherein the second filter 6 (13-degree filter) can reflect the light beams of 1575nm-1580nm, the third filter 11 (13-degree filter) can pass the light beams of 1340nm-1344nm and reflect the light beams of 1575nm-1580nm, the fourth filter 12 (13-degree filter) can reflect the light beams of 1575nm-1580nm and 1340nm-1344nm, and the fifth filter 15 (13-degree filter) can pass the light beams of 1480nm-1500nm and reflect the light beams of 1575nm-1580nm and 1340nm-1344nm; one sixth filter 25 (32-degree filter), one seventh filter 24 (8-degree filter) and one eighth filter 31 (13-degree filter) are arranged in the three light paths of the detectors, wherein the sixth filter 25 can reflect the light beams of 1260nm-1330nm, the seventh filter 24 can pass the light beams of 1284nm-1288nm and reflect the light beams of 1260nm-1280nm and 1290nm-1580nm, and the eighth filter 31 can pass the light beams of 1290nm-1330nm and reflect the light beams of 1260nm-1280nm.

[0057] The light emitted by the 1577nm laser (the first laser 3) passes through the first collimating lens 4, the first optical isolator 5, the second filter 6, the third filter 11, the fourth filter 12 and the fifth filter 15; the light emitted by the 1342nm laser (the second laser 8) passes through the second collimating lens 9, the second optical isolator 10 and the third filter 11, and then passes through the fourth filter 12 and the fifth filter 15; the light emitted by the 1490nm laser (the third laser 13) passes through the third collimating lens 14 and the fifth filter 15. The three light paths are combined and then pass through the first filter 16, and the light is converged by the C lens 17 and then enters the single-mode fiber adapter 19.

[0058] The 1286nm receiving light input from the single-mode fiber adapter 19 ferrule is collimated into parallel light by the C lens 17, reflected by the first filter 16 and the sixth filter 25, and then transmitted through the seventh filter 24 and the first converging lens 23, and received by the 1286nm detector (the first detector 22); the 1270nm receiving light input from the single-mode fiber adapter 19 ferrule is collimated into parallel light by the C lens 17, reflected by the first filter 16, the sixth filter 25, the seventh filter 24 and the eighth filter 31, and then transmitted through the second converging lens 28, and received by the 1270nm detector (the second detector 30); the 1310nm receiving light input from the single-mode fiber adapter 19 ferrule is collimated into parallel light by the C lens 17, reflected by the first filter 16, the sixth filter 25 and the seventh filter 24, and then transmitted through the eighth filter 31 and the third converging lens 32, and received by the 1310nm detector (the third detector 33).

[0059] In this embodiment, the profiled isolation baffle is arranged between the transmitting end and the receiving end to reduce the crosstalk of the optical paths of the transmitting end and the receiving end. In addition, the light-absorbing material is arranged inside the cover plate 41 of the cover.

[0060] In this embodiment, the overall three-transmitting and three-receiving optical paths are compressed to reduce the size of the optical assembly to meet the requirement of miniaturization of the optical module.

[0061] In this embodiment, all the elements are arranged in the same BOX and the same plane to facilitate the automation of die bonding and wire bonding. In addition, the transmitting-end collimating lens and the receiving-end converging lens have the same width, and the filters have the same thickness, which facilitates the design of the general clamping fixture of the automatic coupling equipment. Furthermore, the coupling mode of the lens and the filter is adopted for the transmitting end and the receiving end to ensure the maximum coupling efficiency of the optical path.

[0062] In this embodiment, the ceramic circuit is arranged at the tail of the BOX tube shell to ensure the radio frequency performance of the transmitting end and the receiving end at a rate of 10G or above. The chips of the channel at a rate of 10G or above are connected to the flexible soft plate of the optical module through the tube shell ceramic circuit 39.

[0063] In summary, the utility model discloses a 50G Combo PON optical assembly adopts brand -new optical path design, and the optical path of two ends of isolation transceiver reduces photoelectric crosstalk, further, still can simplify optical path structure, reduce the dependence of optical path coupling on the machining precision of shell structure, improve optical path coupling efficiency, further, still three send three receive mixed integration in a BOX shell, and the package appearance size can satisfy the requirement of SFP+, further, the lens of receiving end and transmitting end and the filter of receiving end and transmitting end can share same clamping fixture, be favorable to mass production.

[0064] Embodiment 2

[0065] Based on the above 50G Combo PON optical assembly, the packaging method of the 50G Combo PON optical assembly is described in more detail in this embodiment.

