CN113917634A

CN113917634A - Novel three-emitting three-receiving single-fiber six-direction optical device and packaging process

Info

Publication number: CN113917634A
Application number: CN202111268525.XA
Authority: CN
Inventors: 王宏超; 李永强; 张帅
Original assignee: Sunstar Communication Technology Co ltd
Current assignee: Sunstar Communication Technology Co ltd
Priority date: 2021-10-28
Filing date: 2021-10-28
Publication date: 2022-01-11

Abstract

The invention discloses a novel three-transmitting three-receiving single-fiber six-direction optical device and a packaging process, wherein the optical device comprises a shell, three lasers, two detectors and a passive adapter component, wherein the three lasers, the two detectors and the passive adapter component are fixed on the shell, the three lasers are respectively a 10G laser TO-CAN, a 2.5G laser TO-CAN and a 25G DFB laser, and the three lasers share one isolator; the two detectors are respectively a 25G PIN-TIA detector and a double-rate APD-TIA detector TO-CAN; a 15-degree light splitting sheet is arranged in the collimation light path; three 15 ° splitters and a 30 ° reflective slide were placed at the detector end. Compared with the prior art, the invention has the following positive effects: the 5G service deployment cost can be effectively reduced, the internal loss of an optical device is reduced, and the overall dimension of the product is more miniaturized.

Description

Novel three-emitting three-receiving single-fiber six-direction optical device and packaging process

Technical Field

The invention relates to a novel three-emitting three-receiving single-fiber six-direction optical device and a packaging process.

Background

With the acceleration of 5G deployment, how to build 5G networks in a cost-effective manner has become a hot topic. In this case, sharing the rich infrastructure of FTTx networks may be another option for operators in the age of 5G. On the one hand, since the Sub-6GHz band is used in an independent network, the number of required 5G macro cells will be very large, estimated to be 1.2 to 2 times of the 4G era. In combination with the separate architecture of AAU and DU, fiber resources are critical to network deployment. The deployed ODN network has an optical fiber density at least ten times that required for 5G, allowing for economical and fast access to 5G AAUs. In addition, in the newly created 5G coverage area or hotspot area, the location of the DU has been considered. Deployment of DUs using the OLT in the access room can effectively reduce the total cost, including lease and new network construction costs and DU site maintenance costs.

In the existing scheme for smoothly upgrading GPON to Combo PON deployed by an operator, a Combo PON Plus solution is introduced, and the scheme adopts an independent wavelength superposition mechanism, and simultaneously implements GPON, 10G PON access and 5G forwarding through one port and one trunk fiber, fully utilizes existing FTTx infrastructure resources, allows fixed and mobile networks to share the infrastructure resources, and provides stable and reliable FTTx and 5G dual-gigabit access for an end user.

Disclosure of Invention

In order to realize that GPON, XG (S), PON and 5G forward transmission share a trunk optical fiber, the invention provides a novel three-transmitting three-receiving single-fiber six-way optical device and a packaging process, 10G GPON OLT, GPON OLT and 5G forward transmission are integrated together, an internal optical path adopts a parallel light design, an EML laser with the wavelength of 1575-; the uplink adopts a high-performance APD-TIA detector with the wavelength of 1260-; P2P configuration with 25G rate increase: 1420-.

The technical scheme adopted by the invention is as follows: a novel three-emitting three-receiving single-fiber six-direction optical device comprises a shell, three lasers, two detectors and a passive adapter component, wherein the three lasers, the two detectors and the passive adapter component are fixed on the shell, the three lasers are respectively a 10G laser TO-CAN, a 2.5G laser TO-CAN and a 25G DFB laser, and the three lasers share one isolator; the two detectors are respectively a 25G PIN-TIA detector and a double-rate APD-TIA detector TO-CAN; a 15-degree light splitting sheet is arranged in the collimation light path; three 15 ° splitters and a 30 ° reflective slide were placed at the detector end.

