Optical devices and optical communication systems

Abstract

This invention belongs to the field of communication equipment technology, specifically relating to an optical device and an optical communication system, used to solve the technical problem of limited application due to the small wavelength spacing between the transmitter and receiver. The optical device includes a housing with a first connection port, a second connection port, and a third connection port. The first connection port is connected to a receiver, the second connection port is connected to a transmitter, and the third connection port is connected to an adapter. A plano-concave lens, a first filter, and a first plano-convex lens are sequentially arranged between the transmitter and the adapter. A second filter and a second plano-convex lens are sequentially arranged between the first filter and the receiver. The first light beam in the transmitter is collimated by the plano-concave lens, and the second light beam in the adapter is collimated by the first plano-convex lens, making the first light beam transmitted through the first filter and the second light beam reflected by the first filter parallel or approximately parallel, further reducing the wavelength spacing and thus expanding the application range of the optical device.

Description

Technical Field

[0001] The present invention relates to the field of communication equipment technology, and in particular to an optical device and an optical communication system. Background Technology

[0002] With the development of communication technology, optical communication has been widely used due to its advantages such as high bandwidth, long transmission distance, and high communication speed. Optical communication is a communication method that uses light waves as carriers. Optical communication systems typically include optical devices, which are connected to optical fibers through adapters. The optical devices are used to convert optical signals into electrical signals and transmit optical signals through coupling with optical fibers.

[0003] Optical devices typically consist of a transmitter and a receiver, which use different optical wavelengths. The light wave from the transmitter propagates into an optical fiber, and the light wave in the optical fiber travels to the receiver, enabling bidirectional transmission of optical signals over a single fiber. However, the wavelength gap between the transmitter and receiver in traditional bidirectional optical devices is at least 20 nm, which limits their application range. Summary of the Invention

[0004] In view of the above problems, embodiments of the present invention provide an optical device and an optical communication system for reducing the optical wavelength interval between the transmitter and the receiver, and expanding the application range of the optical device.

[0005] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0006] A first aspect of the present invention provides an optical device comprising: a housing having a first connection port, and a second connection port and a third connection port disposed opposite to each other, the first connection port being connected to a receiver, the second connection port being connected to a transmitter, and the third connection port being connected to an adapter;

[0007] A plano-concave lens, an optical isolator, a first filter, and a first plano-convex lens are sequentially disposed between the transmitter and the adapter. A second filter and a second plano-convex lens are sequentially disposed between the first filter and the receiver. The second filter is located on the side of the second plano-convex lens away from the receiver.

[0008] The first beam from the transmitter is collimated by the plano-concave lens, transmitted through the optical isolator, transmitted through the first filter, and focused by the first plano-convex lens before entering the adapter. The second beam from the adapter is collimated by the first plano-convex lens, reflected by the first filter, transmitted through the second filter, and focused by the second plano-convex lens before entering the receiver.

[0009] In some possible embodiments, the second filter is located directly below the receiver and perpendicular to the optical path of the receiver, and the angle between the first filter and the second filter is 45°.

[0010] In some possible embodiments, the plano-concave lens is a C-Lens lens;

[0011] And / or, the first plano-convex lens is a C-Lens lens;

[0012] And / or, the second plano-convex lens is a C-Lens lens.

[0013] In some possible embodiments, the transmitter operates in the 1281-1297nm band, and the receiver operates in the 1306-1322nm band.

[0014] Alternatively, the transmitter may operate in the 1306-1322nm band, and the receiver may operate in the 1281-1297nm band.

[0015] In some possible embodiments, the transmitter is a TO-can package structure;

[0016] And / or, the receiver is a TO-can package structure.

[0017] In some possible embodiments, a first filter holder and a second filter holder are also provided inside the housing, and both the first filter holder and the second filter holder are connected to the housing;

[0018] The first filter holder is equipped with the first filter, and the second filter holder is equipped with the second filter.

[0019] In some possible embodiments, the optical device further includes a sealed tube body, a lens tube body, and an adjustment ring;

[0020] The transmitter is fixedly connected to the sealing tube body and to the lens tube body through the adjusting ring. The lens tube body is inserted into the second connection port. The plano-concave lens is installed inside the lens tube body, and the curved surface of the plano-concave lens is concave to the optical isolator.

