Three-mode OLT optical device

Abstract

The utility model belongs to the field of optical fiber communication, and discloses a three-mode OLT optical device, which comprises a shell, an insertion core connected with the shell, a transmitting tube core, a receiving tube core and an optical element arranged in the shell, wherein the optical element comprises a filter plate group, and the filter plate group is respectively arranged on an optical path between the transmitting tube core and the insertion core and at a port of the receiving tube core; the full inverse wave plate group is arranged at a position opposite to the port of the receiving tube core; the filter group is matched with the total inverse wave plate group, optical signals transmitted by the transmitting tube core are guided into an insertion core, and optical signals transmitted by the insertion core are guided into a receiving tube core; according to the three-mode OLT optical device provided by the invention, the filter plate group and the total inverse wave plate group are adopted to guide optical signals, so that the occupied volume of the optical device is small, and the three-mode OLT optical device is suitable for dense wiring and high-density circuit board design.

Description

Technical Field

[0001] The utility model belongs to the field of optical fiber communication, and more specifically, particularly relates to a three-mode OLT optical device. Background Art

[0002] With the digital transformation of the industry, the increase in broadband penetration and the deepening of broadband speed-up, gigabit services and application scenarios are constantly enriched, and gigabit optical networks are extending from the consumer field to the vertical industry field. The digital transformation of thousands of industries has put forward more demands and higher requirements for optical access networks; as the first hop entry of "connection + computing power + capability", gigabit optical access networks need to comprehensively improve the basic network capabilities such as bandwidth, latency and determinism of optical access networks, and integrate network perception and network slicing capabilities; the development and industrial maturity of 50G-PON technology provide an important solution for this; compared with XGS-PON, 50G-PON technology is the next generation of optical access network system. Compared with XGS-PON, its physical layer rate is increased by 5 times, and the latency is reduced through single-frame multi-burst and dedicated registration windowing technology. The new features such as large bandwidth and low latency achieved by 50G-PON technology can fully meet the requirements of new business scenarios such as 8K, XR, industrial Internet, and industry digitalization for network access capabilities in the future, and can adapt to the needs of future network application development, so as to make technical reserves and accumulate important experience for the realization of 10G access to homes.

[0003] The existing 50G-PON network adopts a three-mode Combo PON solution. The OLT (Optical Line Termina l) of Combo PON is a six-port optical device that integrates three sets of transceiver cores in one optical device, and sets two groups of Z-BLOCK type wavelength division multiplexing components to combine and couple to the output optical port; in this technical solution, the optical path in the optical device is relatively complex, and the Z-BLOCK type wavelength division multiplexing component transceiver core adopts TO packaging, so the overall optical device will be very large and is not suitable for high-density wiring and high-density circuit board design; if the transceiver adopts a smaller BOX packaging form, the process accuracy requirements are high, the stability is not as good as the TO packaging form, and the manufacturing cost is high, rework is difficult, and it is difficult to meet the needs of 50G-PON networks. Utility Model Content

[0004] The utility model aims to solve the technical problems of large size and high manufacturing cost of optical devices in the prior art, and proposes a three-mode OLT optical device.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A three-mode OLT optical device comprises: a housing, a ferrule connected to the housing, a transmitting tube core, a receiving tube core and an optical element arranged in the housing;

[0007] Wherein, the optical element comprises: a filter group, which is respectively arranged on the optical path between the transmitting tube core and the ferrule and at the port of the receiving tube core;

[0008] A total reflection wave plate group, wherein the total reflection wave plate group is arranged at a position opposite to the port of the receiving tube core; the filter group cooperates with the total reflection wave plate group to guide the optical signal emitted by the transmitting tube core to the ferrule, and guide the optical signal emitted by the ferrule to the receiving tube core.

[0009] Furthermore, the transmitting tube core includes: a first transmitting port, the first transmitting port and the ferrule are respectively arranged on two opposite sides of the housing; a straight main optical path is between the first transmitting port and the ferrule, which is used to transmit the downlink optical signal emitted by the transmitting tube core and the uplink optical signal emitted by the ferrule;

[0010] a second launch port, the second launch port being disposed on the upper surface of the housing and close to the first launch port;

[0011] A third launch port is disposed on the lower surface of the housing and is close to the first launch port.

[0012] Further, the receiving tube core includes: a first receiving port, which is arranged on the upper surface of the housing and close to the ferrule;

[0013] A second receiving port, the second receiving port is arranged on the lower surface of the housing and close to the ferrule;

[0014] A third receiving port is disposed on the lower surface of the housing and is located between the third transmitting port and the second receiving port.

[0015] Further, the filter set includes: a first filter, which is arranged on the main optical path and located directly above the third emission port, and is used to guide the optical signal emitted by the third emission port to the ferrule;

[0016] A second filter, the second filter is arranged on the main optical path and is located directly below the second emission port, and is used to guide the optical signal emitted by the second emission port to the ferrule;

[0017] a third filter, the third filter being arranged obliquely above the third receiving port;

[0018] A fourth filter, the fourth filter is arranged obliquely above the third receiving port; the fourth filter cooperates with the third filter and the total reflection wave plate group to guide the uplink optical signal to the third receiving port;

[0019] a fifth filter, the fifth filter being horizontally arranged just above the third receiving port and being used for transmitting an optical signal of a specified wavelength to the third receiving port;

[0020] a sixth filter, the sixth filter being obliquely disposed below the first receiving port; the sixth filter cooperating with the fourth filter and the total reflection wave plate group to guide the uplink optical signal to the first receiving port and the second receiving port;

[0021] a seventh filter, the seventh filter being disposed between the first receiving port and the sixth filter and configured to transmit an optical signal of a specified wavelength to the first receiving port;

[0022] An eighth filter, the eighth filter is arranged above the second receiving port, and is used for transmitting the optical signal of the specified wavelength to the second receiving port.

[0023] Further, the total reflection wave plate group includes: a first total reflection wave plate, which is arranged above the fifth filter and is used to reflect the uplink optical signal to the third receiving port;

[0024] A second total reflection wave plate; the second total reflection wave plate is arranged obliquely below the fourth filter; and is used to reflect the uplink optical signal toward the first receiving port.

[0025] Furthermore, the first transmitting port is a 50G-1342nm-EML+SOA laser; the second transmitting port is a 10G-1577nm-EML aspheric short focal length laser; and the third transmitting port is a 2.5G-1490nm-DFB laser.

[0026] Furthermore, the first receiving port is a 25G-1286nm-APD photodetector; the second receiving port is a 10G-1270nm-APD photodetector; and the third receiving port is a 1.25G-1310nm-APD photodetector.

[0027] Furthermore, a lens group for converting the vergence of the optical signal is fixed in the housing.

[0028] Furthermore, the second receiving port is fixed on the housing at an inclined angle that matches the sixth filter.

[0029] The beneficial effects of the utility model are:

[0030] The present application provides a three-mode OLT optical device that supports three-mode compatibility of 50G-PON, XGS-PON and GPON. Three generations of PON coexist on the same optical device. After the network is deployed once, users can upgrade terminals on demand, which reduces the replacement cost, enables smooth evolution of services, and realizes high-speed, high-bandwidth data transmission; and a filter group and a full-reflection wave plate group are used in the optical device to guide the light path, so that the optical device occupies a small volume and is suitable for dense wiring and high-density circuit board design. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the overall structure of a three-mode OLT optical device provided in an embodiment of the utility model;

[0032] Figure 2 A schematic diagram of the internal structure of a three-mode OLT optical device provided in an embodiment of the utility model;

[0033] Figure 3 This is a schematic diagram of the position of the optical element in the housing in the embodiment of the utility model;

[0034] Figure 4 The present invention provides a three-mode OLT optical device optical path schematic diagram.

[0035] The markings in the figure are as follows:

[0036] 1. Shell;

[0037] 2. Insert core;

[0038] 3. Transmitter die;

[0039] 31, first transmitting port; 32, second transmitting port; 33, third transmitting port;

[0040] 4. Receiver die;

[0041] 41, first receiving port; 42, second receiving port; 43, third receiving port;

[0042] 5. Optical components;

[0043] 51. Filter group; 511. First filter; 512. Second filter; 513. Third filter; 514. Fourth filter; 515. Fifth filter; 516. Sixth filter; 517. Seventh filter; 518. Eighth filter; 52. Total reflection wave plate group; 521. First total reflection wave plate; 522. Second total reflection wave plate; 53. Lens group; 531. First lens; 532. Second lens; 533. Third lens; 534. Fourth lens; 535. Fifth lens; 541. First optical isolator; 542. Second optical isolator. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0045] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0048] Example

[0049] Figures 1 to 4 The embodiment of the present application shown provides a three-mode OLT optical device, which is connected to the optical port or fiber interface card slot of the device in actual application to provide the device with high-speed fiber optic transmission capability, and includes: a housing 1, a core 2, a transmitting tube core 3, a receiving tube core 4 and an optical element 5.

[0050] See also Figure 1 and Figure 2 The shell 1 is a rectangular parallelepiped structure as a whole, and an accommodating cavity 11 is provided inside along the length direction. A plurality of mounting holes are provided on the surface of the shell 1, which are respectively used to fix the ferrule 2, the transmitting tube core 3, and the receiving tube core 4; the axes of the plurality of mounting holes are located in the same plane and are connected with the accommodating cavity 11, so that the light beams emitted by the ferrule 2 and the transmitting tube core 3 are also in the same plane, simplifying the optical path; as an embodiment of the present application, the number of mounting holes is designed to be seven, of which one mounting hole located on the side of the shell 1 is used to fix the ferrule 2, three mounting holes located on the upper and lower surfaces of the shell 1 and close to the ferrule 2 are used to fix the receiving tube core 4, and the remaining three mounting holes are used to fix the transmitting tube core 3, so as to meet the needs of coexistence of three generations of PON.

[0051] To meet the needs of coexistence of three generations of PON, the ferrule 2 adopts a single-fiber multi-directional ferrule adapter, which can couple the lasers emitted by multiple transmitting tube cores 3 into the same optical fiber, or couple the lasers transmitted from the same optical fiber to multiple receiving tube cores 4 respectively, receive the downstream wavelengths of GPON, XGS-PON, and 50G-PON systems, and emit upstream wavelengths of three bands.

[0052] In the above technical scheme, the transmitting tube core 3 includes: a first transmitting port 31, a second transmitting port 32 and a third transmitting port 33; wherein, the first transmitting port 31 is arranged in the mounting hole on the side of the shell 1 and is arranged opposite to the ferrule 2. With this technical scheme, the optical signal emitted by the first transmitting port 31 can be directly emitted into the ferrule 2; the second transmitting port 32 is arranged in the mounting hole on the upper surface of the shell 1 and is close to the first transmitting port 31; the third transmitting port 33 is arranged in the mounting hole on the lower surface of the shell 1 and is close to the first transmitting port 31; the optical signals emitted by the second transmitting port 32 and the third transmitting port 33 are emitted into the ferrule 2 after adjustment by the optical element 5; with this technical scheme, the optical device in the present application is provided with three transmitting ports, which can be used to complete the transmission tasks of the downstream bands of the GPON, XGS-PON and 50G-PON systems respectively.

[0053] The receiving tube core 4 includes: a first receiving port 41, a second receiving port 42 and a third receiving port 43; wherein, the first receiving port 41 is arranged in a mounting hole on the upper surface of the shell 1 close to the ferrule 2, the second receiving port 42 is arranged in a mounting hole on the lower surface of the shell 1 close to the ferrule 2, and the third receiving port 43 is located on the lower surface of the shell 1 and fixed in the mounting hole between the third transmitting port 33 and the second receiving port 42; the optical signal emitted by the ferrule 2 is adjusted by the optical element 5 and respectively emitted into the first receiving port 41, the second receiving port 42, and the third receiving port 43; adopting this technical solution, the optical device in the present application is provided with three receiving ports, which can be used to complete the receiving tasks of the upstream band of the GPON, XGS-PON, and 50G-PON systems respectively.

[0054] See also Figures 2 to 4 The optical element 5 can be fixed inside the shell 1 by gluing, and includes: a filter group 51 and a total reflection wave plate group 52; the filter group 51 can pass the light signal of the specified wavelength and reflect the light signals of the other wavelengths, mainly playing a filtering role, and the total reflection wave plate group 52 can reflect the light signals of all wavelengths, mainly playing a role of changing the wavelength transmission direction, and the filter group 51 and the total reflection wave plate group 52 cooperate to guide the light signal emitted by the transmitting tube core 3 to the ferrule 2, and guide the light signal emitted by the ferrule 2 to the receiving tube core 4.

