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

Abstract

The invention 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, and light outlets of three groups of emitting lasers are opposite to three light inlets of the wave combiner in a one-to-one correspondence manner; light inlets of the three groups of receiving detectors are opposite to 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 present invention relates to the field of optical communication technology, and in particular to a BOX-packaged single-fiber three-transmitter and three-receiver optical device with built-in optical combining and splitting devices. Background Art

[0002] The current 10G PON OLT at the central office of the PON access network has passed its peak deployment period. According to market forecasts, the next three years will be a transition period from 10G PON to 50G PON. It is expected that 50G PON will begin mass-scale commercial deployment in 2026.

[0003] In the deployment of 50G PON, it is necessary to be compatible with the three-mode transmission of the three-generation PON (the three-generation PON is GPON, 10G PON and 50G PON), that is, to meet the transmission requirements of three different wavelengths for both upstream and downstream. The existing traditional PON optical devices have only single-fiber one-transmit and two-receive transmission channels, single-fiber two-transmit and one-receive transmission channels, or single-fiber two-transmit and two-receive transmission channels, which cannot meet the three-mode transmission requirements of 50G PON. Therefore, it is necessary to design a single-fiber three-transmit and three-receive optical device that can simultaneously meet the above transmission requirements.

[0004] In addition, as the market gradually becomes clear about the positioning of optoelectronic products, miniaturization and increased system technology integration density have become symbols of the progress of optoelectronic products. Although there are some optical components with three transmitters and three receivers in the existing technology, there are very few types, mainly due to the increase in the number and types of parts, the layout and assembly are complicated, the production cost is increased, and the product size will inevitably increase and occupy space. Summary of the invention

[0005] To solve the above problems, the present invention provides a BOX-packaged single-fiber three-transmitter and three-receiver optical device with a reasonable structure and built-in optical combining and splitting devices, thereby effectively increasing the optical port density and greatly improving the maximum rate without changing the existing networking structure, supporting the coexistence of three generations of PON, and effectively reducing the cost of access network service deployment.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A BOX-packaged single-fiber three-transmitter and three-receiver device with a built-in optical combiner and splitter comprises a BOX shell, wherein a combiner and a splitter are arranged in parallel on the left and right sides of the BOX shell, and three groups of transmitting lasers and three groups of receiving detectors are respectively installed in the BOX shells located behind the combiner and the splitter, and the light outlets of the three groups of transmitting lasers correspond to the three light inlets of the combiner, and the light inlets of the three groups of receiving detectors correspond to the three light outlets of the splitter; an optical fiber adapter is installed on the front wall of the BOX shell in front of the light inlet of the splitter; and the BOX shell also comprises a beam splitter prism, which comprises an A surface and a B surface arranged in parallel on the left and right sides, and the combined light emitted by the combiner is reflected by the A surface and the B surface in turn and then converged to the optical fiber adapter, and the light input by the optical fiber adapter enters the light inlet of the splitter after passing through the B surface.

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

[0009] The combiner has three light input ports arranged along the left and right directions at the rear, and the transmitting lasers include a first transmitting laser, a second transmitting laser, and a third transmitting laser arranged along the left and right directions; the splitter has three light output ports arranged along the left and right directions at the rear, and the receiving detectors include a first receiving detector, a second receiving detector, and a third receiving detector arranged along the left and right directions.

[0010] The three light inlets at the rear of the combiner are respectively adhered with filter one, and the three light outlets at the rear of the splitter are respectively adhered with filter two.

[0011] A lens 1 is arranged between the optical filter 1 and the transmitting laser; a lens 2 is arranged between the optical filter 2 and the receiving detector.

[0012] 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, and lens 1 and lens 2 are arranged on the same straight line along the left-right direction inside the BOX shell.

[0013] The A surface of the beam splitter prism is located in front of the light outlet of the combiner, and an isolator is arranged between the combiner and the beam splitter prism; the B surface of the beam splitter prism is located between the light inlet of the splitter and the optical fiber adapter.

[0014] A window is provided on the front wall of the BOX shell, a fiber optic adapter is welded on the outside of the window, a ferrule end lens is installed on the inside of the window, and the ferrule end lens is located between the B surface of the beam splitter prism and the fiber optic adapter.

[0015] The A surface and the B surface are arranged at 45 degrees. The A surface reflects the front-to-back horizontal light emitted by the combiner and turns it 90 degrees into the left-to-right horizontal light, and then reflects the left-to-right horizontal light and turns it 90 degrees into the front-to-back horizontal light through the B surface.

[0016] The dichroic prism comprises a prism 1 and a prism 2. The prism 1 is provided with an A surface and a B surface which are arranged relatively parallel. A surface C is connected between the A surface and the B surface. The C surface forms an angle of 45° with the A surface. The prism 2 is provided with a B surface and a D surface which intersect at an angle of 45°. After the B surface of the prism 2 is attached to the B surface of the prism 1, the C surface and the D surface are parallel to each other or located in the same plane.

[0017] The combiner and splitter both use Z-Block components.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The single-fiber three-transmitter and three-receiver device of the present invention has the combiner, splitter and other components built into the same BOX shell, and is cleverly integrated and laid out without increasing the size of the device, effectively increasing the optical port density, greatly improving the maximum rate and product reliability, and does not change the existing networking structure, supporting the coexistence of three generations of PON, and effectively reducing the deployment cost of access network services;

[0020] The present invention also includes the following advantages:

[0021] By placing the combiner and splitter side by side in the BOX shell, single-fiber three-way transmission and three-way reception can be achieved, which improves and ensures the overall integration while effectively reducing the overall length of the device. It is especially suitable for environments with limited length but low width requirements.

[0022] The single-fiber three-transmitter and three-receiver optical device in the present invention can meet the 50G PON three-mode transmission requirements, and can also be applied to other application scenarios requiring single-fiber three-transmitter and three-receiver. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] Figure 2 Schematic diagram of the optical path of the present invention.

[0025] Figure 3 Schematic diagram of the beam splitter prism of the present invention.

[0026] Among them: 1. BOX shell; 3. Combiner; 4. Isolator; 5. Beam splitter; 6. Ferrule end lens; 7. Fiber optic adapter; 8. Splitter;

[0027] 11. Window;

[0028] 20. Lens 1; 21. First emitting laser; 22. Second emitting laser; 23. Third emitting laser;

[0029] 31. Filter 1;

[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. DETAILED DESCRIPTION

[0033] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0034] like Figure 1 and Figure 2 As shown, a BOX-packaged single-fiber three-transmitter and three-receiver device with a built-in optical combiner and splitter device in this embodiment includes a BOX shell 1, in which a combiner 3 and a splitter 8 are arranged side by side on the left and right sides. Three groups of transmitting lasers and three groups of receiving detectors are installed in the BOX shell 1 behind the combiner 3 and behind the splitter 8, respectively. The light outlets of the three groups of transmitting lasers correspond to the three light inlets of the combiner 3, and the light inlets of the three groups of receiving detectors correspond to the three light outlets 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 splitter 8. It also includes a beam splitter prism 5, such as Figure 3 As shown, 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 converged 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 input port of the splitter 8.

[0035] The single-fiber three-transmitter and three-receiver optical device of this embodiment has the combiner 3, the splitter 8 and other components built into the same BOX shell 1, and has a clever integrated layout without increasing the size of the device. By placing the combiner 3 and the splitter 8 side by side in the BOX shell 1, a single-fiber three-transmitter and three-receiver is achieved, which improves and ensures the overall integration while effectively reducing the overall length of the device. It is particularly suitable for environments with limited length and low width requirements.

[0036] In this embodiment, the combiner 3 and the splitter 8 are arranged in parallel on the left and right, and combined with the beam splitter prism 5, three transmissions and three receptions are realized, the transmission end optical path and the reception end optical path are effectively separated, and the crosstalk between the transmission and reception optical paths is effectively avoided.

[0037] In this embodiment, the BOX shell 1 can be airtight or non-airtight.

[0038] Three light input ports are arranged along the left and right directions at the rear of the combiner 3, and the transmitting lasers include a first transmitting laser 21, a second transmitting laser 22, and a third transmitting laser 23 arranged along the left and right directions; three light output ports are arranged along the left and right directions at the rear of the splitter 8, and the receiving detectors include a first receiving detector 91, a second receiving detector 92, and a third receiving detector 93 arranged along the left and right directions.