The invention also provides a novel packaging process of the three-transmitting three-receiving single-fiber six-direction optical device, which comprises the following steps:

step one, respectively bonding four 15-degree light splitting sheets and a 30-degree reflecting glass sheet on an inclined plane in a shell through a glue baking process;

step two, respectively bonding the first C-LENS 13 and the second C-LENS18 in positioning holes in the shell through a glue baking process and performing high-temperature curing, assembling the polarization optical isolator 6 in the positioning holes in the shell, and performing glue dispensing bonding and high-temperature curing; then respectively sticking the first 45-degree filter plate 15 and the second 45-degree filter plate 16 on the corresponding inclined planes in the shell;

fixing the passive adapter assembly at the adapter end on the shell, and fixing the 10G laser TO-CAN and the shell by laser welding when the focus of the 10G laser TO-CAN is in the optimal position and the light output of the adapter end is maximum by adjusting the 10G laser transition ring; then, inversely coupling the passive adapter component, adjusting a transition ring of the passive adapter component to enable the light output power of the passive adapter to be maximum, and fixing the passive adapter and the shell by laser welding;

step four, enabling the welding assembly of the 2.5G laser TO-CAN and the 25G DFB laser and the laser tube seat TO enable the light output of the adapter end TO be maximum by adjusting a laser transition ring, and then fixing the 2.5G laser TO-CAN and the 25G DFB laser and the shell together by laser welding;

fixing the 0-degree filter and the external C-LENS of the first detector on a filter support by adopting a high-temperature glue baking process, integrally assembling the filter and the first detector in a positioning hole of a shell, pre-fixing the filter and the first detector by using glue, coupling the 25G PIN-TIA detector to the maximum degree by adopting a coupling glue process, fixing the detector, and finally, baking and curing at a high temperature;

fixing the two second detectors with external C-LENS on external LENS supports through high-temperature baking glue, integrally assembling the two second detectors in positioning holes of the shell, positioning and pre-fixing the two second detectors by using a positioning tool, coupling the two second detectors with the dual-rate APD-TIA detectors TO-CAN, and monitoring the responsivity of the two second detectors TO the optimal position for curing;

and seventhly, carrying out temperature circulation after packaging, testing after temperature circulation, and finally packaging qualified products.

Compared with the prior art, the invention has the following positive effects:

1. the invention integrates the GPON OLT, the 10G XG (S) PON OLT and the 5G forward transmission function into one optical device by utilizing an independent wavelength superposition mode, supports the existing GPON network, can be smoothly upgraded to the 10G PON network, and is connected with the 5G base station through the OLT platform in the FTTx network. Compared with the traditional optical fiber direct connection scheme, the scheme of the invention fully utilizes the deployed access machine room, the optical fiber and the pipeline thereof, the outdoor unit cabinet and other infrastructure in the FTTx network, can effectively reduce the 5G service deployment cost, shortens the service distribution time, is beneficial to realizing the resource sharing of a fixed network and a mobile network, and assists the construction of a comprehensive service access area.

2. The invention adopts a parallel light transmission scheme, and greatly reduces the internal loss in the light path with a close wavelength interval.

3. The invention adopts the design of the small-angle filter, and only one 15-degree light splitter is arranged in the collimation light path (parallel light) of the main light path, thereby reducing the internal loss of optical devices, improving the yield of products and saving the cost.

4. The invention adopts a mode that 3 transmitting terminals share one isolator, thus effectively reducing the material cost and the process cost of the product and enabling the overall dimension of the product to be more miniaturized.

5. The invention integrates two APD-TIA TO-CAN into a whole, adopts external parallel light small-angle light splitting, CAN effectively improve the isolation between near wave bands, and ensures that the total length of the device meets the requirement of miniaturization.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a diagram comparing the filter designs of the prior art and the present invention;

FIG. 3 is a diagram comparing a prior art optical isolator design with the present invention;

FIG. 4 is a schematic view of the structure of a low angle beamsplitter of the present invention;

FIG. 5 is a schematic view of an external lens holder according to the present invention;

FIG. 6 is a schematic diagram of the arrangement of the polarization optical isolator 6 and the second C-LENS18 of the present invention.