[0021] In some possible embodiments, the adapter is inserted into the third connection port, the adapter has a first through hole, the first through hole has a ferrule inside, and the first plano-convex lens is also inserted into the end of the first through hole near the third connection port, the curved surface of the first plano-convex lens convex toward the first filter.

[0022] In some possible embodiments, the housing is further provided with a stepped hole communicating with the second connection port, the optical isolator is disposed in the stepped hole and limited by the stepped surface of the stepped hole, the polarization direction of the optical isolator is consistent with the polarization direction of the transmitter, and the angle between the crystal medium of the optical isolator and the first filter is a preset value to perform coaxial polarization correction on the optical path;

[0023] And / or, the optical device further includes a lens ring inserted into the first connection port, the lens ring having a second through hole, a second plano-convex lens disposed in the second through hole, the receiver being connected to the side of the lens ring away from the first connection port, and the curved surface of the second plano-convex lens convex toward the first filter.

[0024] The optical device provided in the embodiments of the present invention has at least the following advantages:

[0025] In the optical device provided in this embodiment of the invention, a plano-concave lens, an optical isolator, a first filter, and a first plano-convex lens are sequentially arranged between the receiver and the adapter. A second filter and a second plano-convex lens are sequentially arranged between the first filter and the receiver. The plano-concave lens collimates the first beam in the transmitter into parallel or approximately parallel light. The collimated first beam is transmitted through the optical isolator and the first filter, and then focused by the first plano-convex lens before entering the adapter. The first plano-convex lens collimates the second beam in the adapter into parallel or approximately parallel light. The collimated second beam is reflected by the first filter, then transmitted through the second filter, and focused by the second plano-convex lens before entering the receiver. Through the above arrangement, the first beam transmitted by the first filter and the second beam reflected by the first filter are parallel or approximately parallel light, and their wavelength spacing can be reduced to 11 nm. This allows the wavelength spacing between the transmitter and the receiver to be reduced to 11 nm, thereby expanding the application range of the optical device.

[0026] A second aspect of the present invention provides an optical communication system comprising the optical devices described above, and thus has at least the advantage of wide application range. The specific effects are as described above and will not be repeated here.

[0027] In addition to the technical problems solved by the embodiments of the present invention, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions as described above, other technical problems that can be solved by the optical devices and optical communication systems provided by the embodiments of the present invention, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific embodiments. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the overall structure of the optical device in an embodiment of the present invention;

[0030] Figure 2 This is a cross-sectional view of the optical device in an embodiment of the present invention;

[0031] Figure 3 This is an exploded view of the optical device in an embodiment of the present invention;

[0032] Figure 4 This is an exploded cross-sectional view of the optical device in an embodiment of the present invention.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10-Housing shell; 11-First connection port;

[0035] 12 - Second connection port; 13 - Third connection port;

[0036] 21-First filter; 22-Second filter;

[0037] 31-Transmitter; 32-Sealed tube body;

[0038] 33-Adjusting ring; 34-Lens tube body;

[0039] 35 - Plano-concave lens; 36 - Optical isolator;

[0040] 41-Adapter; 42-Merging pin;

[0041] 43 - First plano-convex lens; 51 - Receiver;

[0042] 52 - Lens ring; 53 - Second plano-convex lens. Detailed Implementation

[0043] Optical devices in related technologies suffer from a limitation in application due to the minimum wavelength gap between the transmitter and receiver (at least 20 nm). The inventors discovered that optical devices typically employ wavelength division multiplexing (WDM) technology to separate optical signals of different wavelengths, enabling bidirectional transmission over a single fiber. These devices generally include a housing, transmitter, receiver, 45-degree filter, and adapter with a ferrule. Light from the transmitter passes through the 45-degree filter and enters the adapter, while light from the optical fiber is reflected by the same filter before entering the receiver. The minimum 20 nm wavelength gap between the transmitted and reflected light from the 45-degree filter necessitates a minimum 20 nm wavelength gap between the transmitter and receiver, thus limiting the development of transceiver optical devices with a wavelength gap below 20 nm.