[0055] More specifically, the filter group 51 includes: a first filter 511, a second filter 512, a third filter 513, a fourth filter 514, a fifth filter 515, a sixth filter 516, a seventh filter 517 and an eighth filter 518; wherein the first filter 511 is arranged at an inclination angle of 45° on the direct main optical path and is located directly above the third transmitting port 33; so that the optical signal emitted by the first transmitting port 31 can pass through the first filter 511, and the optical signal emitted by the third transmitting port 33 is reflected by the first filter 511 and emitted in the direction of the ferrule 2; it can be understood that the inclination angle of the first filter 511 can also be adjusted according to the change of the positional relationship between the third transmitting port 33 and the first filter 511, so that the optical signal emitted by the third transmitting port 33 is reflected in the direction of the ferrule 2.

[0056] The second filter 512 is arranged at an inclination angle of 45° on the straight main optical path and is located directly below the second transmitting port 32; the second filter 512 can pass the optical signals emitted from the first transmitting port 31 and the third transmitting port 33, so that the optical signal emitted from the second transmitting port 32 is reflected by the second filter 512 and emitted in the direction of the ferrule 2; it is understandable that the inclination angle of the second filter 512 can also be adjusted according to the change of the positional relationship between the second transmitting port 32 and the second filter 512, so that the optical signal emitted from the second transmitting port 32 is reflected in the direction of the ferrule 2.

[0057] The third filter 513 and the fourth filter 514 are respectively arranged at an angle obliquely above the third receiving port 43; the fifth filter 515 is a light-transmitting filter, which is horizontally arranged just above the third receiving port 43 and below the third filter 513 and the fourth filter 514; in the above technical solution, the third filter 513 and the fourth filter 514 can pass the optical signals emitted by the first transmitting port 31, the second transmitting port 32, and the third transmitting port 33, and the third filter 513, the fourth filter 514 and the total reflection wave plate group 52 cooperate to guide part of the wavelength optical signals emitted by the ferrule 2 to the third receiving port 43; the design of the fifth filter 515 can filter out other wavelength optical signals and retain the specified wavelength optical signals to be transmitted to the third receiving port 43.

[0058] The sixth filter 516 is fixed obliquely below the first receiving port 41; the optical signal of a part of the wavelength emitted by the ferrule 2 is reflected by the fourth filter 514 and the total reflection wave plate group 52 and then emitted to the sixth filter 516, and the sixth filter 516 transmits the optical signal of the specified wavelength and reflects the optical signal of the remaining wavelength to the second receiving port 42;

[0059] The seventh filter 517 is a light-transmitting filter, which is horizontally fixed just below the first receiving port 41 and above the sixth filter 516 . The seventh filter 517 is designed to filter out other wavelength optical signals and retain the specified wavelength optical signal to be transmitted into the first receiving port 41 .

[0060] The eighth filter 518 is a light-transmitting filter, which is fixed above the second receiving port 42 and is used to filter out optical signals of other wavelengths and retain the optical signals of the specified wavelength to be transmitted into the first receiving port 41 .

[0061] The total reflection wave plate group 52 includes: a first total reflection wave plate 521 and a second total reflection wave plate 522; wherein the first total reflection wave plate 521 is tilted and fixed above the third filter 513, the fourth filter 514, and the fifth filter 515; the first total reflection wave plate 521 is used to reflect the optical signal reflected by the third filter 513 again, so that it is emitted to the third receiving port 43.

[0062] The second total reflection wave plate 522 is fixed obliquely below the fourth filter 514 . The second total reflection wave plate 522 is used to reflect the optical signal reflected by the fourth filter 514 again to direct it toward the second receiving port 42 .

[0063] The optical element 5 in the three-mode OLT optical device provided in the present application utilizes a filter group 51 and a full reflection wave plate group 52 to cooperate with the guided light signal. Compared with the prior art of setting up multiple groups of Z-BLOCK wavelength division multiplexing components inside the optical device, the internal structure is more compact and the optical path is simpler, so that the optical device occupies a smaller volume and is more suitable for high-density wiring and high-density circuit board design.

