Novel single-fiber four-transmitting four-receiving BIDI optical device and packaging process thereof

Abstract

The invention discloses a novel single-fiber four-transmitting and four-receiving BIDI optical device and a packaging technology thereof.The single-fiber four-transmitting and four-receiving BIDI optical device comprises a metal shell, a four-transmitting TOSA, a four-receiving ROSA and an insertion core sleeve assembly, the four-transmitting TOSA, the four-receiving ROSA and the insertion core sleeve assembly are welded to the metal shell into a whole, a first mirror bracket and a second mirror bracket are arranged in the metal shell, a 8-degree filter, a 37-degree filter and an LENS are arranged on the first mirror bracket, and a third mirror bracket is arranged on the second mirror bracket; and a 45-degree filter is arranged on the second lens bracket. Compared with the prior art, the invention has the positive effects that the functions of a four-transmitting TOSA device and a four-receiving ROSA device are integrated, four-wave signals are integrated into one optical fiber by utilizing a wavelength division multiplexing function, and the four-transmitting four-receiving TOSA function and the four-transmitting four-receiving ROSA function are supported at the same time. According to the method, the existing terminal network equipment can be used, the existing network resources do not need to be changed, user requirements are changed as required according to service package upgrading, and rapid and smooth upgrading of high-bandwidth services is achieved.

Description

Technical Field

[0001] This invention relates to a novel single-fiber four-transmitter four-receiver BIDI optical device and its packaging process. Background Technology

[0002] Traditional long-haul coherent optical transmission relies on large, discrete, high-power (typically >100W) line cards or repeaters. The data center interconnect (DCI) market urgently needs a miniaturized, low-power, plug-and-play solution. This has created a demand for integrating complex coherent optical systems into pluggable packages such as QSFP-DD or OSFP without altering existing modules.

[0003] Currently, 100G, 200G, 400G, and 800G TOSA and single ROSA typically employ external multiplexer solutions. This solution requires additional line cards, external multiplexers, fiber optic patch cords, and fiber optic distribution frames, resulting in high construction costs, large data center space requirements, complex construction and cabling, and difficulties in management and maintenance. Furthermore, the optical power loss introduced by the external multiplexer can affect the optical power budget, posing a risk to user services. Summary of the Invention

[0004] To overcome the aforementioned shortcomings of existing technologies, this invention proposes a novel single-fiber four-transmitter four-receiver BIDI optical device and its packaging process, aiming to integrate the functions of four-transmitter TOSA and four-receiver ROSA. This invention integrates the four-transmitter TOSA and four-receiver ROSA together, uses multiple reflections with filters, and designs a 45° adjustable lens frame to correct the optical path, thereby realizing single-fiber four-transmitter four-receiver transmission.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a novel single-fiber four-transmitter four-receiver BIDI optical device, including a metal housing and a four-transmitter TOSA, a four-receiver ROSA and a ferrule assembly welded to the metal housing. A first lens frame and a second lens frame are arranged inside the metal housing. An 8° filter, a 37° filter and a LENS are arranged on the first lens frame, and a 45° filter is arranged on the second lens frame.

[0006] This invention also provides a novel packaging process for a single-fiber four-transmitter four-receiver BIDI optical device, comprising the following steps:

[0007] Step 1: Attach the isolator to the TOSA adjusting ring using a baking adhesive process;

[0008] Step 2: Laser weld the TOSA adjustment ring to the four-electrode TOSA;

[0009] Step 3: Sequentially glue the 8° filter, 37° filter, and lenses to the first frame using a baking adhesive process; then glue the first frame to the metal housing using the same process.

[0010] Step 4: Weld the four-electrode TOSA and ferrule assembly to the metal housing using laser welding to obtain the four-electrode TOSA active optical device assembly.

[0011] 1) Place the ferrule assembly inverted position into the clamp under the coupling table, fix and lock it. Place the metal housing on the ferrule assembly and fix and lock it. Place the four-electrode TOSA into the clamp on the coupling table. Couple the metal housing and the four-electrode TOSA in the X, Y and Z directions through the coupling table to optimize the power coupling of the four channels. Use laser welding process to weld the four-electrode TOSA to the metal housing as one piece.

[0012] 2) Place the welded quad-electrode TOSA and metal housing into the lower fixture of the coupling stage, and place the ferrule assembly into the upper fixture of the coupling stage. Use the ferrule adjustment ring to connect and couple the X, Y, and Z directions to optimize the power coupling of the four channels. Use laser welding technology to weld the ferrule assembly to the metal housing with the welded quad-electrode TOSA to obtain the quad-electrode TOSA active optical device assembly.