[0044] In view of this, embodiments of the present invention provide an optical device and an optical communication system. A plano-concave lens, a first filter, and a first plano-convex lens are sequentially arranged between the receiver and the adapter of the optical device. A second filter and a second plano-convex lens are sequentially arranged between the first filter and the receiver, with the second filter located on the side of the second plano-convex lens furthest from the receiver. The plano-concave lens collimates the first beam in the transmitter into parallel or approximately parallel light. The collimated first beam is transmitted through an optical isolator and the first filter, and then focused by the first plano-convex lens before entering the adapter. The first plano-convex lens collimates the second beam in the adapter into parallel or approximately parallel light. The collimated second beam is reflected by the first filter, then transmitted through the second filter, and focused by the second plano-convex lens before entering the receiver. Through the above arrangement, the first beam transmitted by the first filter and the second beam reflected by the first filter are parallel or approximately parallel light, and their wavelength spacing can be reduced to 11 nm. This reduces the optical wavelength spacing between the transmitter and the receiver to 11 nm, thereby expanding the application range of the optical device.

[0045] To make the above-mentioned objectives, features, and advantages of the embodiments of the present invention more apparent and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] The first aspect of this invention provides an optical device, see below. Figures 1 to 4The optical device may include a housing 10, a receiver 51, a transmitter 31, and an adapter 41. The housing 10 provides support and protection, the transmitter 31 emits a first light beam, the adapter 41 has a ferrule 42 connected to an optical fiber, the adapter 41 receives the first light beam and a second light beam incident in the transmission optical fiber, and the receiver 51 receives the second light beam.

[0047] Preferably, the operating wavelength of the transmitter 31 includes 1281-1297nm, and the operating wavelength of the receiver 51 includes 1306-1322nm. That is, the wavelength range of the first beam emitted by the transmitter 31 is 1281-1297nm, and the wavelength range of the second beam incident through the optical fiber in the adapter 41 is 1306-1322nm. Alternatively, the operating wavelength range of the transmitter 31 includes 1306-1322nm, and the operating wavelength range of the receiver 51 includes 1281-1297nm. That is, the wavelength range of the first beam emitted by the transmitter 31 is 1306-1322nm, and the wavelength range of the second beam incident through the optical fiber in the adapter 41 is 1281-1297nm.

[0048] Furthermore, in a scenario where two optical devices communicate with each other, one transmitter 31 operates in the 1281-1297nm wavelength range, and the receiver 51 operates in the 1306-1322nm wavelength range. The other transmitter 31 operates in the 1306-1322nm wavelength range, and the receiver 51 operates in the 1281-1297nm wavelength range. The reduced wavelength spacing between transmitters 31 and receivers 51, coupled with the achievement of bidirectional transmission in the zero-dispersion region of the optical fiber, further reduces the wavelength spacing requirements of the optical devices, broadening their application range and enabling high-speed, long-distance bidirectional transmission over a single fiber.

[0049] In some possible embodiments, the housing 10 can be made of metal to facilitate connection between the housing 10 and the transmitter 31, receiver 51, adapter 41, etc., such as by soldering. The transmitter 31 can be a TO-can (TransistorOutline Can) package, and / or the receiver 51 can be a TO-can package, that is, at least one of the transmitter 31 and the receiver 51 can be a TO-can package. The TO-can package is a mature and easy-to-use structure.

[0050] The adapter 41 includes an adapter body, a ferrule 42, and an optical fiber. The adapter body has a first through hole, and the ferrule 42 is located inside the first through hole. For example, the ferrule 42 is interference-fitted with the first through hole, and the optical fiber is connected to the end of the ferrule 42. The ferrule 42 can be made of ceramic.

[0051] Continue reading Figures 1 to 4The housing 10 has a first connection port 11, a second connection port 12, and a third connection port 13. The first connection port 11 is connected to a receiver 51, the second connection port 12 is connected to a transmitter 31, and the third connection port 13 is connected to an adapter 41. The second connection port 12 and the third connection port 13 are positioned opposite each other. For example,... Figure 4 As shown, the first connection port 11 is located on the top of the housing 10, while the second connection port 12 and the third connection port 13 are respectively located on the left and right sides of the housing 10. This arrangement allows the transmitter 31 and the adapter 41 to face each other, and the optical axis of the transmitter 31 can coincide with the optical axis of the adapter 41, forming a straight optical path between them. This allows the adapter 41 to better receive the first beam emitted by the transmitter 31. The optical axis of the transmitter 31 refers to the optical axis of the insert 42 within the transmitter 31.

[0052] In this embodiment of the invention, a plano-concave lens 35, an optical isolator 36, a first filter 21 and a first plano-convex lens 43 are sequentially arranged between the transmitter 31 and the adapter 41. A second filter 22 and a second plano-convex lens 53 are sequentially arranged between the first filter 21 and the receiver 51. The second filter 22 is located on the side of the second plano-convex lens 53 away from the receiver 51.

[0053] That is, along the direction between the transmitter 31 and the adapter 41, the plano-concave lens 35, the optical isolator 36, the first filter 21, and the first plano-convex lens 43 are sequentially arranged; along the direction from the first filter 21 to the receiver 51, the second filter 22 and the second plano-convex lens 53 are sequentially arranged. For example, as shown... Figure 2 As shown in the diagram, the transmitter 31, plano-concave lens 35, optical isolator 36, first filter 21, and first plano-convex lens 43 are arranged sequentially from left to right, while the first filter 21, second filter 22, and receiver 51 are arranged sequentially from bottom to top.

[0054] Specifically, the plano-concave lens 35 is roughly cylindrical, with one end face being flat and the other curved. Its focal length is negative, and the curved surface of the plano-concave lens 35 is concave towards the emitter 31. This configuration minimizes the reflection of the first beam emitted by the emitter 31 by the flat surface of the plano-concave lens 35. Furthermore, the curved surface of the concave lens collimates the first beam emitted by the emitter 31, making it parallel or approximately parallel. This allows the first beam within the housing 10 to transmit as parallel or approximately parallel light, resulting in higher transmission and coupling efficiency in the optical path. This fully utilizes the energy of the first beam and reduces optical path losses. Approximately parallel light means the beam's emission angle is small, for example, less than 1 degree, allowing the first beam emitted by the emitter 31 to be a focused laser beam.

[0055] Optical isolator 36 is used to isolate light traveling in the opposite direction from light traveling in the forward direction, thereby enabling unidirectional light propagation. Specifically, such as... Figure 2 and Figure 4 As shown, a stepped hole is provided inside the housing 10. The stepped hole is close to and communicates with the second connection port 12. The shape of the optical isolator 36 is adapted to the shape of the large hole section of the stepped hole so that the optical isolator 36 is placed in the stepped hole and limited by the stepped surface formed by the large hole section and the small hole section of the stepped hole.

[0056] Optical isolator 36 typically includes a polarizer, an analyzer, and a crystal medium. The crystal medium is usually a magneto-optical crystal, such as yttrium iron garnet (YIG) or bismuth iron garnet (BIG). The polarization direction of optical isolator 36 is consistent with the polarization direction of transmitter 31, meaning that the polarization direction allowed by optical isolator 36 is the same as that of transmitter 31, allowing the first beam emitted by transmitter 31 to pass through. The angle between the crystal medium of optical isolator 36 and the first filter 21 is a preset value, for example, approximately 52°, to perform coaxial polarization correction on the optical path, ensuring a straight optical path.

[0057] The first plano-convex lens 43 is generally cylindrical, with one end face being flat and the other curved. Its focal length is positive, and the curved surface of the first plano-convex lens 43 convexes towards the first filter 21. This configuration serves two purposes: firstly, the first plano-convex lens 43 converges the first beam of parallel or approximately parallel light transmitted through the first filter 21, directing it into the adapter 41 and the optical fiber connected to the adapter 41, thereby improving the coupling efficiency of the optical device; secondly, the second beam of light incident from the optical fiber onto the adapter 41 is divergent, and the first plano-convex lens 43 collimates it into parallel or approximately parallel light, ensuring that the second beam within the housing 10 is transmitted as parallel or approximately parallel light. This results in higher transmission and coupling efficiency in the optical path, fully utilizing the energy of the second beam and reducing optical path loss.

[0058] By using the plano-concave lens 35 and the first plano-convex lens 43, the light reflected and transmitted by the first filter 21 is made parallel or approximately parallel. The wavelength interval between the reflected and transmitted light from the first filter 21 can be further reduced, for example, as low as 11 nm. In other words, the wavelength interval between the first beam and the second beam can be further reduced, thereby expanding the application range of the optical device. In addition, the coupling efficiency between the transmitter 31 and the receiver 51 can be improved, thereby increasing the responsivity, sensitivity, and output optical power of the optical device, while reducing the process difficulty of the coupling process and thus improving production efficiency.

[0059] The second plano-convex lens 53 is generally cylindrical, with one end face being a plane and the other end face being a curved surface. Its focal length is positive, and the curved surface of the second plano-convex lens 53 convexes towards the first filter 21. The second plano-convex lens 53 converges the parallel light or approximately parallel light beam reflected by the first filter 21 and transmitted by the second filter 22, so that the focused second light beam is incident on the receiver 51.

[0060] In some possible embodiments, the plano-concave lens 35 is a C-Lens (Conventional Lens); and / or, the first plano-convex lens 43 is a C-Lens lens; and / or, the second plano-convex lens 53 is a C-Lens lens. That is, at least one of the plano-concave lens 35, the first plano-convex lens 43, and the second plano-convex lens 53 can be a C-Lens lens. A C-Lens lens is a thick lens with a constant refractive index, which has high refractive index and transmittance in the communication band of optical fiber, thus reducing the cost of optical devices and increasing their operating distance.

[0061] Based on the above embodiments, in one possible implementation, the plano-concave lens 35, the first plano-convex lens 43, and the second plano-convex lens 53 are all C-Lens lenses. C-Lens lenses have high transmittance, simple structure, are easy to manufacture, and have low cost, which can reduce the cost of optical devices. Of course, the types of plano-concave lens 35, the first plano-convex lens 43, and the second plano-convex lens 53 are not limited; at least one of the plano-concave lens 35, the first plano-convex lens 43, and the second plano-convex lens 53 can also be a GRIN-Lens (Gradient-index) lens, etc.

[0062] Continue reading Figures 1 to 4 The first filter 21 transmits the first light beam and reflects the second light beam, thereby enabling bidirectional optical signal transmission of the optical device. The second filter 22 filters out noise in the second light beam, and the second light beam after interference elimination is received by the receiver 51. The second filter 22 is located directly below the receiver 51 and perpendicular to the optical path of the receiver 51, with an angle of 45° between the first filter 21 and the second filter 22. Specifically, the second filter 22 can be a 0-degree filter, placed horizontally, and the first filter 21 can be a 45-degree filter, with an angle of 45° between the first filter 21 and the horizontal direction.

[0063] In order to fix the first filter 21 and the second filter 22, in one possible implementation, a first filter bracket and a second filter bracket are also provided inside the housing 10, and both the first filter bracket and the second filter bracket are connected to the housing 10; the first filter bracket is equipped with the first filter 21, and the second filter bracket is equipped with the second filter 22.

[0064] like Figure 2 and Figure 4 As shown, the first filter holder is placed horizontally, with its circumferential edge connected to the housing 10. The second filter holder is placed at an angle, with one end connected to the housing 10 and the other end connected to the first filter holder. The first filter 21 is bonded to the first filter holder, and the second filter 22 is bonded to the second filter holder. It is understood that both the first and second filter holders have light-transmitting holes, and the first filter 21 and the second filter 22 are located on these holes to ensure the continuity of the optical path.

[0065] In this embodiment of the invention, the first light beam in the transmitter 31 is collimated by the plano-concave lens 35, transmitted by the optical isolator 36, transmitted by the first filter 21, and focused by the first plano-convex lens 43 before entering the adapter 41. The second light beam in the adapter 41 is collimated by the first plano-convex lens 43, reflected by the first filter 21, transmitted by the second filter 22, and focused by the second plano-convex lens 53 before entering the receiver 51, thereby realizing bidirectional communication of the optical device.

[0066] Continue reading Figures 1 to 4 In some possible embodiments, the optical device further includes a sealing tube body 32, a lens tube body 34, and an adjustment ring 33, wherein the transmitter 31 is fixedly connected to the sealing tube body 32 and fixedly connected to the lens tube body 34 through the adjustment ring 33, the lens tube body 34 is inserted into the second connection port 12, and a plano-concave lens 35 is installed inside the lens tube body 34.

[0067] Specifically, such as Figure 2 As shown, the transmitter 31 abuts against one end of the sealed tube body 32 and passes through the cavity of the sealed tube body 32. The transmitter 31 and the sealed tube body 32 are welded together. The other end of the sealed tube body 32 is connected to the adjusting ring 33, and part of the transmitter 31 extends into the cavity of the adjusting ring 33. One end of the lens tube body 34 is inserted into the second connection port 12 of the housing 10, and the other end extends into the cavity of the adjusting ring 33. The lens tube body 34 can be welded to the housing 10, and to the adjusting ring 33. The lens tube body 34 has a third through hole, and the plano-concave lens 35 is bonded in the third through hole.

[0068] Continue reading Figures 1 to 4In some possible embodiments, the optical device further includes a lens ring 52, which is inserted into the first connection port 11. The lens ring 52 has a second through hole, and a second plano-convex lens 53 is disposed within the second through hole. A receiver 51 is connected to the side of the lens ring 52 away from the first connection port 11. Specifically, the lens ring 52 is partially inserted into the first connection port 11 and welded to the housing 10. The receiver 51 is bonded to the end of the lens ring 52 away from the first connection port 11. The lens ring 52 has a second through hole inside, which connects the first connection port 11 and the receiver 51. The second plano-convex lens 53 is bonded inside the second through hole.

[0069] It is understood that the optical device includes at least one of an optical isolator 36 and a lens ring 52. By setting the optical isolator 36, unidirectional light propagation can be achieved, meaning the first beam is transmitted from the transmitter 31 to the adapter 41, preventing the second beam in the adapter 41 from interfering with the transmitter 31. The lens ring 52 facilitates the installation and fixation of the second plano-convex lens 53 and the receiver 51. The optical device in this embodiment may include an optical isolator 36 and a lens ring 52 to improve the performance of the optical device.

[0070] Continue reading Figures 1 to 4 In some possible embodiments, the adapter 41 is inserted into the third connection port 13. The adapter 41 has a first through hole, and a ferrule 42 is disposed inside the first through hole. A first plano-convex lens 43 is also inserted into the end of the first through hole near the third connection port 13. The adapter 41 can be snap-fitted or interference-fitted with the housing 10, or it can be soldered to the housing 10. The connection method between the adapter 41 and the housing 10 is not limited in this embodiment of the invention.

[0071] The insert 42 can be located in the middle of the first through hole, and it can be interference-fitted with the first through hole. The first plano-convex lens 43 is located at one end of the first through hole, close to the first filter 21, and the first plano-convex lens 43 can be bonded to the first through hole with glue.

[0072] In summary, in this embodiment of the invention, the optical device sequentially comprises a plano-concave lens 35, a first filter 21, and a first plano-convex lens 43 between the receiver 51 and the adapter 41. A second filter 22 and a second plano-convex lens 53 are sequentially disposed between the first filter 21 and the receiver 51. The plano-concave lens 35 collimates the first beam in the transmitter 31 into parallel or approximately parallel light. After collimation, the first beam is transmitted through the optical isolator 36 and the first filter 21, and then focused by the first plano-convex lens 43 before entering the adapter 41. The first plano-convex lens 43 collimates the second beam in the adapter 41 into parallel or approximately parallel light. After collimation, the second beam is reflected by the first filter 21, then transmitted through the second filter 22, and focused by the second plano-convex lens 53 before entering the receiver 51. With the above configuration, the first light beam transmitted by the first filter 21 and the second light beam reflected are parallel or approximately parallel light, and their wavelength spacing can be reduced to 11 nm. This allows the optical wavelength spacing between the transmitter 31 and the receiver 51 to be reduced to 11 nm, thereby expanding the application range of optical devices. Furthermore, the above-mentioned optical devices can be manufactured according to the requirements of upright mounting processes during the design phase, thus solving the complex operations of common flip-chip mounting and improving production efficiency.

