BOX-packaged single-fiber three-transmitting and three-receiving optical device with built-in light combining and splitting device

Abstract

The utility model discloses a BOX-packaged single-fiber three-transmitting and three-receiving optical device with a built-in light combining and splitting device, which comprises a BOX shell, a wave combiner and a wave separator are arranged in the BOX shell side by side left and right, light outlets of three groups of transmitting lasers directly face three light inlets of the wave combiner in a one-to-one correspondence manner, and light inlets of three groups of receiving detectors directly face three light outlets of the wave separator in a one-to-one correspondence manner; an optical fiber adapter is mounted on the front wall surface of the BOX shell in front of the light inlet of the wave separator; the device further comprises a beam splitter prism, the beam splitter prism comprises a face A and a face B which are arranged in parallel left and right, combined light emitted by the combiner is sequentially reflected by the face A and the face B and then converged to the optical fiber adapter, and light input by the optical fiber adapter penetrates through the face B and then enters a light inlet of the wave splitter. Under the condition that the size of a device is not increased, ingenious integrated layout is carried out, the optical port density is effectively increased, the maximum rate and the product reliability are greatly improved, an existing networking structure is not changed, coexistence of three generations of PON is supported, and the service deployment cost of an access network is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of optical communication, in particular to a single-fiber triple-transmission and triple-reception optical device with an integrated optical splitting device and BOX packaging. Background Art

[0002] In the PON access network, the deployment peak of the 10G PON at the OLT side of the central office has passed. According to market forecasts, the next three years will be the transition period from 10G PON to 50G PON, and it is expected that 50G PON will start large-scale commercial deployment in 2026.

[0003] During the deployment of 50G PON, it is necessary to be compatible with the triple-mode transmission of three generations of PON (the three generations of PON are GPON, 10G PON, and 50G PON), that is, to meet the transmission requirements of three different wavelengths for both upstream and downstream. Existing traditional PON optical devices have only single-fiber single-transmission and double-reception, single-fiber double-transmission and single-reception, or single-fiber double-transmission and double-reception for the transmission channels, and cannot meet the triple-mode transmission requirements of 50G PON. Therefore, it is necessary to design a single-fiber triple-transmission and triple-reception optical device that can meet the above transmission requirements.

[0004] In addition, as the positioning of optoelectronic products in the market becomes gradually clear, the miniaturization of volume and the improvement of the system technology integration density have become symbols defining the progress of optoelectronic products. Although there are already individual integrated optical components with triple-transmission and triple-reception in the prior art, the types are very few, mainly limited by the increase in the number and categories of components, the cumbersome layout and assembly, which increase the production cost, and the volume of the product inevitably increases and occupies space. Summary of the Utility Model

[0005] To solve the above problems, the utility model provides a single-fiber triple-transmission and triple-reception optical device with an integrated optical splitting device and BOX packaging, which has a reasonable structure, can effectively increase the optical port density, greatly improve the maximum rate, and does not change the existing networking structure, supports the coexistence of three generations of PON, and effectively reduces the access network service deployment cost.

[0006] The technical solution adopted by the utility model is as follows:

[0007] A single-fiber triple-transmission and triple-reception optical device with an integrated optical multiplexer / demultiplexer in a BOX package, comprising a BOX housing. Inside the BOX housing, an optical multiplexer and an optical demultiplexer are arranged side by side from left to right. Inside the BOX housing behind the optical multiplexer and behind the optical demultiplexer, three groups of transmitting lasers and three groups of receiving detectors are respectively installed. The light output ports of the three groups of transmitting lasers are respectively and directly opposite to the three light input ports of the optical multiplexer, and the light input ports of the three groups of receiving detectors are respectively and directly opposite to the three light output ports of the optical demultiplexer. On the front wall surface of the BOX housing in front of the light input port of the optical demultiplexer, an optical fiber adapter is installed. It further includes a beam splitting prism. The beam splitting prism includes an A surface and a B surface arranged in parallel from left to right. The combined light beam emitted from the optical multiplexer is reflected by the A surface and the B surface in sequence and then converges to the optical fiber adapter. The light input from the optical fiber adapter passes through the B surface and then enters the light input port of the optical demultiplexer.

[0008] As a further improvement of the above technical solution:

[0009] Three light input ports are arranged in the left-right direction behind the optical multiplexer. The transmitting lasers include a first transmitting laser, a second transmitting laser, and a third transmitting laser arranged in the left-right direction. Three light output ports are arranged in the left-right direction behind the optical demultiplexer. The receiving detectors include a first receiving detector, a second receiving detector, and a third receiving detector arranged in the left-right direction.

[0010] A first filter is respectively adhered at the three light input ports behind the optical multiplexer, and a second filter is respectively adhered at the three light output ports behind the optical demultiplexer.

[0011] A first lens is arranged between the first filter and the transmitting laser; a second lens is arranged between the second filter and the receiving detector.

[0012] The three groups of transmitting lasers and the three groups of receiving detectors are arranged in a straight line in the left-right direction inside the BOX housing, and the first lens and the second lens are arranged in a straight line in the left-right direction inside the BOX housing.

[0013] In the beam splitting prism, the A surface is in front of the light output port of the optical multiplexer, and an isolator is arranged between the optical multiplexer and the beam splitting prism; in the beam splitting prism, the B surface is between the light input port of the optical demultiplexer and the optical fiber adapter.

[0014] A window is opened on the front wall surface of the BOX housing. An optical fiber adapter is welded on the outside of the window, and a ferrule end lens is installed on the inside of the window. The ferrule end lens is located between the B surface of the beam splitting prism and the optical fiber adapter.

[0015] The A surface and the B surface are arranged at 45°. The A surface reflects and deflects the horizontally polarized light in the front-back direction emitted from the optical multiplexer by 90° to convert it into horizontally polarized light in the left-right direction, and then the B surface reflects and deflects the horizontally polarized light in the left-right direction by 90° to convert it into horizontally polarized light in the front-back direction.

[0016] The beam splitting prism includes a first prism and a second prism. On the first prism, there are A surface and B surface arranged relatively parallel, and a C surface is connected between the A surface and the B surface, and a 45° angle is formed between the C surface and the A surface. On the second prism, there are B surface and D surface intersecting at a 45° angle; after the B surface of the second prism is attached to the B surface of the first prism, the C surface and the D surface are parallel to each other or in the same plane.

[0017] Both the multiplexer and the demultiplexer adopt Z-Block components.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] For the single-fiber triple-transmission and triple-reception optical device of the utility model, components such as the multiplexer and the demultiplexer are all internally arranged in the same BOX housing. Without increasing the size of the device, a clever integrated layout is carried out, effectively increasing the optical port density, greatly improving the maximum rate and product reliability, and without changing the existing networking structure, supporting the coexistence of three generations of PON, effectively reducing the access network service deployment cost;

[0020] The utility model also has the following advantages:

[0021] By arranging the multiplexer and the demultiplexer side by side inside the BOX housing, single-fiber triple-transmission and triple-reception are realized. While improving and ensuring the overall integration, the overall length size of the device is effectively reduced, especially suitable for environments with limited length and low width requirements.

[0022] The single-fiber triple-transmission and triple-reception optical device in the utility model can meet the requirements of 50G PON triple-mode transmission and can also be applied to other application scenarios requiring single-fiber triple-transmission and triple-reception. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the utility model.

[0024] Figure 2 It is a schematic optical path diagram of the utility model.

[0025] Figure 3 It is a schematic diagram of the beam splitting prism of the utility model.

[0026] Among them: 1. BOX housing; 3. Multiplexer; 4. Isolator; 5. Beam splitting prism; 6. Ferrule end lens; 7. Fiber optic adapter; 8. Demultiplexer;

[0027] 11. Window;

[0028] 20. First lens; 21. First emitting laser; 22. Second emitting laser; 23. Third emitting laser;

[0029] 31. First filter;

[0030] 51. Prism 1; 52. Prism 2; 53. Surface A; 54. Surface B; 55. Surface C; 56. Surface D

[0031] 81. Filter 2

[0032] 90. Lens 2; 91. First receiving detector; 92. Second receiving detector; 93. Third receiving detector Specific embodiments

[0033] The following combines with the attached drawings to illustrate the specific embodiments of the present utility model

[0034] As Figure 1 and Figure 2 shown, a single-fiber triple-transmission and triple-reception optical device with an integrated beam splitter device in a BOX package according to this embodiment includes a BOX housing 1. Inside the BOX housing 1, a wavelength division multiplexer 3 and a demultiplexer 8 are arranged side by side left and right. Three groups of transmitting lasers and three groups of receiving detectors are respectively installed in the BOX housing 1 behind the wavelength division multiplexer 3 and behind the demultiplexer 8. The light output ports of the three groups of transmitting lasers are respectively facing the three light input ports of the wavelength division multiplexer 3, and the light input ports of the three groups of receiving detectors are respectively facing the three light output ports of the demultiplexer 8; an optical fiber adapter 7 is installed on the front wall surface of the BOX housing 1 in front of the light input port of the demultiplexer 8; it also includes a beam splitting prism 5. As Figure 3 shown, the beam splitting prism 5 includes a surface A 53 and a surface B 54 arranged parallel to each other left and right. The combined beam of light emitted from the wavelength division multiplexer 3 is reflected by the surface A 53 and the surface B 54 in sequence and then converges to the optical fiber adapter 7. The light input from the optical fiber adapter 7 enters the light input port of the demultiplexer 8 after passing through the surface B 54

[0035] For the single-fiber triple-transmission and triple-reception optical device of this embodiment, components such as the wavelength division multiplexer 3 and the demultiplexer 8 are all internally arranged in the same BOX housing 1, and a clever integrated layout is carried out without increasing the device size; by arranging the wavelength division multiplexer 3 and the demultiplexer 8 side by side inside the BOX housing 1, single-fiber triple-transmission and triple-reception are realized. While improving and ensuring the overall integration degree, the overall length size of the device is effectively reduced, especially suitable for environments with limited length and low width requirements

[0036] In this embodiment, the wavelength division multiplexer 3 and the demultiplexer 8 are arranged side by side left and right, combined with the beam splitting prism 5, to realize triple-transmission and triple-reception, effectively separating the transmitting optical path and the receiving optical path, and effectively avoiding optical path crosstalk between transmission and reception

[0037] In this embodiment, the BOX housing 1 can be hermetically or non-hermetically packaged

[0038] There are three light input ports arranged in the left - right direction along the rear edge of the multiplexer 3. The transmitting lasers include the first transmitting laser 21, the second transmitting laser 22, and the third transmitting laser 23 arranged in the left - right direction. There are three light output ports arranged in the left - right direction along the rear edge of the demultiplexer 8. The receiving detectors include the first receiving detector 91, the second receiving detector 92, and the third receiving detector 93 arranged in the left - right direction.

[0039] Filter one 31 is respectively adhered at the three light input ports behind the multiplexer 3, and filter two 81 is respectively adhered at the three light output ports behind the demultiplexer 8.

[0040] In this embodiment, the filter is fixed to the multiplexer 3 or the demultiplexer 8 by bonding, which has high reliability and saves space and production costs.

[0041] A lens one 20 is arranged between filter one 31 and the transmitting laser; a lens two 90 is arranged between filter two 81 and the receiving detector.

[0042] In this embodiment, the light emitted by the three transmitting lasers is collimated into three parallel light beams by the corresponding lens one 20, and then combined into one parallel light beam by the multiplexer 3.

[0043] The three groups of transmitting lasers and the three groups of receiving detectors are arranged in a straight line along the left - right direction inside the BOX housing 1, and the lens one 20 and the lens two 90 are arranged in a straight line along the left - right direction inside the BOX housing 1.

[0044] In the beam - splitting prism 5, the A - surface 53 is located in front of the light output port of the multiplexer 3, and an isolator 4 is arranged between the multiplexer 3 and the beam - splitting prism 5; in the beam - splitting prism 5, the B - surface 54 is located between the light input port of the demultiplexer 8 and the fiber adapter 7.

[0045] In this embodiment, the isolator 4 is arranged outside the light output port of the multiplexer 3. The three light beams emitted by the transmitting lasers are combined into one collimated beam by the multiplexer 3, and the three transmitting lasers share one isolator 4.

[0046] A window 11 is opened on the front wall surface of the BOX housing 1. A fiber adapter 7 is welded outside the window 11, and a ferrule end lens 6 is installed inside the window 11. The ferrule end lens 6 is located between the B - surface 54 of the beam - splitting prism 5 and the fiber adapter 7.

[0047] In this embodiment, the converging light emitted by the fiber adapter 7 is collimated into parallel light by the ferrule end lens 6, and then passes through the beam - splitting prism 5 and is split into three light beams by the demultiplexer 8.

[0048] The A surface 53 and the B surface 54 are arranged at a 45° angle. The A surface 53 reflects and deflects the horizontally polarized light in the front and rear directions emitted from the multiplexer 3 by 90° to convert it into horizontally polarized light in the left and right directions, and then the B surface 54 reflects and deflects the horizontally polarized light in the left and right directions by 90° to convert it into horizontally polarized light in the front and rear directions, realizing the optical path from the transmitting laser to the fiber optic adapter 7.

[0049] The beam splitting prism 5 includes a prism 51 and a prism 52. On the prism 51, there are relatively parallel A surface 53 and B surface 54 arranged. Between the A surface 53 and the B surface 54, there is a C surface 55 connected. The C surface 55 forms a 45° angle with the A surface 53. On the prism 52, there are B surface 54 and D surface 56 intersecting at a 45° angle. After the B surface 54 of the prism 52 is attached to the B surface 54 of the prism 51, the C surface 55 and the D surface 56 are parallel to each other or in the same plane.

[0050] For the beam splitting prism 5 in the transmitting optical path, the light combined by the multiplexer 3 is incident on the C surface 55, and then is reflected by the A surface 53 and the B surface 54 in sequence and then emitted to the fiber optic adapter 7. For the beam splitting prism 5 in the receiving optical path, the light input from the fiber optic adapter 7 passes through the B surface 54 and then exits from the D surface 56 and is incident on the light input port of the demultiplexer 8.

[0051] In actual operation, to prevent reflection, the beam splitting prism 5 is placed slightly inclined, so that the C surface 55 as the incident surface is inclined 1-8° relative to the combined beam on the basis of perpendicular incidence.

[0052] Both the multiplexer 3 and the demultiplexer 8 adopt the existing conventional Z-Block components.

[0053] The Z-Block components adopted in this embodiment meet the wavelength requirements of 50G PON. Of course, Z-Block components with other wavelengths can also be selected for application in other application scenarios that require single-fiber triple transmission and triple reception.

[0054] In this embodiment, by using the Z-Block components, it helps to realize an integrated and compact triple transmission and triple reception optical device, effectively simplifies the optical path structure, and ensures the optical path transmission efficiency.

[0055] For the single-fiber triple transmission and triple reception optical device in this embodiment, the optical port density is increased by 50%, and the maximum rate is increased by 5 times. It can meet the requirements of 50G PON triple-mode transmission and can also be applied to other application scenarios that require single-fiber triple transmission and triple reception.

[0056] In actual use, for example, during the upgrade and transition stage from 2.5G or 10G PON to 50G PON, the wavelengths of the transmitting laser and the receiving detector can correspond to the communication wavelengths of 2.5G, 10G, and 50G PON respectively. For example, the wavelengths matched by the three-way transmitting lasers can be 1342nm, 1577nm, and 1490nm respectively, and the wavelengths matched by the three-way receiving detectors can be 1286nm, 1310nm, and 1270nm respectively.

[0057] In this embodiment, components such as the multiplexer 3, demultiplexer 8, and beam splitting prism 5 are all integrated and placed inside the same BOX housing, achieving the integration of transmission and reception, effectively improving and ensuring the integration level. The packaging process is completed inside the housing, which can effectively reduce the production cost and is conducive to mass production. At the same time, the fiber optic adapter 7 is welded and installed at the window 11 of the BOX housing 1 to form a single-fiber triple-transmitting and triple-receiving optical device packaged by a single BOX.

[0058] The utility model effectively increases the optical port density, greatly improves the maximum rate and product reliability, and does not change the existing network structure, supports the coexistence of three generations of PON, and effectively reduces the access network service deployment cost.