[0064] As a preferred embodiment of the present application, the second receiving port 42 is tilted at a small angle on the metal shell 1, and is used to cooperate in receiving the optical signal reflected by the sixth filter 516, so that the optical signal reflected by the sixth filter 516 can be directly emitted into the second receiving port 42; the optical signal received and sent by the ferrule 2 is split by the tilted filter group 51 and the total reflection wave plate group 52 on the optical path inside the shell 1, which can form effective isolation between the 50G-PON, XGS-PON, and GPON optical paths and reduce crosstalk between optical signals.

[0065] As a preferred embodiment of the present application, the first transmitting port 31 is a transmitting port of a 50G-PON system, which adopts a 50G-1342nm-EML+SOA laser (1342SOA EML TO) for transmitting a 1342nm wavelength optical signal for the downstream of 50G-PON, which can meet the high power requirements; the second transmitting port 32 is a transmitting port of an XGS-PON system, which adopts a 10G-1577nm-EML aspheric short focal length laser (1577EML TO) for transmitting a 1577nm wavelength optical signal for the downstream of XGS-PON, and the third transmitting port 33 is a transmitting port of a GPON system, which adopts a 2.5G-1490nm-DFB laser (1490DFB) for transmitting a 1490nm wavelength optical signal for the downstream of GPON.

[0066] The first receiving port 41 is a receiving port of the 50G-PON system, which adopts a 25G-1286nm-APD photodetector (25G APD TO) for receiving the 1286nm wavelength optical signal of the 50G-PON upstream; the second receiving port 42 is a receiving port of the XGS-PON system, which adopts a 10G-1270nm-APD photodetector (10G APD TO) for receiving the 1270nm wavelength optical signal of the XGS-PON upstream; the third receiving port 43 is a receiving port of the GPON system, which adopts a 1.25G-1310nm-APD photodetector (1.25G APD TO), used to receive the 1310nm wavelength optical signal of GPON upstream; the 1.25G-1310nm-APD photodetector is a small-size tube cap package, which further reduces the external dimensions of the receiving tube core 4 and is suitable for QSFP and SFP module packaging; in the above technical scheme, the receiving tube core 4 adopts a flat window TO package. Compared with the BOX packaging form, this scheme has lower manufacturing cost and avoids the deviation of the TO-CAN capping process, which can effectively improve the coupling efficiency index of the optical device.

[0067] It can be understood that in the above technical solution, the first filter 511 only transmits light signals with a wavelength of 1342nm; the second filter 512 only transmits light signals with wavelengths of 1342nm and 1490nm; the third filter 513 only transmits light signals with wavelengths of 1342nm, 1490nm, and 1577nm; the fourth filter 514 only transmits light signals with wavelengths of 1342nm, 1490nm, 1577nm, and 1310nm; the fifth filter 515 only transmits light signals with a wavelength of 1310nm; the sixth filter 516 and the seventh filter 517 only transmit light signals with a wavelength of 1286nm; and the eighth filter 518 only transmits light signals with a wavelength of 1270nm.

[0068] As a preferred embodiment of the present application, a lens group 53 is fixed in the housing 1, and the lens group 53 includes: a first lens 531, a second lens 532, a third lens 533, a fourth lens 534 and a fifth lens 535; wherein the first lens 531 is located on the main optical path between the second filter 512 and the third filter 513, and is used to convert the convergent optical signals of the three wavelengths of 1342nm, 1490nm and 1577nm into parallel light beams to extend the optical path; the second lens 532 is located at the port of the ferrule 2, and is used to align the ferrule 2 converts the optical signal received and sent; the third lens 533 is located between the sixth filter 516 and the first receiving port 41; the fourth lens 534 is located between the eighth filter 518 and the second receiving port 42; the fifth lens 535 is located between the fifth filter 515 and the third receiving port 43; the combination of the receiving tube core 4 and the lens group 53 can avoid the deviation of the tube core capping process and improve the coupling efficiency index; and the design of the lens group 53 can also effectively solve the problem that the optical path of the ferrule 2 and the transmitting tube core 3 is short and the optical signal is not easy to enter the receiving tube core 4.

[0069] In this embodiment, a first optical isolator 541 and a second optical isolator 542 are fixed in the shell 1; wherein, the first optical isolator 541 is located between the first emission port 31 and the first filter 511, and the second optical isolator 542 is located between the second emission port 32 and the second filter 512; the first optical isolator 541 and the second optical isolator 542 are arranged to reduce the light reflected back to the emission tube core 3, so as to reduce the noise and nonlinear distortion of the laser, and avoid adverse effects on the light source or the optical path system; this technical solution helps to reduce the power loss caused by stimulated Brillouin scattering and prevent reflected light from affecting the stability of the system.

[0070] Working principle:

[0071] According to the network selection needs, when using a 50G-PON single-fiber bidirectional data link, the 1342SOA EML TO drives and sends out a 50G optical signal. The optical signal passes through the first optical isolator 541 (allowing forward light to pass and reverse light to be isolated), passes through the filter group 51 and the lens group 53 of a specific wavelength in the forward direction, and reaches the optical fiber of the ferrule 2 to be converted into an electrical signal for output; the upstream rate corresponding to 50G-PON is 24.8832Gbps. When the optical device receives the 1286nm optical signal transmitted from the ferrule 2, the optical path is switched through the reflection of the fourth filter 514 and the second total reflection wave plate 522, and the transmission of the sixth filter 516 and the seventh filter 517, and reaches the 25GAPD TO to be converted into an electrical signal. This optical signal is compatible with 12.4416Gbps.

[0072] According to the network selection needs, when the XGS-PON single-fiber bidirectional data link in the device is used, the 1577EML TO driver sends out a 10G optical signal, and the optical signal passes through the second optical isolator 542 (allowing forward light to pass and reverse light to be isolated), passes through the filter group 51 and the lens group 53 of a specific wavelength in the forward direction, and reaches the optical fiber of the ferrule 2 to be converted into an electrical signal for output; the upstream rate corresponding to XGS-PON is 9.95328 / 2.48832Gbps. When the optical device receives the 1270nm optical signal transmitted from the ferrule 2, the optical path is switched through the reflection of the fourth filter 514, the second total reflection wave plate 522, and the sixth filter 516, and the transmission of the eighth filter 518, and reaches the 10G APD TO to be converted into an electrical signal.

[0073] According to the network selection needs, when using the GPON single-fiber bidirectional data link, the 1490DFB driver sends out a 2.5G optical signal, which passes through the filter group 51 and the lens group 53 of a specific wavelength in the forward direction, and is converted into an electrical signal when it reaches the optical fiber of the ferrule 2; the corresponding uplink rate of GPON is 1.24416Gbps. When the optical device receives the 1310nm optical signal from the ferrule 2, the optical path is switched through the transmission of the fourth filter 514 and the fifth filter 515 by the device, and the reflection of the third filter 513 and the first total reflection wave plate 521, and reaches the 1.25G APD TO to be converted into an electrical signal; the above 50G-PON, XGS-PON, and GPON three-mode optical / electrical-optical conversion function optical devices solve various network application needs in different markets.

[0074] The present application provides a three-mode OLT optical device that supports three-mode compatibility of 50G-PON, XGS-PON and GPON. Three generations of PON coexist on the same optical device. After the network is deployed once, users can upgrade terminals on demand, which reduces the replacement cost, enables smooth evolution of services, and realizes high-speed, high-bandwidth data transmission; and a filter group 51 and a full-reflection wave plate group 52 are used in the optical device to guide the optical signal, so that the optical device occupies a small volume and is suitable for dense wiring and high-density circuit board design.

[0075] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A three-mode OLT optical device, characterized in that: include: A housing (1), a core (2) connected to the housing (1), a transmitting tube core (3), a receiving tube core (4), and an optical element (5) arranged in the housing (1); The optical element (5) comprises: a filter group (51), wherein the filter group (51) is respectively arranged on the optical path between the transmitting tube core (3) and the ferrule (2) and at the port of the receiving tube core (4); A total reflection wave plate group (52), wherein the total reflection wave plate group (52) is arranged at a position opposite to the port of the receiving tube core (4); the filter group (51) cooperates with the total reflection wave plate group (52) to guide the optical signal emitted by the transmitting tube core (3) to the plug core (2), and to guide the optical signal emitted by the plug core (2) to the receiving tube core (4).