Detailed Description

A novel three-emitting three-receiving single-fiber six-direction optical device, as shown in fig. 1, comprising: 10G laser TO-CAN1, 10G laser transition ring 2, laser transition ring 3, 2.5G laser tube seat 4, 2.5G laser TO-CAN 5, polarization optical isolator 6, 0 degree LENS filter support 7, 25G PIN-TIA detector 8, 0 degree filter 9, first detector external C-LENS 10, first 15 degree small angle spectroscope 11, shell 12, first C-LENS 13, passive adapter component 14, first 45 degree filter 15, second 45 degree filter 16, 25G DFB laser 17, second C-LENS18, second 15 degree small angle spectroscope 19, third 15 degree small angle spectroscope 20, 30 degree reflection glass 21, fourth 15 degree small angle spectroscope 22, two-speed APD-TIA detector TO-23, second external detector C-LENS 24, LENS support 25, two-speed detector TO-TIA 23, Passive adapter assembly transition ring 26, and the like, wherein:

the invention has the following specific structure:

1. the first 45-degree filter 15 and the second 45-degree filter 16 are respectively bonded on a 45-degree inclined plane in the shell 12 through a glue baking process, and the polarized light isolator 6, the first C-LENS 13 and the second C-LENS18 are respectively bonded inside the shell through the glue baking process;

2. the first 15-degree small-angle spectroscope 11, the second 15-degree small-angle spectroscope 19, the third 15-degree small-angle spectroscope 20, the 30-degree reflecting glass sheet 21 and the fourth 15-degree small-angle spectroscope 22 are bonded on the inclined plane inside the shell by adopting a glue baking process;

3. the 0-degree filter 9 and the first detector external C-LENS 10 are fixed on the 0-degree LENS filter support 7 through glue baking process; the two second detector external C-LENS 24 are bonded on the external LENS support 25 by adopting a glue baking process;

4. the 10G laser TO-CAN1 is used as an adjusting ring through a 10G laser transition ring 2, the focal position of the laser is adjusted by adopting a coupling process, so that the EML laser is welded with the shell 12 by a laser welding process after the output power of the EML laser at the passive adapter end is maximum; 2.5G lasers TO-CAN 5 and 25G DFB laser 17 and 2.5G laser tube socket 4 adopt resistance welding TO discharge and weld as an organic whole separately, then adjust the focus position of the laser TO make the output power of the passive adapter end maximum through the laser transition ring 3 as the regulating ring and adopting the method of the coupling process, weld with the outer casing 12 together with the laser welding process;

the 0-degree filter 9, the first detector external C-LENS 10 and the 0-degree LENS filter support 7 assembly are fixed in a positioning hole of the shell 12 as a whole through a glue baking process and are bonded with the 25G PIN-TIA detector 8 through a coupling gluing process; the assembly of the two second detectors, namely the external C-LENS 24 and the external LENS support 25, is positioned in the positioning hole of the shell 12 through a glue baking process, and is subjected TO glue curing after the double-rate APD-TIA detector TO-CAN 23 monitors the maximum coupling responsivity of the double APDs through a coupling glue process;

the passive adapter assembly 14 is welded to the housing 12 as an adjustment ring by a laser welding process through an adapter assembly transition ring 26.

In summary, 3 lasers, two detectors and the adapter are fixed outside the shell, the rest materials are fixed in the shell, the shell is a rectangular six-hole shell, three end positioning holes are used for welding the three lasers, one end positioning hole extends outwards to form a circular guide hole for welding the passive adapter, and the other two end positioning holes adopt a gluing process to fix the two detectors.