[0066] In some embodiments, the TEC 2 is bonded in the designated area of the BOX by high-thermal-conductivity glue, and the shear force meets the industry requirements. The three lasers of different wavelengths are a 1342nm laser (the second laser 8), a 1577nm laser (the first laser 3) and a 1490nm laser (the third laser 13), wherein the 1342nm laser adopts an external modulated laser (EML) chip of an integrated semiconductor optical amplifier (SOA), the 1577nm laser adopts an EML chip, and the 1490nm laser adopts a distributed feedback laser (DFB) chip. The first laser 3 of 1577nm, the second laser 8 of 1342nm and the thermistor 7 are fixed on the cold face of the TEC 2 by high-thermal-conductivity glue, and the shear force meets the industry requirements. The third laser 13 of 1490nm, the first TIA 20, the second TIA 27, the third TIA 34, the first detector 22 of 1286nm, the second detector 30 of 1270nm, the third detector 33 of 1310nm, the first capacitor 21, the second capacitor 26, the third capacitor 29 and the fourth capacitor 35 are fixed in the designated area of the BOX by the same conductive silver glue, and the shear force meets the industry requirements.

[0067] In some embodiments, the BOX shell 1 tail of the tube shell is provided with a tube shell ceramic circuit 39, a first laser 3 of 1577 nm, a second laser 8 of 1342 nm, a thermistor 7, a TEC 2, a first TIA 20, a second TIA 27, a first capacitor 21, a second capacitor 26, a third capacitor 29 are connected to the tube shell ceramic circuit 39 through gold wire; a first glass insulator 37 is arranged beside the third laser 13 of 1490 nm, and the third laser 13 of 1490 nm is connected to the first glass insulator 37 through gold wire; a second glass insulator 38 is arranged near the third TIA 34, and the third TIA 34 and the fourth capacitor 35 are connected to the second glass insulator 38 through gold wire.

[0068] In some embodiments, the first optical isolator 5 and the second optical isolator 10 are fixed on the right side of the first laser 3 of 1577 nm and the second laser 8 of 1342 nm respectively through high-reliability epoxy resin glue, and the shear force meets the industry requirement, so that the laser beam is in the center of the light aperture of the optical isolator.

[0069] In some embodiments, the C lens 17 is fixed inside the tube shell light port through high-reliability epoxy resin glue, and the shear force meets the industry requirement; the third filter 11 of 13 degrees, the fifth filter 15 of 13 degrees, and the first filter 16 of 32 degrees are fixed in the specified area of the BOX through high-reliability epoxy resin glue, and the three filters can be passively attached through automatic patching equipment.

[0070] In some embodiments, the light port adjusting ring 18 and the single-mode fiber adapter 19 are fixed with the BOX shell 1 using laser welding, and the welding shear force, pull-off force and reliability meet the industry requirements.

[0071] In some embodiments, the second filter 6 of 13 degrees is arranged at an angle of 77 degrees with the light emitting bar of the first laser 3 of 1577 nm; the second filter 6 of 13 degrees is arranged in parallel with the third filter 11 of 13 degrees, the fourth filter 12 of 13 degrees, and the fifth filter 15 of 13 degrees; the first filter 16 of 32 degrees is arranged at an angle of 122 degrees with the light emitting bar of the first laser 3 of 1577 nm, and the sixth filter 25 of 32 degrees is arranged in parallel with the first filter 16 of 32 degrees; the seventh filter 24 of 8 degrees is arranged at an angle of 98 degrees with the light emitting bar of the first laser 3 of 1577 nm; and the eighth filter 31 of 13 degrees is arranged at an angle of 93 degrees with the light emitting bar of the first laser 3 of 1577 nm.

[0072] In some embodiments, the laser emitted by the first laser 3 at 1577 nm is collimated by the first collimating lens 4, then passes through the first optical isolator 5, and then is reflected by the 13-degree second filter 6, the 13-degree third filter 11, the 13-degree fourth filter 12, and the 13-degree fifth filter 15 in sequence, and then passes through the 32-degree first filter 16, and the collimated light is converged by the C lens 17 into the single-mode fiber adapter 19. The laser emitted by the second laser 8 at 1342 nm is collimated by the second collimating lens 9, then passes through the second optical isolator 10 and the 13-degree third filter 11 in sequence, and then is reflected by the 13-degree fourth filter 12 and the 13-degree fifth filter 15 in sequence, and then passes through the 32-degree first filter 16, and the collimated light is converged by the C lens 17 into the single-mode fiber adapter 19. The laser emitted by the third laser 13 at 1490 nm is collimated by the third collimating lens 14, and then passes through the 13-degree fifth filter 15 and the 32-degree first filter 16 in sequence, and the collimated light is converged by the C lens 17 into the single-mode fiber adapter 19.

