CN114019624A

CN114019624A - Novel dense wavelength division multiplexing single-fiber three-dimensional optical device and packaging process thereof

Info

Publication number: CN114019624A
Application number: CN202111358558.3A
Authority: CN
Inventors: 李金伟; 张帅; 王宏超
Original assignee: Sunstar Communication Technology Co ltd
Current assignee: Sunstar Communication Technology Co ltd
Priority date: 2021-11-16
Filing date: 2021-11-16
Publication date: 2022-02-08

Abstract

The invention discloses a novel dense wavelength division multiplexing single-fiber three-dimensional optical device and a packaging process thereof, wherein the optical device comprises a shell, a 10G DFB laser TO-CAN, a 1.25G VPD detector TO-CAN, a 10G APD detector TO-CAN and a passive adapter component, wherein the 10G DFB laser TO-CAN, the 1.25G VPD detector TO-CAN, the 10G APD detector TO-CAN and the passive adapter component are fixed on the shell; and a 45-degree filter plate and 2 0-degree filter plates which are arranged in the shell, wherein one of the 0-degree filter plate and the 2-degree filter plate is a 0-degree DWDM filter plate, a 13-degree filter plate, a 32-degree filter plate, 4C-lens and an isolator. The invention has the positive effects that: by adopting a combined mode of converging light and parallel light, 1.25G DWDM video signal receiving is added on the basis of a 10G PON ONU, the problems of low optical isolation and overlarge optical path transmission loss in dense wavelength division multiplexing products are effectively solved, optical fiber resources are greatly saved, and the overall dimension space is more miniaturized.

Description

Novel dense wavelength division multiplexing single-fiber three-dimensional optical device and packaging process thereof

Technical Field

The invention relates to a novel dense wavelength division multiplexing single-fiber three-dimensional optical device and a packaging process thereof.

Background

With the popularization of optical fiber communication and the demand of broad users for broadband with higher speed, and in the background of mature application of 10G PON technology, the richness and diversity of broadband transmission signals of end customers are more concerned and expected, and the optical devices of the core elements of broadband transmission terminals are still added with detector devices separately used for receiving other wavelength signals on the basis of the existing 10G PON ONUs, which undoubtedly causes great waste in equipment space and cost.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a novel dense wavelength division multiplexing single-fiber three-way optical device and a packaging process thereof, aiming at the problem of compatibility of 1.25G VPD and 10G APD, wherein an internal optical path adopts a parallel light + convergent light design, a DFB laser with the wavelength of 1260 and 1280nm is adopted in an uplink to transmit 10Gbps continuous signals; a high-performance APD-TIA detector is adopted to receive 10Gbps signals with transmission wavelengths of 1575-1580nm, and a high-performance special VPD detector is adopted to receive 1.25Gbps DWDM signals with transmission wavelengths of 1558.68-1559.28 nm; and a wavelength division multiplexing system is adopted, so that the transmission of three wavelengths of a single fiber is realized.

The technical scheme adopted by the invention is as follows: a novel dense wavelength division multiplexing single-fiber three-dimensional optical device comprises a shell, a 10G DFB laser TO-CAN, a 1.25G VPD detector TO-CAN, a 10G APD detector TO-CAN and a passive adapter component, wherein the 10G DFB laser TO-CAN, the 1.25G VPD detector TO-CAN and the 10G APD detector TO-CAN are fixed on the shell; an isolator, a first C-lens and a 45-degree filter plate are sequentially arranged at one end, close TO the TO-CAN of the 10G DFB laser, in the shell; a second C-lens and a first 0-degree filter plate are sequentially arranged at one end, close TO the TO-CAN of the 1.25G VPD detector, in the shell; a second 0-degree filter plate and a third C-lens are sequentially arranged at one end, close TO the TO-CAN, of the 10G APD detector in the shell; one end of the shell close to the passive adapter component is sequentially provided with a 13-degree filter plate, a 32-degree filter plate and a fourth C-lens. .