2. A three-mode OLT optical device according to claim 1, characterized in that: The transmitting tube core (3) comprises: a first transmitting port (31), wherein the first transmitting port (31) and the insert core (2) are respectively arranged on two opposite sides of the housing (1); a straight main optical path is formed between the first transmitting port (31) and the insert core (2), and is used to transmit a downlink optical signal emitted by the transmitting tube core (3) and an uplink optical signal emitted by the insert core (2); A second launch port (32), the second launch port (32) being arranged on the upper surface of the housing (1) and close to the first launch port (31); A third launching port (33), the third launching port (33) being arranged on the lower surface of the housing (1) and close to the first launching port (31).

3. A three-mode OLT optical device according to claim 2, characterized in that: The receiving tube core (4) comprises: a first receiving port (41), the first receiving port (41) being arranged on the upper surface of the housing (1) and close to the insert core (2); A second receiving port (42), the second receiving port (42) being arranged on the lower surface of the housing (1) and close to the ferrule (2); A third receiving port (43), the third receiving port (43) is arranged on the lower surface of the housing (1) and is located between the third transmitting port (33) and the second receiving port (42).

4. A three-mode OLT optical device according to claim 3, characterized in that: The filter group (51) comprises: a first filter (511), the first filter (511) being arranged on the main optical path and located directly above the third emission port (33), and being used for guiding the optical signal emitted by the third emission port (33) to the ferrule (2); a second filter (512), the second filter (512) being arranged on the main optical path and located directly below the second emission port (32), and being used for directing the optical signal emitted by the second emission port (32) to the ferrule (2); A third filter (513), the third filter (513) being arranged obliquely above the third receiving port (43); a fourth filter (514), the fourth filter (514) being arranged obliquely above the third receiving port (43); the fourth filter (514) cooperates with the third filter (513) and the total reflection wave plate group (52) to guide the uplink optical signal to the third receiving port (43); a fifth filter (515), the fifth filter (515) being horizontally arranged just above the third receiving port (43) and being used for transmitting an optical signal of a specified wavelength to the third receiving port (43); a sixth filter (516), the sixth filter (516) being arranged obliquely below the first receiving port (41); the sixth filter (516) cooperates with the fourth filter (514) and the total reflection wave plate group (52) to guide the uplink optical signal to the first receiving port (41) and the second receiving port (42); a seventh filter (517), the seventh filter (517) being arranged between the first receiving port (41) and the sixth filter (516), and being used for transmitting an optical signal of a specified wavelength to the first receiving port (41); An eighth filter (518), the eighth filter (518) is arranged above the second receiving port (42), and is used to transmit the optical signal of the specified wavelength to the second receiving port (42).

5. A three-mode OLT optical device according to claim 4, characterized in that: The total reflection wave plate group (52) comprises: a first total reflection wave plate (521), the first total reflection wave plate (521) being arranged above the fifth filter (515) and being used for reflecting the uplink optical signal toward the third receiving port (43); A second total reflection wave plate (522); the second total reflection wave plate (522) is arranged obliquely below the fourth filter (514); and is used to reflect the uplink optical signal toward the first receiving port (41).

6. A three-mode OLT optical device according to claim 2, characterized in that: The first emission port (31) is a 50G-1342nm-EML+SOA laser; the second emission port (32) is a 10G-1577nm-EML aspheric short focal length laser; and the third emission port (33) is a 2.5G-1490nm-DFB laser.

7. A three-mode OLT optical device according to claim 3, characterized in that: The first receiving port (41) is a 25G-1286nm-APD photodetector; the second receiving port (42) is a 10G-1270nm-APD photodetector; and the third receiving port (43) is a 1.25G-1310nm-APD photodetector.

8. The three-mode OLT optical device according to claim 1, characterized in that: A lens group (53) for converting the vergence of light signals is fixed in the housing (1).

9. A three-mode OLT optical device according to claim 4, characterized in that: The second receiving port (42) is fixed on the housing (1) at an inclined angle that matches the sixth filter plate (516).

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