[0073] In some embodiments, first, the second collimating lens 9 is coupled with the 13-degree fourth filter 12 for adjustment, and the two are fixed by high-reliability epoxy resin glue; then, the first collimating lens 4 is coupled with the 13-degree second filter 6 for adjustment, and the two are fixed by high-reliability epoxy resin glue; finally, the third collimating lens 14 is fixed by high-reliability epoxy resin glue.

[0074] In some embodiments, the first collimating lens 4, the second collimating lens 9, and the third collimating lens 14 are the same plano-convex silicon lens, the convex surface is aspherical, the radius of curvature (ROC) is 0.73, and the conic parameter is -2.74.

[0075] In some embodiments, the three different wavelength detectors are respectively a first detector 22 of 1286nm, a third detector 33 of 1310nm and a second detector 30 of 1270nm, all of which are Avalanche Photo Diode (APD) detectors. After the external Wavelength Division Multiplexing (WDM) optical signal enters the optical assembly through the single-mode fiber adapter 19, the 1286nm wavelength light beam is reflected by the 32-degree first filter 16 and the 32-degree sixth filter 25 in turn, passes through the 8-degree seventh filter 24, and reaches the 1286nm first detector 22 through the first converging lens 23 for photoelectric conversion; the 1270nm wavelength light beam is reflected by the 32-degree first filter 16, the 32-degree sixth filter 25, the 8-degree seventh filter 24 and the 13-degree eighth filter 31 in turn, and then reaches the 1270nm second detector 30 through the second converging lens 28 for photoelectric conversion; the 1310nm wavelength light beam is reflected by the 32-degree first filter 16 and the 32-degree sixth filter 25, and then passes through the 8-degree seventh filter 24 and the 13-degree eighth filter 31, and reaches the 1310nm third detector 33 through the third converging lens 32 for photoelectric conversion.

[0076] In some embodiments, the first converging lens 23, the second converging lens 28 and the third converging lens 32 are the same plano-convex silicon lens, the convex surface is aspherical, ROC=1.43, and the Conic parameter is -2.81.

[0077] In some embodiments, first, the 32-degree sixth filter 25 is coupled with the first converging lens 23 for adjustment, and is fixed by high-reliability epoxy resin glue; then, the 8-degree seventh filter 24 is coupled with the third converging lens 32 for adjustment, and is fixed by high-reliability epoxy resin glue; finally, the 13-degree eighth filter 31 is coupled with the second converging lens 28 for adjustment, and is fixed by high-reliability epoxy resin glue.

[0078] In some embodiments, after all the optical path couplings are completed, the special-shaped isolation baffle 36 is fixed in the specified direction in the BOX by high-reliability epoxy resin glue.

[0079] In some embodiments, the optical window 40 of sapphire material is used to seal the BOX optical port, and the air tightness meets the industry requirements.

[0080] In some embodiments, the cover plate 41 is welded with the BOX shell 1 by parallel sealing welding, and the air tightness meets the industry standards.

[0081] In summary, the utility model provides a kind of 50G Combo PON optical assembly, adopt brand-new optical path design, isolate the light path of two ends of receiving and transmitting, reduce photoelectric crosstalk;Further, receiving and transmitting end all adopt the coupling mode of lens and optical filter joint debugging, reduce the dependence of optical path coupling on shell structure machining precision, ensure maximum optical path coupling efficiency;Further, three transmitters and three receivers are mixed and integrated in a BOX shell, and the package size can meet the requirements of SFP+;Further, receiving and transmitting end lens and receiving and transmitting end optical filter can share the same clamping jig, which is beneficial to mass production.

[0082] The above only describes preferred embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model.The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A 50G Combo PON optical component, characterized in that, Includes a BOX housing (1) and a first transmitting optical path, a second transmitting optical path, a third transmitting optical path, a first receiving optical path, a second receiving optical path, and a third receiving optical path disposed within the BOX housing (1); wherein: The first transmitting optical path, the second transmitting optical path, and the third transmitting optical path are disposed in the first space (101) of the BOX housing (1), and the first receiving optical path, the second receiving optical path, and the third receiving optical path are disposed in the second space (102) of the BOX housing (1). The first space (101) and the second space (102) are isolated by an isolation baffle (36).

2. The 50G Combo PON optical component according to claim 1, characterized in that, The first transmitting optical path includes a first laser (3), a first collimating lens (4), a first optical isolator (5), a second filter (6), a third filter (11), a fourth filter (12), a fifth filter (15), a first filter (16), and a C-lens (17); wherein: The laser emitted by the first laser (3) is collimated by the first collimating lens (4), passes through the first optical isolator (5), and is reflected by the second filter (6), the third filter (11), the fourth filter (12) and the fifth filter (15) in sequence. After passing through the first filter (16), it is focused by the C lens (17) into the external single-mode fiber optic adapter (19).