The invention also provides a novel packaging process of the dense wavelength division multiplexing single-fiber three-dimensional optical device, which comprises the following steps:

step one, curing and bonding a 45-degree filter in a shell through high-temperature baking glue, curing and bonding a 13-degree filter and a 32-degree filter on a third mirror frame through high-temperature baking glue, and then pressing the third mirror frame into the shell;

step two, solidifying and bonding the isolator and the first C-lens on the isolator seat and the lens seat through high-temperature baking glue, and then solidifying and bonding the isolator seat and the lens seat in the shell through high-temperature baking glue;

step three, respectively solidifying and bonding the first 0-degree filter and the second C-lens, and the second 0-degree filter and the third C-lens on the first lens frame and the second lens frame through high-temperature baking glue, and then respectively solidifying the first lens frame and the second lens frame on corresponding positions of the shell through high-temperature baking glue;

step four, curing and adhering a fourth C-lens on the ferrule sleeve lens seat through high-temperature baking glue, then using the ferrule sleeve transition ring as an adjusting ring to laser-weld the ferrule sleeve lens seat and the passive adapter component into a whole, and welding the whole to the third lens frame end assembled on the shell;

step five, the TO-CAN of the 10G DFB laser and the tube seat of the DFB laser are pressed, penetrated, welded and connected into a whole, and then welded with the shell together by taking the transition ring of the DFB laser as an adjusting ring;

sixthly, welding the TO-CAN of the 1.25G VPD detector and the tube seat of the 1.25G VPD detector into a whole in an energy storage manner, and then welding the integrated tube and the shell together by using a transition ring of the VPD detector as an adjusting ring;

step seven, solidifying and adhering the 10G APD detector TO-CAN on the shell through high-temperature baking glue;

and step eight, performing temperature circulation and testing after the devices are completely packaged, and packaging after the devices are tested to be qualified.

Compared with the prior art, the invention has the following positive effects: the novel dense wavelength division multiplexing single-fiber three-way optical device integrates the wave-combining function into one optical device and simultaneously supports the functions of 10G PON ONU and DWDM signal receiving. In the existing network equipment, the defect that the conventional 10G PON ONU and DWDM signals need to be received by different optical devices is overcome, and the single device realizes the receiving and transmitting of various signals, so that the equipment cost and the equipment space are greatly saved. The concrete expression is as follows:

1. the wave combining function is integrated into one optical device, and the functions of 10G PON ONU and DWDM signal receiving are simultaneously supported, so that the number of the optical devices is reduced, the equipment space is saved, and the equipment cost is reduced;

2. by adopting a parallel light transmission scheme and converging light, the internal loss is greatly reduced in a light path with a close wavelength interval;

3. the design of the small-angle light-splitting filter is adopted, so that the internal loss of an optical device is reduced, the yield of the product is improved, and the cost is saved;

4. the 1.25G VPD detector adopts a flat window TO-CAN, makes full use of the advantage of a 0-degree DWDM filter plate in a very narrow passband of parallel light transmission, and has a good isolation effect on stopband wavelengths.

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 diagram of a DWDM single-fiber three-way optical device;

fig. 2 is a schematic structural diagram of the housing of the present invention, wherein: (1) is a sectional view, and (2) is a perspective view;

FIG. 3 is a schematic diagram of a 13 and 32 low angle filter;

FIG. 4 is a schematic view of the isolator mount and lens mount corresponding thereto;

FIG. 5 is a schematic diagram of the structure of three TO-CAN's.

Detailed Description

A novel dense wavelength division multiplexing (dwdm) single-fiber three-way optical device, as shown in fig. 1, includes: 10G DFB laser TO-CAN 1, DFB laser tube seat 2, DFB laser transition ring 3, isolator seat & lens seat 4, VPD detector transition ring 5, 1.25G VPD detector tube seat 6, 1.25G VPD detector TO-CAN 7, second C-lens 8, first 0 degree filter 9, first lens frame 10, 32 degree filter 11, third lens frame 12, isolator 13, first C-lens 14, shell 15, 45

degree filter

16, 13 degree filter 17, 10G APD detector TO-CAN 18, second 0 degree filter 19, third C-lens20, second lens frame 21, fourth C-lens 22, ferrule sleeve lens seat 23, insert new sleeve transition ring 24, passive adaptation component 25, etc., wherein:

the invention has the following specific structure:

the invention is divided into a passive adapter assembly and an active optical device assembly, wherein:

the passive adapter assembly includes: the metal tail handle and the ceramic ferrule, the single mode fiber and the SC/PC connector are arranged in the metal tail handle, wherein the ceramic ferrule is connected with the metal tail handle in an interference fit manner.