Secondly, the specific packaging process of the invention comprises the following steps:

step one, a first 15-degree small-angle light splitting sheet 11, a second 15-degree small-angle light splitting sheet 19, a third 15-degree small-angle light splitting sheet 20, a 30-degree reflecting glass sheet 21 and a fourth 15-degree small-angle light splitting sheet 22 are respectively bonded on an inclined plane in a shell through a glue baking process, after glue baking is finished, deflection of a light path is detected, and meanwhile, the cleanliness of a filter is checked;

step two, respectively bonding the first C-LENS 13 and the second C-LENS18 in positioning holes in the shell through a glue baking process and performing high-temperature curing, assembling the polarization optical isolator 6 in the positioning holes in the shell, and performing glue dispensing bonding and high-temperature curing; then, the first 45 degree filter 15 and the second 45 degree filter 16 are respectively adhered to the corresponding inclined planes inside the housing, and are cleaned and checked without damage.

Thirdly, fixing the focus of the 10G laser TO-CAN1 at the optimal position and fixing the focus of the 10G laser TO-CAN1 with the shell 12 by laser welding when the adapter end emits light TO the maximum by adjusting the 10G laser transition ring 2 at the adapter end on the shell by using a standard passive adapter assembly 14, and checking the quality of welding spots after welding without defects such as welding penetration, cold welding and the like; then flip-chip coupling passive adapter subassembly 14 again, adjustable passive adapter subassembly transition ring 26 makes passive adapter light output power the biggest, fixes passive adapter and shell with laser welding, inspects the terminal surface of passive adapter and solder joint quality after accomplishing.

Step four, welding the 2.5G laser tube seat 4 and the 2.5G laser TO-CAN 5 together through resistance welding, detecting the welding quality, adjusting the laser transition ring 3 TO enable the adapter end TO emit light TO the maximum, and fixing the 2.5G laser TO-CAN 5 and the shell together through laser welding; fixing the 25G DFB laser 17 and the shell 12 in the same way by laser welding, and checking the quality of a welding spot after the completion of the laser welding, wherein the defects of welding penetration, insufficient welding and the like are required to be avoided;

fixing the 0-degree filter 9 and the first detector external C-LENS 10 on the 0-degree LENS filter support 7 by adopting a high-temperature glue baking process, integrally assembling the 0-degree filter and the first detector in a positioning hole of the shell 12, pre-fixing the 0-degree LENS filter and the first detector with glue, coupling the 25G PIN-TIA detector 8 to the maximum responsivity by adopting a coupling glue process, fixing the 25G PIN-TIA detector, performing high-temperature baking and curing, and checking that the appearance and the end face cleanliness of the passive adapter are qualified after the completion;

fixing the two second detectors, namely the external C-LENS 24, on the external LENS support 25 through high-temperature baking glue, putting the whole into a positioning hole in the shell, positioning and pre-fixing the whole by using a positioning tool, then coupling the dual-rate APD-TIA detectors TO-CAN 23, monitoring the responsivity of 10G and 12.5G detected PDs TO the optimal position for curing, namely epoxy resin glue curing, controlling the temperature TO be 85 +/-10 ℃, and keeping the time TO be 80-100 minutes;

seventhly, performing temperature circulation after the devices are completely packaged, wherein the temperature circulation is required to be circulated between minus 40 ℃ and 85 ℃, the constant temperature of minus 40 ℃ and 85 ℃ is kept for at least 30 minutes to form a circulation period, each circulation period is not less than 40 periods, and stress generated during welding can be released through sufficient high-temperature and low-temperature change so as to achieve better product performance;

step eight, testing after the temperature of the device is circulated, wherein the laser of the test item comprises: power, threshold current, skew efficiency, monitoring current, operating voltage, resistance test, etc., the detector has: testing the optical power and the avalanche voltage, and finally packaging qualified products.

Thirdly, the invention is different from the background technology:

1. the background technology needs a 25G scheme configured by a 10G GPON OLT, a GPON OLT and a P2P to realize FTTH and 5G forward transmission, an external combiner scheme is adopted, and a point-to-point direct optical fiber connection solution is added, but the invention can realize six-wavelength transmission by only one optical device, simultaneously supports the functions of the GPON OLT and the 10G GPON OLT and 5G forward transmission, and supports 5G deployment and smooth upgrade of the GPON network to a 10G PON network by fully utilizing the existing FTTx network resources, so as to effectively reduce the 5G deployment cost and shorten the time to market, thereby helping an operator establish comprehensive service access area sharing and cost-effective network construction by taking resources as targets. The invention can use the existing network equipment without changing the existing network resources and occupying additional machine room space.

The background technology adopts a common optical path design, the wavelength interval of the technology is relatively close, and the optical loss of the whole link is increased by adopting the conventional optical path design, so that the technology adopts a parallel light transmission scheme.

As shown in figure 2, the loss of the conventional 45-degree filter is too large in the background technology, the processing difficulty of suppliers is large, the cost of raw materials is increased, the technology adopts the design of small-angle 15-degree and 30-degree filters, the light splitting and isolation can be realized only by the light splitting piece at the end of each detector, only one 15-degree filter is arranged on the main light path of collimated light, the internal loss of an optical device can be greatly reduced, the yield of products is improved, and the cost is saved. Meanwhile, the common single 1.25G APD-TIA TO-CAN and 10G APD-TIA TO-CAN detectors are adopted in the background technology, an integrated packaging scheme is adopted in the technology, two PD detectors are attached TO one detector TO-CAN, the external double C-LENS mode is used for focusing, and a light path inside the shell is split by collimated light, so that the loss CAN be greatly reduced, and the receiving coupling efficiency of the detectors is improved.

2. As shown in figure 3, the background art adopts solitary optical isolator design to 3 transmission laser ends, this technique only places an optical isolator before main light path C-LENS and can realize optical isolation, and the isolation all satisfies the requirements, can reduce the overall dimension of product simultaneously and realize the miniaturized encapsulation of product, because the isolator is placed in C-LENS the place ahead, can use the optical isolator in aperture, but the material cost and the assembly process cost of the greatly reduced product of isolator quantity reduction and aperture reduction.

The positive effects of the invention are realized under the condition of ensuring that the existing network equipment is not changed:

1. the GPON OLT, the 10G X (S) GPON OLT and the 25G forward transmission are miniaturized and integrated into a three-transmitting three-receiving single-fiber six-direction optical device;

2. the transmitting end of the optical device adopts a scheme of converting convergent light into parallel light inside the shell and a scheme of converting the convergent light into a small-angle filter, so that crosstalk caused by the fact that all wavelengths are close to each other is avoided, the internal loss of the optical device is reduced, the yield of the product is improved, and the cost is saved;

3. the detector end adopts double flat windows APD-TIA TO-CAN, external double lenses, and integrates two PD detectors together, thereby reducing the packaging process steps of the device and saving labor cost and material cost.

4. Only one 15-degree beam splitter is arranged in the collimation light path, so that the loss in the device can be greatly reduced; the third 15-degree low-angle beam splitter 20 can transmit 1370nm light and reflect 1310&1270nm light; the fourth 15-degree small-angle spectroscope 22 can reflect 1270nm light, transmits 1310nm light, is compatible with the function of a 0-degree optical filter, and reflects 1270nm light through the first 15-degree small-angle spectroscope 11 to be converged into the detector through the C-LENS.

Fifthly, the structure and the packaging process are characterized in that:

1. as shown in FIG. 4, the invention adopts the 15-degree and 30-degree small-angle filters, light emitted by the adapter is converted into collimated light through the first C-LENS 13, and the inside of the adapter adopts the parallel light small-angle beam splitter for splitting, so that the problem that the interval between the receiving wavelengths of two detectors is short, the loss of the conventional 45-degree beam splitter is too large, the processing difficulty of a supplier is too large, the cost of raw materials is increased, the internal loss of a device is reduced, the yield of products is improved, and the cost is saved is solved.

2. As shown in fig. 5, the external C-LENS holder (i.e., the external LENS holder 25) of the dual-emission detector can hold two C-lenses at the same time.

3. As shown in fig. 6, 3 emitting lasers share one isolator (polarization optical isolator 6), the number of isolators is reduced, the material cost and the assembly cost of the product are reduced, in addition, the isolator is placed in front of the second C-LENS18, the aperture is reduced, the cost of a single isolator can be reduced, the overall size of the whole device can be reduced, and the miniaturized package is realized.

Claims

1. A novel three-emitting three-receiving single-fiber six-direction optical device is characterized in that: the laser system comprises a shell, three lasers, two detectors and a passive adapter component, wherein the three lasers, the two detectors and the passive adapter component are fixed on the shell, the three lasers are respectively a 10G laser TO-CAN, a 2.5G laser TO-CAN and a 25G DFB laser, and the three lasers share one isolator; the two detectors are respectively a 25G PIN-TIA detector and a double-rate APD-TIA detector TO-CAN; a 15-degree light splitting sheet is arranged in the collimation light path; three 15 ° splitters and a 30 ° reflective slide were placed at the detector end.

2. The novel three-emitting three-receiving single-fiber six-way optical device according to claim 1, characterized in that: the 10G laser TO-CAN is welded with the shell through a laser transition ring; the 2.5G lasers TO-CAN and the 25G DFB are respectively welded with the laser tube base and then are welded with the shell through the laser transition ring.

3. The novel three-emitting three-receiving single-fiber six-way optical device according to claim 1, characterized in that: the 25G PIN-TIA detector is bonded with a first detector external C-LENS and a 0-degree filter assembly arranged in the shell positioning hole.

4. The novel three-emitting three-receiving single-fiber six-way optical device according to claim 1, characterized in that: the dual-rate APD-TIA detector TO-CAN is bonded with two second detector external C-LENS and an external LENS bracket assembly which are arranged in the shell positioning hole.

5. The novel three-emitting three-receiving single-fiber six-way optical device according to claim 1, characterized in that: on an inclined plane inside the shell, a 30-degree reflecting glass sheet and a 15-degree light splitting sheet are arranged near the TO-CAN end of the dual-rate APD-TIA detector, and two 15-degree light splitting sheets are arranged near the 25G PIN-TIA detector; set up first 45 filters and second 45 filters on 45 inclined planes inside the shell.

6. The novel three-emitting three-receiving single-fiber six-way optical device according to claim 1, characterized in that: a first C-LENS and a second C-LENS are provided inside the housing, and a polarization optical isolator is provided in front of the second C-LENS.

7. A novel packaging process of a three-emitting three-receiving single-fiber six-direction optical device is characterized by comprising the following steps of: the method comprises the following steps:

fixing the 0-degree filter and the external C-LENS of the first detector on a filter support by adopting a high-temperature glue baking process, integrally assembling the filter and the first detector in a positioning hole of the shell, pre-fixing the filter and the first detector by using glue, coupling the responsivity of the 25GPIN-TIA detector to the maximum by adopting a coupling glue process, fixing the detector, and finally baking and curing the detector at a high temperature;

8. The novel packaging process of the three-emitting three-receiving single-fiber six-way optical device according to claim 7, wherein: and sixthly, curing the two detectors by using epoxy resin glue at the curing temperature of 85 +/-10 ℃ for 80-100 minutes.

9. The novel packaging process of the three-emitting three-receiving single-fiber six-way optical device according to claim 7, wherein: and seventhly, circulating the temperature at minus 40-85 ℃, wherein the circulation period of constant temperature at minus 40 ℃ and 85 ℃ is at least 30 minutes, and each circulation is not less than 40 periods.

10. The novel packaging process of the three-emitting three-receiving single-fiber six-way optical device according to claim 7, wherein: and seventhly, testing the power, the threshold current, the slope efficiency, the monitoring current, the working voltage and the resistance of the laser, and testing the optical power and the avalanche voltage of the detector.