[0059] In this specification, each embodiment is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0060] The above description is an explanation of the utility model, not a limitation of the utility model. The scope defined by the utility model can be seen in the claims. Within the protection scope of the utility model, any form of modification can be made.

Claims

1. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices, characterized in that: The invention comprises a BOX shell (1), wherein a combiner (3) and a splitter (8) are arranged in parallel on the left and right sides of the BOX shell (1), and three groups of transmitting lasers and three groups of receiving detectors are respectively installed in the BOX shell (1) behind the combiner (3) and behind the splitter (8), wherein the light output ports of the three groups of transmitting lasers correspond to the three light input ports of the combiner (3), and the light input ports of the three groups of receiving detectors correspond to the three light output ports of the splitter (8); An optical fiber adapter (7) is installed on the front wall of the BOX shell (1) in front of the light inlet of the wave splitter (8); the optical fiber adapter (7) also includes a beam splitter prism (5), the beam splitter prism (5) includes an A surface (53) and a B surface (54) arranged in parallel on the left and right. The combined light emitted by the combiner (3) is reflected by the A surface (53) and the B surface (54) in sequence and then converges to the optical fiber adapter (7). The light input by the optical fiber adapter (7) passes through the B surface (54) and then enters the light inlet of the wave splitter (8).

2. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: The combiner (3) has three light inlets arranged in the left-right direction at the rear, and the transmitting lasers include a first transmitting laser (21), a second transmitting laser (22), and a third transmitting laser (23) arranged in the left-right direction; the splitter (8) has three light outlets arranged in the left-right direction at the rear, and the receiving detectors include a first receiving detector (91), a second receiving detector (92), and a third receiving detector (93) arranged in the left-right direction.

3. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: Optical filters 1 (31) are respectively adhered to the three light inlets at the rear of the combiner (3), and optical filters 2 (81) are respectively adhered to the three light outlets at the rear of the splitter (8).

4. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 3, characterized in that: A lens one (20) is arranged between the optical filter one (31) and the transmitting laser; and a lens two (90) is arranged between the optical filter two (81) and the receiving detector.

5. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 4, characterized in that: Three groups of transmitting lasers and three groups of receiving detectors are arranged on the same straight line along the left-right direction inside the BOX shell (1); lens 1 (20) and lens 2 (90) are arranged on the same straight line along the left-right direction inside the BOX shell (1).

6. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: The A surface (53) of the beam splitter prism (5) is located in front of the light outlet of the combiner (3), and an isolator (4) is arranged between the combiner (3) and the beam splitter prism (5); the B surface (54) of the beam splitter prism (5) is located between the light inlet of the splitter (8) and the optical fiber adapter (7).

7. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: A window (11) is provided on the front wall of the BOX shell (1), an optical fiber adapter (7) is welded to the outside of the window (11), a ferrule end lens (6) is installed on the inside of the window (11), and the ferrule end lens (6) is located between the B surface (54) of the beam splitter prism (5) and the optical fiber adapter (7).

8. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: The A surface (53) and the B surface (54) are arranged at 45 degrees. The A surface (53) reflects and folds the horizontal light in the front-to-back direction emitted by the combiner (3) by 90 degrees to convert it into horizontal light in the left-to-right direction, and then reflects and folds the horizontal light in the left-to-right direction by 90 degrees through the B surface (54) to convert it into horizontal light in the front-to-back direction.

9. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: The light splitting prism (5) comprises a prism 1 (51) and a prism 2 (52); the prism 1 (51) is provided with an A surface (53) and a B surface (54) which are arranged in parallel with each other; a C surface (55) is connected between the A surface (53) and the B surface (54); the C surface (55) and the A surface (53) form an angle of 45°; the prism 2 (52) is provided with a B surface (54) and a D surface (56) which intersect and form an angle of 45°; after the B surface (54) of the prism 2 (52) is attached to the B surface (54) of the prism 1 (51), the C surface (55) and the D surface (56) are parallel to each other or located in the same plane.

10. A BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices as claimed in claim 1, characterized in that: The combiner (3) and the splitter (8) both use Z-Block components.

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