3. The 50G Combo PON optical component according to claim 2, characterized in that, The second transmitting optical path includes a second laser (8), a second collimating lens (9), a second optical isolator (10), a third filter (11), a fourth filter (12), a fifth filter (15), a first filter (16), and a C-lens (17); wherein: The laser emitted by the second laser (8) is collimated by the second collimating lens (9), then passes through the second optical isolator (10) and the third filter (11) in sequence, and is reflected by the fourth filter (12) and the fifth filter (15) in sequence, and then passes through the first filter (16) and is focused into the external single-mode fiber optic adapter (19) by the C lens (17).

4. The 50G Combo PON optical component according to claim 3, characterized in that, The third optical transmission path includes a third laser (13), a third collimating lens (14), a fifth filter (15), a first filter (16), and a C-lens (17); wherein: The laser emitted by the third laser (13) is collimated by the third collimating lens (14), and then passes through the fifth filter (15) and the first filter (16) in sequence, and is focused by the C lens (17) into the external single-mode fiber optic adapter (19).

5. The 50G Combo PON optical component according to claim 4, characterized in that, A thermistor (7) is provided between the second laser (8) and the first laser (3). The second laser (8), the first laser (3) and the thermistor (7) are fixed on the cold side of the TEC (2). The TEC (2) is fixed in the first space (101) of the BOX housing (1). A tube-shell ceramic circuit (39) is provided at the tail of the BOX housing (1). The second laser (8), the first laser (3), the thermistor (7) and the TEC (2) are connected to the tube-shell ceramic circuit (39) through gold wires. A plurality of first glass insulators (37) are provided on one side of the third laser (13). The third laser (13) is connected to the first glass insulators (37) through gold wires.

6. The 50G Combo PON optical component according to claim 1, characterized in that, The first receiving optical path includes a C-lens (17), a first filter (16), a sixth filter (25), a seventh filter (24), a first converging lens (23), and a first detector (22); wherein: External optical signals enter the optical component through a single-mode fiber optic adapter (19), are collimated by the C lens (17), and are reflected by the first filter (16) and the sixth filter (25) in sequence. They then pass through the seventh filter (24), and reach the first detector (22) through the first converging lens (23) for photoelectric conversion.

7. The 50G Combo PON optical component according to claim 6, characterized in that, The second receiving optical path includes a C-lens (17), a first filter (16), a sixth filter (25), a seventh filter (24), an eighth filter (31), a second converging lens (28), and a second detector (30); wherein: External optical signals enter the optical component through a single-mode fiber optic adapter (19), are collimated by the C lens (17), and are reflected sequentially by the first filter (16), the sixth filter (25), the seventh filter (24) and the eighth filter (31), and then reach the second detector (30) through the second converging lens (28) for photoelectric conversion.

8. The 50G Combo PON optical component according to claim 7, characterized in that, The third receiving optical path includes a C-lens (17), a first filter (16), a sixth filter (25), a seventh filter (24), an eighth filter (31), a third converging lens (32), and a third detector (33); wherein: External optical signals enter the optical component through a single-mode fiber optic adapter (19), are collimated by the C lens (17), and are reflected sequentially by the first filter (16), the sixth filter (25), and the seventh filter (24), and then pass through the eighth filter (31), and reach the third detector (33) through the third converging lens (32) for photoelectric conversion.

9. The 50G Combo PON optical component according to claim 8, characterized in that, The first detector (22) is surrounded by a first TIA (20) and a first capacitor (21). The second detector (30) is surrounded by a second capacitor (26), a second TIA (27), and a third capacitor (29). The third detector (33) is surrounded by a third TIA (34), a fourth capacitor (35), and several second glass insulators (38). The tail of the BOX housing (1) is provided with a tube-shell ceramic circuit (39). The first TIA (20), the second TIA (27), the first capacitor (21), the second capacitor (26), and the third capacitor (29) are connected to the tube-shell ceramic circuit (39) through gold wires. The third TIA (34) and the fourth capacitor (35) are connected to the second glass insulators (38) through gold wires.

10. The 50G Combo PON optical component according to any one of claims 1-9, characterized in that, The BOX housing (1) has a light window (40) at the light port, a light port adjustment ring (18) is provided on the outside of the light port of the BOX housing (1), and a cover plate (41) is welded on the BOX housing (1).

Images