[0073] A second aspect of the present invention also provides an optical communication system that includes the optical devices described above, and thus has at least the advantages of the optical devices described above. The specific effects are as described above and will not be repeated here.

[0074] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0075] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the system or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting this invention.

[0076] In the description of this specification, references to "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An optical device, characterized in that, include: The housing has a first connection port, and a second connection port and a third connection port that are opposite to each other. The first connection port is connected to a receiver, the second connection port is connected to a transmitter, and the third connection port is connected to an adapter. A plano-concave lens, an optical isolator, a first filter, and a first plano-convex lens are sequentially disposed between the transmitter and the adapter. A second filter and a second plano-convex lens are sequentially disposed between the first filter and the receiver. The second filter is located on the side of the second plano-convex lens away from the receiver. The first beam in the transmitter is collimated by the plano-concave lens, transmitted by the optical isolator, transmitted by the first filter, and focused by the first plano-convex lens before entering the adapter. The second beam in the adapter is collimated by the first plano-convex lens, reflected by the first filter, transmitted by the second filter, and focused by the second plano-convex lens before entering the receiver. The plano-concave lens is cylindrical, with one end face being a plane and the other end face being a curved surface, the curved surface of the plano-concave lens being concave towards the emitter; the first plano-convex lens is cylindrical, with one end face being a plane and the other end face being a curved surface, the curved surface of the first plano-convex lens being convex towards the first filter.

2. The optical device according to claim 1, characterized in that, The second filter is located directly below the receiver and perpendicular to the optical path of the receiver, and the angle between the first filter and the second filter is 45°.

3. The optical device according to claim 1, characterized in that, The plano-concave lens is a C-Lens lens; And / or, the first plano-convex lens is a C-Lens lens; And / or, the second plano-convex lens is a C-Lens lens.

4. The optical device according to claim 1, characterized in that, The transmitter operates in the 1281-1297nm band, and the receiver operates in the 1306-1322nm band. Alternatively, the transmitter may operate in the 1306-1322nm band, and the receiver may operate in the 1281-1297nm band.

5. The optical device according to claim 1, characterized in that, The transmitter has a TO-can package structure; And / or, the receiver is a TO-can package structure.

6. The optical device according to any one of claims 1 to 5, characterized in that, The housing also includes a first filter holder and a second filter holder, both of which are connected to the housing. The first filter holder is equipped with the first filter, and the second filter holder is equipped with the second filter.

7. The optical device according to any one of claims 1 to 5, characterized in that, The optical device also includes a sealed tube body, a lens tube body, and an adjustment ring; The transmitter is fixedly connected to the sealing tube body and to the lens tube body through the adjusting ring. The lens tube body is inserted into the second connection port. The plano-concave lens is installed inside the lens tube body, and the curved surface of the plano-concave lens is concave to the optical isolator.

8. The optical device according to any one of claims 1 to 5, characterized in that, The adapter is inserted into the third connection port. The adapter has a first through hole with a ferrule inside. The first plano-convex lens is also inserted into the end of the first through hole near the third connection port. The curved surface of the first plano-convex lens convexes toward the first filter.

9. The optical device according to any one of claims 1 to 5, characterized in that, The housing is also provided with a stepped hole communicating with the second connection port. The optical isolator is disposed in the stepped hole and is limited by the stepped surface of the stepped hole. The polarization direction of the optical isolator is consistent with the polarization direction of the transmitter. The angle between the crystal medium of the optical isolator and the first filter is a preset value to perform coaxial polarization correction on the optical path. And / or, the optical device further includes a lens ring inserted into the first connection port, the lens ring having a second through hole, a second plano-convex lens disposed in the second through hole, the receiver being connected to the side of the lens ring away from the first connection port, and the curved surface of the second plano-convex lens convex toward the first filter.

10. An optical communication system, characterized in that, Includes the optical device as described in any one of claims 1 to 9.

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