[0039] The three light inlets at the rear of the combiner 3 are respectively adhered with filter pieces 1 31 , and the three light outlets at the rear of the splitter 8 are respectively adhered with filter pieces 2 81 .

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

[0041] A lens 20 is arranged between the filter 1 31 and the transmitting laser; a lens 2 90 is arranged between the filter 2 81 and the receiving detector.

[0042] In this embodiment, the lights emitted by the three emitting lasers are collimated into three parallel lights by corresponding lenses 20 , and then combined into one parallel light by the combiner 3 .

[0043] 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 , and lens 1 20 and lens 2 90 are arranged on the same straight line along the left-right direction inside the BOX shell 1 .

[0044] The A surface 53 of the beam splitter 5 is located in front of the light outlet of the combiner 3 , and the isolator 4 is arranged between the combiner 3 and the beam splitter 5 ; the B surface 54 of the beam splitter 5 is located between the light inlet of the splitter 8 and the optical fiber adapter 7 .

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

[0046] A window 11 is provided on the front wall of the BOX housing 1 , a fiber optic adapter 7 is welded to the outside of the window 11 , a ferrule end lens 6 is installed to 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 fiber optic adapter 7 .

[0047] In this embodiment, the converged light emitted by the optical fiber adapter 7 is collimated into parallel light by the ferrule end lens 6 , and then passes through the beam splitter prism 5 and is split into three paths of light by the wave splitter 8 .

[0048] The A surface 53 and the B surface 54 are arranged at 45 degrees. The A surface 53 reflects the horizontal light in the front-to-back direction emitted by the combiner 3 and turns it 90 degrees into horizontal light in the left-to-right direction. The B surface 54 then reflects the horizontal light in the left-to-right direction and turns it 90 degrees into horizontal light in the front-to-back direction, thereby realizing the optical path from the emitting laser to the optical fiber adapter 7.

[0049] The beam splitter prism 5 includes 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 surface 53 and B surface 54 are connected with a C surface 55, and an angle of 45° is formed between the C surface 55 and the A surface 53. The prism 2 52 is provided with a B surface 54 and a D surface 56 which intersect with each other at 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.

[0050] The beam splitter 5 located in the optical path at the transmitting end, the light combined by the combiner 3 is incident toward the C surface 55, and then reflected by the A surface 53 and the B surface 54 in sequence and emitted to the optical fiber adapter 7; the beam splitter 5 located in the optical path at the receiving end, the light input by the optical fiber adapter 7 passes through the B surface 54 and then exits from the D surface 56, and is incident on the light inlet of the splitter 8.

[0051] In actual operation, in order to prevent reflection, the beam splitter prism 5 is placed at a slight tilt, so that the C-plane 55 as the incident plane is tilted 1-8 degrees relative to the combined light beam on the basis of vertical incidence.

[0052] The combiner 3 and the splitter 8 both adopt conventional Z-Block components.

[0053] The Z-Block component used in this embodiment meets the wavelength requirements of 50G PON; of course, Z-Block components of other wavelengths can also be selected to be applied to other application scenarios that require single-fiber three-transmit and three-receive.

[0054] In this embodiment, the use of the Z-Block component helps to realize an integrated and compact three-transmitter and three-receiver optical device, effectively simplifies the optical path structure, and ensures the optical path transmission efficiency.

[0055] The single-fiber three-transmitter and three-receiver optical device in this embodiment has an optical port density increased by 50% and a maximum rate increased by 5 times, which can meet the 50G PON three-mode transmission requirements and can also be applied to other application scenarios requiring single-fiber three-transmitter and three-receiver.

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

[0057] In this embodiment, the combiner 3, the splitter 8, the beam splitter prism 5 and other components are integrated into the same BOX shell, realizing the integration of transmission and reception, effectively improving the integration level, and the packaging process is completed inside the shell, which can effectively reduce the production cost and is conducive to mass production; at the same time, the optical fiber adapter 7 is welded and installed at the window 11 of the BOX shell 1 to form a single-fiber three-transmitter and three-receiver device packaged by a single BOX.

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

[0059] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0060] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

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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