The active optical device assembly includes: 10G DFB laser TO-CAN 1, 1.25G VPD detector TO-CAN 7, 10G APD detector TO-CAN 18, 45

degree filter

16, 20 degree filters 9 and 19 (one of which is a 0 degree DWDM filter), 13 degree filter 17, 32 degree filter 11, 4C-lens (8, 14, 20, 22) and isolator 13. Wherein:

(1) the first C-lens 14 and the isolator seat and lens seat 4 are bonded together by adopting a glue baking process and then bonded inside the shell 15 by adopting a glue baking process, and the 10G DFB laser TO-CAN 1 is welded on the shell 15;

(2) the second C-lens 8 is bonded with the first lens frame 10 into a whole by adopting a glue baking process; the first 0 degree (DWDM) filter 9 is bonded on the first lens frame 10 by adopting a glue baking process, the first 0 degree (DWDM) filter 9, the first lens frame 10 and the second C-lens 8 are bonded inside the shell 15 as a whole by adopting the glue baking process, and the 1.25G VPD detector TO-CAN 7 is welded on the shell 15 by adopting a welding process;

(3) the third C-lens20 is bonded with the second lens frame 21 into a whole by adopting a glue baking process, the second 0-degree filter plate 19 is bonded on the second lens frame 21 by adopting a glue baking process, the third C-lens20, the second lens frame 21 and the second 0-degree filter plate 19 are bonded in the shell 15 as a whole by adopting a glue baking process, and the 10G APD detector TO-CAN 18 is bonded on the shell 15 by adopting a glue baking process;

(4) the 45-degree filter 16 is bonded inside the shell 15 through a glue baking process, the 13-degree filter 17 and the 32-degree filter 11 are bonded on the third mirror bracket 12 through the glue baking process, and the third mirror bracket 12 is pressed in the shell 15 and is glued to increase the connection strength; the fourth C-lens 22 is bonded on the ferrule sleeve lens seat 23 by adopting a glue baking process, and the ferrule sleeve lens seat 23 and the passive adapter component 25 are welded into a parallel light component and then welded on the shell.

In summary, the laser, the two detectors and the adapter are fixed outside the housing, and the rest of the components are fixed inside the housing, the housing is a rectangular four-way housing, wherein one end of the housing is provided with a positioning hole for welding the laser, the other end of the housing is provided with a positioning hole for welding the passive adapter, and the other two ends of the housing are provided with positioning holes for fixing the two detectors by welding and gluing processes.

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

step one, curing and bonding a 45-degree filter 16 in a shell 15 through high-temperature baking glue, curing and bonding a 13-degree filter 17 and a 32-degree filter 11 on a third mirror frame 12 through high-temperature baking glue, and then pressing the third mirror frame 12 into the shell 15 through a mirror frame press-fitting tool;

step two, the isolator 13 and the first C-lens 14 are solidified and adhered on the isolator seat & lens seat 4 through high-temperature baking glue, and then the isolator seat & lens seat 4 is adhered in the shell 15 through high-temperature baking glue solidification again;

step three, a first 0 degree (DWDM) filter 9 and a second C-lens 8, a second 0 degree filter 19 and a third C-lens20 are respectively bonded on a first lens frame 10 and a second lens frame 21 through high-temperature baking glue curing, and two new whole bodies are respectively cured on corresponding positions of a shell 15 through high-temperature baking glue curing;

step four, curing and adhering a fourth C-lens 22 on the ferrule sleeve lens seat 23 through high-temperature baking glue, then carrying out laser high-temperature welding on the ferrule sleeve lens seat 23 and the passive adapter assembly 25 into a whole through taking the ferrule sleeve transition ring 24 as an adjusting ring, and welding the whole to the end of the third lens frame 12 with the assembled shell;

step five, the 10G DFB laser TO-CAN 1 and the DFB laser tube seat 2 are pressed, penetrated, welded and connected into a whole and then welded with the shell 15 through the DFB laser transition ring 3 as an adjusting ring;

sixthly, the TO-CAN 7 of the 1.25G VPD detector and the tube seat 6 of the 1.25G VPD detector are connected into a whole in an energy storage manner and then are welded with the shell 15 together as an adjusting ring through a transition ring 5 of the VPD detector;

seventhly, curing and adhering the 10G APD detector TO-CAN 18 on the shell 15 through high-temperature baking glue;

Thirdly, the invention is different from the background technology:

in the background art, a 10G PON ONU adopts a common optical path design, the emission wavelength is 1270nm, the receiving wavelength is 1577nm, the DWDM wavelength of 1558.98nm is added on the basis of the 10G PON ONU, and the newly added wavelength 1558.98nm is very close to the original receiving wavelength 1577nm, so that the optical loss of the whole optical path is very large by adopting the conventional optical path design, and the technology adopts a parallel light + convergent light transmission scheme.