[0013] Step 5: Cycle the four-electrode TOSA active optical device assembly assembled in Step 4 between -40℃ and 85℃.

[0014] Step 6: Weld the ROSA adjustment ring to the four ROSA units using laser welding.

[0015] Step 7: Place the quad-emitting TOSA active optical device assembly, which has undergone temperature cycling in Step 5, into the coupling fixture for fixation. Attach the 45° filter to the second lens frame, and then install the second lens frame into the metal housing. Fix the quad-receiving ROSA with the ROSA adjustment ring welded on it onto the movable coupling fixture. Connect the light source to the ferrule assembly end. At this time, the optical signal is reflected by the 8° filter to the 37° filter, and then reflected by the 45° filter to the quad-receiving ROSA. Adjust the axial installation position and angle of the second lens frame to correct the optical path, so that the optical signal intensity reaches the optimal level for transmission to the quad-receiving ROSA. Use glue to fix the second lens frame to the metal housing. Perform X, Y, Z direction and angle coupling on the quad-receiving ROSA to optimize RSSI coupling. Then, use laser welding to weld the quad-receiving ROSA and the quad-emitting TOSA active optical device assembly into one piece, forming a novel single-fiber quad-emitting quad-receiving BIDI optical device.

[0016] Compared with the prior art, the positive effects of the present invention are:

[0017] This invention integrates the functions of a quad-transmit TOSA device and a quad-receive ROSA device into one unit. The metal housing includes lenses, a first lens frame, an 8° filter, a 37° filter, a second lens frame, and a 45° filter. This invention utilizes wavelength division multiplexing (WDM) to integrate four-wavelength signals into a single optical fiber, simultaneously supporting both quad-transmit / quad-receive TOSA and quad-transmit / quad-receive ROSA functions. This invention can be used with existing terminal network equipment without modifying existing network resources. It allows for rapid and smooth upgrades of high-bandwidth services by upgrading existing service packages and adapting to user needs. Specific advantages are as follows:

[0018] 1. Existing technology requires two optical devices: a four-transmit TOSA and a four-receive ROSA to achieve four-wavelength transmission. An external multiplexer solution is used, which requires additional line cards, external multiplexers, fiber optic patch cords, and fiber optic distribution frames, resulting in high construction costs, large equipment room space requirements, complex construction and cabling, and difficulties in management and maintenance. Furthermore, the introduction of an external multiplexer also leads to optical power loss.

[0019] 2. Existing technology uses a conventional single-tube design, which requires two pigtails connected by flanges, leading to increased raw material costs and significantly increased power loss of optical devices.

[0020] 3. This invention employs multiple reflections from a filter and utilizes a second lens mount to correct the optical path, integrating a four-transmit and four-receive function. This reduces the loss of optical power caused by external beam combining without altering the user's existing modules. Attached Figure Description

[0021] The present invention will be described by way of example and with reference to the accompanying drawings, wherein:

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating the working principle of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the second eyeglass frame of the present invention;

[0025] Figure 4 This is a schematic diagram of the second frame correction optical path of the present invention;

[0026] The reference numerals in the figure include: 1. Quad-output TOSA; 2. Quad-receiver ROSA; 3. TOSA adjustment ring; 4. Isolator; 5. First frame; 6. 37° filter; 7. Plug sleeve adjustment ring; 8. Plug sleeve assembly; 9. Lens; 10. 8° filter; 11. 45° filter; 12. Second frame; 13. Metal housing; 14. ROSA adjustment ring. Detailed Implementation

[0027] A novel single-fiber four-transmit four-receive BIDI optical device, such as Figure 1 As shown, it includes: a quad-output TOSA 1, a quad-receiver ROSA 2, a TOSA adjustment ring 3, an isolator 4, a first frame 5, a 37° filter 6, a ferrule adjustment ring 7, a ferrule assembly 8, lenses 9, an 8° filter 10, a 45° filter 11, a second frame 12, a metal housing 13, and a ROSA adjustment ring 14, etc., wherein:

[0028] The quad-electrode TOSA active optical device assembly includes a metal housing assembly and LENS 9, 8° filter 10, and 37° filter 6 disposed within the metal housing assembly. The quad-electrode TOSA 1 and the metal housing 13 are coupled and laser-welded through a TOSA adjustment ring 3. An isolator 4 is disposed within the TOSA adjustment ring.

[0029] The metal housing 13 and the ferrule assembly 8 are coupled by laser welding via the ferrule adjusting ring 7;

[0030] The four-receiver ROSA active optical device assembly includes a 45° filter 11 disposed in a metal housing assembly, a second lens frame 12 coupled, and a ROSA adjustment ring 14 coupled and welded, wherein the second lens frame 12 is coupled and bonded to the metal housing 13.

[0031] The four-transmitter TOSA active optical device assembly and the four-receiver ROSA active optical device assembly share a single ferrule assembly 8.

[0032] The packaging process for the novel single-fiber four-transmitter four-receiver BIDI optical device of the present invention includes the following steps:

[0033] Step 1: Isolator 4 is bonded to the TOSA adjusting ring 3 using a baking adhesive process;

[0034] Step 2: The TOSA adjustment ring 3 is laser-welded onto the four-shot TOSA 1;

[0035] Step 3: Sequentially bond the 8° filter 10, the 37° filter 6, and the lens 9 to the first frame 5 using a baking adhesive process; then bond the first frame 5 to the metal housing 13 using a baking adhesive process.

[0036] Step 4: Weld the four TOSA 1s and the ferrule assembly 8 to the metal housing 13 using laser welding.

[0037] 1) Place the ferrule assembly 8 inverted position into the clamp under the coupling table, fix and lock it. Place the metal housing 13 on the ferrule assembly 8 and fix and lock it. Place the four-electrode TOSA 1 into the clamp on the coupling table. Couple the metal housing and the four-electrode TOSA in the X, Y and Z directions through the coupling table to optimize the power coupling of the four channels. Use laser welding process to weld the four-electrode TOSA and the metal housing 13 into one piece.

[0038] 2) Place the four-electrode TOSA and the metal housing 13, which are welded together, into the lower fixture of the coupling stage. Place the ferrule assembly 8 into the upper fixture of the coupling stage. Use the ferrule adjusting ring 7 to connect and couple the X, Y, and Z directions to optimize the power coupling of the four channels. Use laser welding technology to weld the ferrule assembly 8 to the metal housing 13 with the four-electrode TOSA welded together to obtain the four-electrode TOSA active optical device assembly.

[0039] Step 5: The assembled four-electrode TOSA active optical device assembly is subjected to temperature cycling between -40℃ and 85℃.

[0040] Step 6: Weld the ROSA adjustment ring 14 to the four ROSA 2 units using laser welding technology;

[0041] Step 7: Place the assembled quad-emitting TOSA active optical device assembly into the coupling fixture for fixation. Attach the 45° filter 11 to the second frame 12, and then install the second frame 12 into the metal housing 13. Fix the quad-receiving ROSA 2, with the ROSA adjustment ring 14 welded on, onto the movable coupling fixture. Connect the light source to the ferrule assembly end. At this time, the optical signal is reflected by the 8° filter to the 37° filter, and then reflected by the 45° filter to the quad-receiving ROSA 2. Adjust the length and angle of the second frame to correct the optical path, so that the optical signal intensity reaches the optimal level for transmission to the quad-receiving ROSA 2. Use glue to fix the second frame to the metal housing. Perform X, Y, Z direction and angle coupling on the quad-receiving ROSA 2 to achieve optimal RSSI coupling. Then, use laser welding to weld the quad-receiving ROSA 2 and the quad-emitting TOSA active optical device assembly into one piece, forming a novel single-fiber quad-emitting quad-receiving BIDI optical device.

[0042] The four-emit TOSA 1 transmits optical signals, which pass through isolator 4 and 8° filter 10, and are then focused onto ferrule assembly 8 using LENS 9. The optical signal entering from ferrule assembly 8 is reflected by 8° filter 10 to 37° filter 6, then by 37° filter 6 to 45° filter 11, and finally reflected again by 45° filter 11 before being transmitted to the four-receiver ROSA 2. The working principles of both are as follows... Figure 2 As shown.

[0043] The structure of the second frame 12 of the present invention is as follows: Figure 3 As shown, the device includes a cylindrical body with a mounting slot for a 45° filter 11. A second lens mount 12, on which the 45° filter 11 is mounted, is inserted into a second lens mount mounting hole in a metal housing 13. Because the 8° and 37° planes on the first lens mount 5 are affected by machining precision, they may cause optical path misalignment. This can be addressed by adjusting the axial position of the second lens mount within the mounting hole or by rotating it counterclockwise as needed. Figure 4 (Left image) or rotate clockwise ( Figure 4 (See right image) to correct the optical path for coupling welding.

[0044] This invention integrates the functions of a four-transmit TOSA device and a four-receive ROSA device into one unit. Utilizing the light transmission and reflection capabilities of filters, it integrates the four transmitted and four received signals into a single optical fiber, simultaneously supporting both four-transmit TOSA and four-receive ROSA functions. This can save fiber optic resources, reduce cabling infrastructure costs, simplify network cabling, save installation space, and lower cabling costs.

Claims

1. A novel single-fiber four-transmitter four-receiver BIDI optical device, characterized in that: It includes a metal housing and a four-shot TOSA, a four-receiver ROSA, and a ferrule assembly welded together with the metal housing. A first frame and a second frame are set inside the metal housing. An 8° filter, a 37° filter, and lenses are set on the first frame, and a 45° filter is set on the second frame.

2. The novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: The four TOSAs are laser-welded together with the metal housing via a TOSA adjustment ring.

3. A novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 2, characterized in that: An isolator is installed within the TOSA control loop.

4. The novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: The ferrule assembly is laser-welded together with the metal housing via a ferrule adjusting ring.

5. A novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: The four ROSA units are laser-welded together with the metal housing via ROSA adjustment rings.

6. A novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: The 8° filter, 37° filter, and lenses are bonded to the first frame using a baking adhesive process, and the first frame is bonded to the metal housing using the same process.

7. A novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: The second frame includes a cylindrical body and a 45° filter mounting slot opened on the cylindrical body.

8. A novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 7, characterized in that: The 45° filter is installed in the 45° filter mounting slot of the second frame.

9. A novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: The second frame is coupled and bonded to the metal housing.

10. A packaging process for the novel single-fiber four-transmitter four-receiver BIDI optical device according to claim 1, characterized in that: Includes the following steps: Step 1: Attach the isolator to the TOSA adjusting ring using a baking adhesive process; Step 2: Laser weld the TOSA adjustment ring to the four-electrode TOSA; Step 3: Sequentially glue the 8° filter, 37° filter, and lenses to the first frame using a baking adhesive process; then glue the first frame to the metal housing using the same process. Step 4: Weld the four-electrode TOSA and ferrule assembly to the metal housing using laser welding to obtain the four-electrode TOSA active optical device assembly. 1) Place the ferrule assembly inverted position into the clamp under the coupling table, fix and lock it. Place the metal housing on the ferrule assembly and fix and lock it. Place the four-electrode TOSA into the clamp on the coupling table. Couple the metal housing and the four-electrode TOSA in the X, Y and Z directions through the coupling table to optimize the power coupling of the four channels. Use laser welding process to weld the four-electrode TOSA to the metal housing as one piece. 2) Place the welded quad-electrode TOSA and metal housing into the lower fixture of the coupling stage, and place the ferrule assembly into the upper fixture of the coupling stage. Use the ferrule adjustment ring to connect and couple the X, Y, and Z directions to optimize the power coupling of the four channels. Use laser welding technology to weld the ferrule assembly to the metal housing with the welded quad-electrode TOSA to obtain the quad-electrode TOSA active optical device assembly. Step 5: Cycle the four-electrode TOSA active optical device assembly assembled in Step 4 between -40℃ and 85℃. Step 6: Weld the ROSA adjustment ring to the four ROSA units using laser welding. Step 7: Place the quad-emitting TOSA active optical device assembly, which has undergone temperature cycling in Step 5, into the coupling fixture for fixation. Attach the 45° filter to the second lens frame, and then install the second lens frame into the metal housing. Fix the quad-receiving ROSA with the ROSA adjustment ring welded on it onto the movable coupling fixture. Connect the light source to the ferrule assembly end. At this time, the optical signal is reflected by the 8° filter to the 37° filter, and then reflected by the 45° filter to the quad-receiving ROSA. Adjust the axial installation position and angle of the second lens frame to correct the optical path, so that the optical signal intensity reaches the optimal level for transmission to the quad-receiving ROSA. Use glue to fix the second lens frame to the metal housing. Perform X, Y, Z direction and angle coupling on the quad-receiving ROSA to optimize RSSI coupling. Then, use laser welding to weld the quad-receiving ROSA and the quad-emitting TOSA active optical device assembly into one piece, forming a novel single-fiber quad-emitting quad-receiving BIDI optical device.

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