The technical scheme adopts a conventional convergent light optical path design, cannot meet the requirement of wavelength signal transmission, and has the difficulty that filter design and manufacture are not feasible, and the design of matching parallel light with convergent light by adopting small-angle 13-degree and 32-degree light-splitting filters, can greatly reduce the internal loss of an optical device, improves the product packaging feasibility and has optimal performance.

Fourthly, the structure and the packaging process of the invention are characterized in that:

(1) the four-way shell is adopted, positioning holes are formed in two ends of a cavity, one positioning hole is used for welding a laser, the other positioning hole is used for welding a passive adapter assembly, and the bottom surface of the cavity is a plane as shown in figure 2.

(2) By adopting the 13-degree and 32-degree small-angle light-splitting filters, the problem that the loss of the conventional 45-degree light-splitting filter is too large due to the close interval of the receiving wavelengths of the two detectors is effectively solved, and meanwhile, the packaging feasibility of the product is improved and the cost is reduced, as shown in fig. 3.

(3) The LD lens holder and isolator holder are specially designed to place both lens and isolator, thus greatly saving the internal space of the device, as shown in fig. 4.

(4) The 2 TO-CAN receiving ends of the whole device are designed by adopting a structure of a flat window and an external lens, so that the problem that the space structure between the detector and the detector is limited due TO the limitation of the focal length is solved, as shown in figure 5.

The invention has the advantages that under the condition of ensuring that the existing network equipment is not changed, the invention realizes the following steps:

(1) the design of a parallel light + convergent light transmission scheme and a small-angle filter design scheme are adopted in the optical device, 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 effectively reduced, the yield of products is improved, and the cost is reduced;

(2) the shell adopts a powder metallurgy structure to replace a machining structure, and the material cost is reduced.

Claims

1. A novel dense wavelength division multiplexing single-fiber three-dimensional optical device is characterized in that: the optical fiber laser device comprises a shell, a 10G DFB laser TO-CAN, a 1.25G VPD detector TO-CAN, a 10G APD detector TO-CAN and a passive adapter assembly, wherein the 10G DFB laser TO-CAN, the 1.25G VPD detector TO-CAN and the 10G APD detector TO-CAN are fixed on the shell; an isolator, a first C-lens and a 45-degree filter plate are sequentially arranged at one end, close TO the TO-CAN of the 10G DFB laser, in the shell; a second C-lens and a first 0-degree filter plate are sequentially arranged at one end, close TO the TO-CAN of the 1.25G VPD detector, in the shell; a second 0-degree filter plate and a third C-lens are sequentially arranged at one end, close TO the TO-CAN, of the 10G APD detector in the shell; one end of the shell close to the passive adapter component is sequentially provided with a 13-degree filter plate, a 32-degree filter plate and a fourth C-lens.

2. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: the isolator and first C-lens are bonded to an isolator mount & lens mount which is bonded within the housing.

3. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: and the second C-lens and the first 0-degree filter plate are bonded on the first lens frame.

4. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: and the second 0-degree filter plate and the third C-lens are bonded on the second lens frame.

5. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: the 13-degree filter plate and the 32-degree filter plate are bonded on the third mirror frame.

6. The novel DWDM single-fiber three-way optical device according to claim 5, characterized in that: the fourth C-lens is bonded on the plug core sleeve lens seat, the plug core sleeve lens seat is welded with the passive adapter assembly into a whole through the plug core sleeve transition ring, and the plug core sleeve lens seat is welded with the third lens frame and the shell into a whole.

7. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: the TO-CAN of the 10G DFB laser and the tube seat of the DFB laser are connected into a whole in a press-fitting, penetrating and welding mode, and the tube seat of the DFB laser is welded with the shell through the transition ring of the DFB laser.

8. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: the TO-CAN of the 1.25G VPD detector and the tube seat of the 1.25G VPD detector are welded into a whole in an energy storage mode, and the tube seat of the 1.25G VPD detector is welded with the shell through a transition ring of the VPD detector.

9. The novel DWDM single-fiber three-way optical device according to claim 1, characterized in that: the shell is a four-way shell, positioning holes are formed in two ends of a cavity of the shell and are respectively used for welding the 10G DFB laser TO-CAN and the passive adapter assembly, and the bottom surface of the cavity is a plane.

10. A novel packaging process of a dense wavelength division multiplexing single-fiber three-dimensional optical device is characterized by comprising the following steps: the method comprises the following steps: