CN212321833U - Optical transceiver system - Google Patents
Optical transceiver system Download PDFInfo
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- CN212321833U CN212321833U CN202021356041.1U CN202021356041U CN212321833U CN 212321833 U CN212321833 U CN 212321833U CN 202021356041 U CN202021356041 U CN 202021356041U CN 212321833 U CN212321833 U CN 212321833U
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Abstract
The application discloses optics receiving and dispatching system, this system include cassegrain telescope, light beam coupling module, light emission module and light receiving module, and the pending light of light emission module outgoing is the linear polarization, and the purpose of cooperation light beam coupling module realization outgoing light path and receiving light path coupling, and cassegrain telescope based on the same optical axis realizes light reception and light emission integration promptly. Simultaneously this card formula telescope's secondary mirror is including running through first through-hole wherein, the primary mirror is including running through second through-hole wherein, the central line of first through-hole and second through-hole is the optical axis of card formula telescope, emergent light and receipt light all can be through first through-hole and second through-hole transmission, avoided secondary mirror and primary mirror to the sheltering from and absorbing of emergent light and receipt light, be favorable to improving the SNR of emergent light and receipt light, and because the existence of first through-hole in the secondary mirror, the sheltering from of secondary mirror center to receipt light has been avoided, non-blind area detection has been realized.
Description
Technical Field
The present application relates to the field of optical technology, and more particularly, to an optical transceiver system.
Background
The optical transceiver system is an important part of the laser radar technology as a transmitting and receiving device of the laser radar signal.
The existing optical transceiving system is mainly divided into a discrete structure and an integrated structure, and in the optical transceiving system with the discrete structure, a transmitting optical system and a receiving optical system of the optical transceiving system are separately arranged; in the optical transceiving system with the integrated structure, the transmitting optical path and the receiving optical path share the same optical axis, that is, the transmitting optical system and the receiving optical system are integrated, and compared with a discrete structure system, the optical transceiving system has the characteristics of compact structure, large caliber and high stability.
However, the mainstream structure of the existing optical transceiving system with the turn-back integrated structure is an optical transceiving system based on a cassegrain telescope, and the optical transceiving system with the structure has energy loss, so that the problems of low signal-to-noise ratio of transmitted light and received light and blind areas in receiving are caused.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem, the application provides an optical transceiving system to improve the signal-to-noise ratio of emergent rays and received rays of the optical transceiving system and reduce the purpose of a receiving blind area.
In order to achieve the technical purpose, the embodiment of the application provides the following technical scheme:
an optical transceiver system comprising: the device comprises a Cassegrain telescope, a light beam coupling module, a light emitting module and a light receiving module; wherein the content of the first and second substances,
the Cassegrain telescope comprises a primary mirror and a secondary mirror which are oppositely arranged, the secondary mirror comprises a first through hole penetrating through the secondary mirror, the primary mirror comprises a second through hole penetrating through the primary mirror, the central connecting line of the first through hole and the second through hole is the optical axis of the Cassegrain telescope, and the primary mirror and the secondary mirror form an emergent light path and a receiving light path of the Cassegrain telescope;
the light emitting module is used for emitting light to be processed, and the light to be processed is linearly polarized light;
the light beam coupling module is used for reflecting and depolarizing light to be processed to form unpolarized emergent light and emitting the emergent light through the emergent light path; and a light receiving line for transmitting the received light returned from the receiving optical path to the light receiving module;
the light receiving module is used for processing the received light to obtain a detection signal corresponding to the received light.
Optionally, the light emitting module includes: a polarizing laser, a polarizing plate and a reflecting prism; wherein the content of the first and second substances,
the polarized laser is used for emitting the light to be processed to the polaroid;
the polaroid is used for analyzing and deflecting the light to be processed and transmitting the light to the reflecting prism;
and the reflecting prism is used for transmitting the detected and deflected light rays to be processed to the light beam coupling module.
Optionally, the light beam coupling module is further configured to perform beam expanding and collimating processing on the light to be processed after the light to be processed is reflected and depolarized, so as to increase a beam waist radius of the light to be processed and compress a divergence angle of the light to be processed.
Optionally, the beam coupling module includes: the polarization beam splitter comprises a polarization beam splitter prism, a depolarizer and a beam expanding and collimating unit; wherein the content of the first and second substances,
the polarization beam splitter prism comprises a polarization light incidence surface, a receiving light emergent surface and a transmitting and receiving shared surface; the polarized light incidence surface is used for receiving the light to be processed, and the optical axes of the receiving light emitting surface and the receiving and transmitting shared surface are superposed with the optical axis of the emitting light path;
the polarization beam splitter prism is used for reflecting the light to be processed and emitting the light to be processed from the receiving and transmitting shared surface to the depolarizer; and a light source for transmitting the received light, forming a polarized received light and emitting the polarized received light from the received light emitting surface;
the depolarizer is used for depolarizing the light to be processed to obtain emergent light in a non-polarized state; and the receiving and transmitting shared surface is used for transmitting the received light and transmitting the received light to the polarization splitting prism;
the beam expanding and collimating unit is used for emitting the emergent light rays through the emergent light path after beam expanding and collimating treatment is carried out on the emergent light rays; and the optical fiber is used for receiving the received light and transmitting the received light to the depolarizer.
Optionally, a distance between the polarization beam splitter prism and a beam waist of the signal emission optical system is equal to a distance between the polarization beam splitter prism and a focal point of the cassegrain telescope;
the signal transmitting optical system comprises a polarization beam splitter prism, a depolarizer and the beam expanding collimation unit.
Optionally, the beam expanding and collimating unit includes: a first positive meniscus lens and a second positive meniscus lens; wherein the content of the first and second substances,
the first positive meniscus lens is arranged on one side of the primary mirror, which is far away from the secondary mirror, and the second positive meniscus lens is arranged on one side of the secondary mirror, which faces the primary mirror;
the optical axes of the first positive meniscus lens and the second positive meniscus lens are overlapped, and the optical axes of the first positive meniscus lens and the second positive meniscus lens are overlapped.
Optionally, the polarization splitting prism includes: an optical film stack and two right angle prisms;
the inclined planes of the two right-angle prisms are oppositely arranged;
the optical film lamination is arranged on the working surfaces of the two right-angle prisms;
the optical film stack includes at least an antireflection film and a polarization splitting film.
Optionally, the light receiving module includes: the device comprises a neutral filter, a diaphragm, an optical fiber coupler, an optical fiber jumper, a first lens, a second lens, a narrow-band interference filter and a photoelectric converter; wherein the content of the first and second substances,
the neutral filter and the diaphragm are used for filtering stray light in the received light in the polarization state, adjusting the intensity of the received light, increasing the dynamic range of the received light detection and simultaneously improving the signal-to-noise ratio of the system;
the optical fiber coupler and the optical fiber jumper are used for transmitting the received light with the stray light filtered out to the first lens;
the first lens is used for converting the received light with the stray light filtered out into a parallel light signal;
the narrow-band interference filter is used for filtering interference signals of the parallel optical signals;
the second lens is used for focusing the parallel optical signals with the interference signals filtered out onto a detection surface of the photoelectric converter;
the photoelectric converter is used for performing photoelectric conversion on the parallel optical signals focused on the detection surface to obtain the detection signals.
According to the technical scheme, the embodiment of the application provides an optical transceiving system, the optical transceiving system comprises a Cassegrain telescope, a light beam coupling module, a light emitting module and a light receiving module, light to be processed emitted by the light emitting module is linearly polarized light, the purpose of coupling an emergent light path and a receiving light path is achieved by matching the light beam coupling module, and the purpose of integrating light receiving and light emitting based on the Cassegrain telescope with the optical axis is achieved. Simultaneously this card formula telescope's secondary mirror is including running through first through-hole wherein, the primary mirror is including running through the second through-hole wherein, the central line of first through-hole and second through-hole is the optical axis of card formula telescope, emergent light and receipt light all can be through first through-hole and second through-hole transmission, avoided secondary mirror and primary mirror to the sheltering from and absorbing of emergent light and receipt light, be favorable to improving the SNR of emergent light and receipt light, and because the existence of first through-hole in the secondary mirror, the sheltering from of secondary mirror center to receipt light has been avoided, non-blind area detection has been realized, the detection scope has been enlarged.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical transceiver system according to an embodiment of the present application;
FIG. 2 is a light trace diagram of a secondary mirror provided by an embodiment of the present application;
FIG. 3 is a schematic view of the focal relationship of a polarizing beam splitter prism, a signal emitting optical system, and a Cassegrain telescope provided by an embodiment of the present application;
fig. 4 is a flowchart illustrating an optical transceiving method according to an embodiment of the present application.
Detailed Description
As described in the background art, the optical transceiver system with an integrated structure in the prior art has the problems of low signal-to-noise ratio of the emergent light and the received light and large receiving dead zone.
The optical transceiving system of the Cassegrain telescope is a typical catadioptric receiving optical system, the inventor researches and discovers that when the Cassegrain telescope is used as a transmitting system, because the laser energy of an emergent beam is in Gaussian distribution, when the emergent beam is directly collimated and amplified by the Cassegrain telescope, the laser energy concentrated at the center can be blocked by a secondary mirror, the energy loss can be caused by the blocking to be at least about 50%, and the signal-to-noise ratio of the emitted light ray caused by the loss of energy density is relatively low; as a signal receiving optical system, the Cassegrain telescope has a small field angle and a blind area, and because of the existence of the secondary mirror, the near-field receiving light at the center of the optical axis is shielded and cannot be incident on the surface of the main reflecting mirror, the energy loss caused by the shielding can be caused, and the signal-to-noise ratio of the receiving light is greatly reduced. The current effective method for reducing the energy loss of the emitted light is to change the energy distribution of the light source by adding optical elements, but none of the methods can realize the integration of transceiving. As a receiving optical system, most methods directly use a Cassegrain telescope to focus and couple light rays into an optical fiber at present, but because the center of a secondary mirror is blocked, a blind area exists, the received light rays cannot completely enter a detection module through an optical receiving system, and the detection capability of a catadioptric laser radar is reduced.
In addition, in the aspect of integrating the optical transmitting and receiving systems of the catadioptric laser radar, the transmitting optical system is fixed at the position of the secondary mirror shielding of the receiving optical system to realize the transmitting and receiving integration, but the high-precision alignment of the optical axes of the transmitting and receiving optical systems is required, so that the catadioptric laser radar is not suitable for being applied to a long-distance measuring device.
In view of this, an embodiment of the present application provides an optical transceiver system, including: the device comprises a Cassegrain telescope, a light beam coupling module, a light emitting module and a light receiving module; wherein the content of the first and second substances,
the Cassegrain telescope comprises a primary mirror and a secondary mirror which are oppositely arranged, the secondary mirror comprises a first through hole penetrating through the secondary mirror, the primary mirror comprises a second through hole penetrating through the primary mirror, the central connecting line of the first through hole and the second through hole is the optical axis of the Cassegrain telescope, and the primary mirror and the secondary mirror form an emergent light path and a receiving light path of the Cassegrain telescope;
the light emitting module is used for emitting light to be processed, and the light to be processed is linearly polarized light;
the light beam coupling module is used for reflecting and depolarizing light to be processed to form unpolarized emergent light and emitting the emergent light through the emergent light path; and a light receiving line for transmitting the received light returned from the receiving optical path to the light receiving module;
the light receiving module is used for processing the received light to obtain a detection signal corresponding to the received light.
The optical transceiving system comprises a Cassegrain telescope, a light beam coupling module, a light emitting module and a light receiving module, light to be processed emitted by the light emitting module is linearly polarized light, and the purpose of coupling an emergent light path and a receiving light path is realized by matching with the light beam coupling module, namely the purpose of realizing integration of light receiving and light emitting based on the Cassegrain telescope with the same optical axis. Simultaneously this card formula telescope's secondary mirror is including running through first through-hole wherein, the primary mirror is including running through the second through-hole wherein, the central line of first through-hole and second through-hole is the optical axis of card formula telescope, emergent light and receipt light all can be through first through-hole and second through-hole transmission, avoided secondary mirror and primary mirror to the sheltering from and absorbing of emergent light and receipt light, be favorable to improving the SNR of emergent light and receipt light, and because the existence of first through-hole in the secondary mirror, the sheltering from of secondary mirror center to receipt light has been avoided, non-blind area detection has been realized, the detection scope has been enlarged.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
An embodiment of the present application provides an optical transceiver system, as shown in fig. 1, including: the cassegrain telescope 200, the beam coupling module 400, the light emitting module 100 and the light receiving module 300; wherein the content of the first and second substances,
the cassegrain telescope 200 comprises a primary mirror 5 and a secondary mirror 6 which are oppositely arranged, the secondary mirror 6 comprises a first through hole which penetrates through the secondary mirror 6, the primary mirror 5 comprises a second through hole which penetrates through the primary mirror 5, the central connecting line of the first through hole and the second through hole is the optical axis of the cassegrain telescope 200, and the primary mirror 5 and the secondary mirror 6 form the emergent light path and the receiving light path of the cassegrain telescope 200;
the light emitting module 100 is configured to emit light to be processed, where the light to be processed is linearly polarized light;
the light beam coupling module 400 is configured to reflect and depolarize light to be processed to form unpolarized outgoing light, and to emit the unpolarized outgoing light through the outgoing light path; and a transmission path for transmitting the reception light returned from the reception light path to the light reception module 300;
the light receiving module 300 is configured to process the received light to obtain a detection signal corresponding to the received light.
In the embodiment, the cassegrain telescope 200 comprises a secondary mirror 6 and a primary mirror 5, wherein the caliber of the primary mirror 5 can be 160nm, and the curvature radius of a reflecting aspheric surface is-742.86 mm; the aperture size of the first through hole formed in the center of the secondary mirror 6 is determined by the laser beam expansion multiple and the light trace pattern of the secondary mirror 6, the aperture of the secondary mirror 6 can be selected to be 52nm, the curvature radius of the reflecting spherical surface is-290.28 mm, and the light trace pattern of the secondary mirror 6 refers to fig. 2.
In an embodiment of the present application, the material of the primary mirror 5 and the secondary mirror 6 may be any one of fused quartz, microcrystalline glass, or silicon carbide, and the surface of the material is coated with a reflective film to improve light reflectivity.
In this embodiment, the light to be processed emitted from the light emitting module 100 is linearly polarized light, and the light beam coupling module 400 is used to couple an emitting light path and a receiving light path, that is, the cassegrain telescope 200 based on the same optical axis realizes the integration of light receiving and light emitting. Simultaneously secondary mirror 6 of cassegrain telescope 200 is including running through first through-hole wherein, cassegrain telescope 200's primary mirror 5 is including running through second through-hole wherein, the central line of first through-hole and second through-hole does cassegrain telescope 200's optical axis, emergent light all can pass through with receiving light first through-hole and second through-hole transmission have avoided secondary mirror 6 and primary mirror 5 to the sheltering from and absorbing of emergent light and received light, are favorable to improving the SNR of emergent light and received light, and because secondary mirror 6 is including running through secondary mirror 6's first through-hole has avoided secondary mirror 6 is to the sheltering from of received light has realized the non-blind area and has surveyed, has enlarged detection range.
A possible structure of each component of the optical transceiver system provided in the embodiments of the present application is illustrated below.
In one embodiment of the present application, still referring to fig. 1, the optical transmit module 100 includes: a polarization laser 1, a polarizing plate 2, and a reflection prism 3; wherein the content of the first and second substances,
the polarization laser 1 is used for emitting the light to be processed to the polaroid 2;
the polaroid 2 is used for analyzing and deflecting the light to be processed and transmitting the light to the reflecting prism 3;
the reflecting prism 3 is configured to transmit the analyzed light beam to be processed to the light beam coupling module 400.
The polarization laser 1 can adopt a 532nm Q-switched micro-pulse polarization laser 1, and the polarization laser 1 takes a 808nm semiconductor laser as a pumping source and is driven by Nd: YV04 (neodymium-doped yttrium vanadate crystal) crystal generates 1064nm laser, then obtains 532nm laser as the light output to be processed by PPLN (lithium niobate Poled) crystal frequency multiplication, adopts polarizing film 2 to carry out polarization analysis, finally outputs low-energy short pulse laser, and solves the safety problem for human eyes.
On the basis of the foregoing embodiment, in another embodiment of the present application, the light beam coupling module 400 is further configured to perform beam expanding and collimating processing on the light to be processed after performing reflection and depolarization processing on the light to be processed, so as to increase a beam waist radius of the light to be processed and compress a divergence angle of the light to be processed.
Accordingly, still referring to fig. 1, the beam coupling module 400 includes: the polarization beam splitter prism 9, the depolarizer 4 and the beam expanding and collimating unit 410; wherein the content of the first and second substances,
the polarization beam splitter prism 9 comprises a polarization light incidence surface, a receiving light emergent surface and a transmitting and receiving common surface; the polarized light incidence surface is used for receiving the light to be processed, and the optical axes of the receiving light emitting surface and the receiving and transmitting shared surface are superposed with the optical axis of the emitting light path;
the polarization beam splitter prism 9 is configured to perform reflection processing on the light to be processed, and emit the light from the receiving and transmitting common surface to the depolarizer 4; and a light source for transmitting the received light, forming a polarized received light and emitting the polarized received light from the received light emitting surface;
the depolarizer 4 is configured to depolarize the light to be processed to obtain unpolarized emergent light; and a transmitting and receiving common surface for transmitting the received light and transmitting the received light to the polarization beam splitter prism 9;
the beam expanding and collimating unit 410 is configured to perform beam expanding and collimating processing on the emergent light rays, and then emit the emergent light rays through the emergent light path; and is used for receiving the received light and transmitting the received light to the depolarizer 4.
Still referring to fig. 1, the expanded beam collimating unit 410 includes: a first positive meniscus lens 8 and a second positive meniscus lens 7; wherein the content of the first and second substances,
the first positive meniscus lens 8 is arranged on one side of the primary mirror 5, which is far away from the secondary mirror 6, and the second positive meniscus lens 7 is arranged on one side of the secondary mirror 6, which faces the primary mirror 5;
the optical axes of the first positive meniscus lens 8 and the second positive meniscus lens 7 coincide, and coincide with the optical axis of the outgoing light path.
In fig. 1, the polarized light incidence surface of the polarization splitting prism 9 is perpendicular to the incidence direction of the light to be processed, and the center line of the light receiving and emitting surface coincides with the center line of the transmitting and receiving common surface. The receiving and transmitting common surface is used as an exit surface of the light to be processed and an entrance surface of the received light, that is, the polarization splitting prism 9 is an important device for coupling the receiving and transmitting optical path and the receiving optical path, and is an important device for distinguishing the light to be processed transmitted to the depolarizer 4 from the received light transmitted through the depolarizer 4.
In fig. 1, the polarization splitting prism 9, the depolarizer 4, the first positive meniscus lens 8, and the second positive meniscus lens 7 constitute a signal emitting optical system and a signal receiving optical system at the same time.
Referring to fig. 3, the distance between the polarization splitting prism 9 and the beam waist of the signal transmission optical system is equal to the distance between the polarization splitting prism 9 and the focal point of the cassegrain telescope 200.
In the beam expanding and collimating unit 410, an aperture of the second positive meniscus lens 7 may be 22mm, a surface type is a spherical surface, an aperture of the first positive meniscus lens 8 may be 12.5mm, wherein a surface type of a left side surface (i.e., a surface facing the primary mirror 5) is an even aspheric surface, and specific optical parameters refer to table 1.
TABLE 1 optical Transmit-receive System parameter Table
Still referring to fig. 1, the polarization splitting prism 9 includes: an optical film stack and two right angle prisms;
the inclined planes of the two right-angle prisms are oppositely arranged;
the optical film lamination is arranged on the working surfaces of the two right-angle prisms;
the optical film stack includes at least an antireflection film and a polarization splitting film.
The right angle prism's material can adopt the calcium fluoride material, and cassegrain telescope 200 and collimation beam expanding unit are installed in the mirror holder in proper order, the material of mirror holder is low linear expansion coefficient materials such as aluminum alloy material, titanium alloy material, invar alloy material or carbon composite fiber, and the mirror holder material has lower expansion coefficient at-40 ℃ -50 ℃ for the expansion or the contraction coefficient between the connecting piece of primary mirror 5 and secondary mirror 6, cassegrain telescope 200 and beam expanding collimation unit 410 and between the lens of lens group is little, is favorable to optical transceiver system to obtain better image quality.
With respect to the light receiving module 300, still referring to fig. 1, the light receiving module 300 includes: a neutral filter 10, a diaphragm 11, a fiber coupler 12, a fiber jumper 13, a first lens 131, a second lens 132, a narrow-band interference filter 14, and a photoelectric converter 15; wherein the content of the first and second substances,
the neutral filter 10 and the diaphragm 11 are used for filtering stray light in the received light in the polarization state and adjusting the intensity of the received light, so that the dynamic range of the detection capability of the received light is increased, and the signal-to-noise ratio of the system is improved;
the optical fiber coupler 12 and the optical fiber jumper 13 are configured to transmit the received light, from which the stray light is filtered, to the first lens 131;
the first lens 131 is configured to convert the received light with the stray light filtered out into a parallel light signal;
the narrow-band interference filter 14 is configured to filter an interference signal of the parallel optical signal;
the second lens 132 is configured to focus the parallel optical signal with the interference signal filtered out onto the detection surface of the photoelectric converter 15;
the photoelectric converter 15 is configured to perform photoelectric conversion on the parallel optical signal focused on the detection surface to obtain the detection signal.
The first lens 131 and the second lens 132 constitute a lens group 130.
In the optical transceiver system shown in fig. 1, the operation process thereof substantially includes:
the polarization laser 1 emits light to be processed, and the light to be processed is analyzed and polarized by the polarizing film 2 and then reflected to the polarization beam splitter prism 9 by the reflecting prism 3;
after entering the polarization light incidence surface of the polarization beam splitter prism 9, the light to be processed is reflected to the depolarizer 4, and after being depolarized by the depolarizer 4, the light to be processed obtains the emergent light in the non-polarization state and is emergent, so that the signal emergent process is completed.
The received light after the emergent light is scattered by the target to be measured is recycled and enters the depolarizer 4 through the cassegrain telescope 200 and the beam expanding collimation unit 410, and the received light is unpolarized, so that the received light passing through the depolarizer 4 is unpolarized, and can smoothly penetrate through the polarization beam splitter prism 9 behind the depolarizer 4, thereby achieving the purpose of distinguishing the transmitted light from the received light.
The received signal after passing through the polarization beam splitter prism 9 is changed into polarized light, and stray light is filtered through a central filter and a diaphragm 11;
the received light passing through the diaphragm 11 enters the optical fiber jumper 13 through the light coupler;
the received light output by the optical fiber jumper 13 is transmitted to the first lens 131, and the first lens 131 converts the received light from which stray light has been filtered into parallel optical signals;
the parallel optical signal enters the second lens 132 after being subjected to the narrow-band interference filter 14;
the second lens 132 converges the parallel optical signal transmitted through the narrow-band interference filter 14 on the detection surface of the photoelectric converter 15, thereby integrating transmission and reception of the optical signal.
The following describes an optical transceiving method provided in an embodiment of the present application, and the optical transceiving method described below may be referred to in correspondence with the optical transceiving system described above.
Correspondingly, an embodiment of the present application further provides an optical transceiving method, as shown in fig. 4, which is applied to the optical transceiving system according to any of the above embodiments, where the optical transceiving system includes: the Cassegrain telescope comprises a Cassegrain telescope, a light beam coupling module, a light emitting module and a light receiving module, wherein the Cassegrain telescope comprises a primary mirror and a secondary mirror which are oppositely arranged, the secondary mirror comprises a first through hole penetrating through the secondary mirror, the primary mirror comprises a second through hole penetrating through the primary mirror, the central connecting line of the first through hole and the second through hole is the optical axis of the Cassegrain telescope, and the primary mirror and the secondary mirror form an emergent light path and a receiving light path of the Cassegrain telescope; the optical transceiving method comprises the following steps:
s101: emitting light to be processed to the light beam coupling module by using the light emitting module, wherein the light to be processed is linearly polarized light;
s102: reflecting and depolarizing the light to be processed by using the light beam coupling module to form emergent light in a non-polarized state, wherein the emergent light is emitted through the emergent light path;
s103: receiving returned receiving light rays by using the receiving light path, and transmitting the receiving light rays to the light receiving module by using the light beam coupling module;
s104: and processing the received light by using the light receiving module to obtain a detection signal corresponding to the received light.
Alternatively, when the light emitting module includes: polarized laser, polaroid and reflection prism, beam coupling module includes: polarization beam splitter prism, depolarizer and the collimation unit that expands beam, the light receiving module includes: the device comprises a neutral filter, a diaphragm, an optical fiber coupler, an optical fiber jumper, a first lens, a second lens, a narrow-band interference filter and a photoelectric converter;
still referring to fig. 4, the emitting the light to be processed to the beam coupling module by the light emitting module includes:
s1011: emitting the light to be processed by using a polarization laser, and transmitting the light to be processed to the reflecting prism after the light to be processed is analyzed and polarized by the polarizing film;
s1012: reflecting the light to be processed after polarization analysis to a polarized light incidence surface of the polarization beam splitter prism by using the reflecting prism;
the light beam coupling module is utilized to reflect and depolarize the light to be processed to form emergent light in a non-polarized state, and the emergent light is emitted through the emergent light path, wherein the emergent light path comprises:
s1021: reflecting the incident light to be processed to the depolarizer by using the polarization splitting prism, and depolarizing the light to be processed by the depolarizer to obtain emergent light in an unpolarized state;
s1022: after the beam expanding collimation unit is used for carrying out beam expanding collimation on the emergent light, the emergent light is emitted through the emergent light path;
the receiving the returned receiving light by using the receiving optical path and transmitting the receiving light to the light receiving module by using the beam coupling module includes:
s1031: receiving returned received light by using a receiving light path of the Cassegrain telescope, wherein the received light sequentially penetrates through the beam expanding collimation unit, the depolarizer and the polarization splitting prism to form a polarized received light which is transmitted to the neutral filter;
s1032: filtering stray light in the received light in the polarization state by using the neutral filter and the diaphragm, and adjusting the intensity of the received light;
s1033: transmitting the received light line with the stray light filtered out to the first lens by using the optical fiber coupler and the diaphragm;
s1034: converting the received light with the stray light filtered out into a parallel light signal by using the first lens;
s1035: filtering interference signals of the parallel optical signals by using the narrow-band interference filter;
s1036: focusing the parallel optical signals with the interference signals filtered out onto a detection surface of the photoelectric converter by using the second lens;
s1037: performing photoelectric conversion on the parallel optical signal focused on the detection surface by using the photoelectric converter to obtain the detection signal.
To sum up, this application embodiment provides an optics receiving and dispatching system, optics receiving and dispatching system includes cassegrain telescope, light beam coupling module, light emission module and light receiving module, and the pending light of light emission module outgoing is the linear polarization light, and the purpose of cooperation light beam coupling module realization outgoing light path and receiving light path coupling, the cassegrain telescope realization light reception and the light transmission integration purpose based on the same optical axis promptly. Simultaneously this card formula telescope's secondary mirror is including running through first through-hole wherein, the primary mirror is including running through the second through-hole wherein, the central line of first through-hole and second through-hole is the optical axis of card formula telescope, emergent light and receipt light all can be through first through-hole and second through-hole transmission, avoided secondary mirror and primary mirror to the sheltering from and absorbing of emergent light and receipt light, be favorable to improving the SNR of emergent light and receipt light, and because the existence of first through-hole in the secondary mirror, the sheltering from of secondary mirror center to receipt light has been avoided, non-blind area detection has been realized, the detection scope has been enlarged.
Features described in the embodiments in the present specification may be replaced with or combined with each other, each embodiment is described with a focus on differences from other embodiments, and the same and similar portions among the embodiments may be referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. An optical transceiver system, comprising: the device comprises a Cassegrain telescope, a light beam coupling module, a light emitting module and a light receiving module; wherein the content of the first and second substances,
the Cassegrain telescope comprises a primary mirror and a secondary mirror which are oppositely arranged, the secondary mirror comprises a first through hole penetrating through the secondary mirror, the primary mirror comprises a second through hole penetrating through the primary mirror, the central connecting line of the first through hole and the second through hole is the optical axis of the Cassegrain telescope, and the primary mirror and the secondary mirror form an emergent light path and a receiving light path of the Cassegrain telescope;
the light emitting module is used for emitting light to be processed, and the light to be processed is linearly polarized light;
the light beam coupling module is used for reflecting and depolarizing light to be processed to form unpolarized emergent light and emitting the emergent light through the emergent light path; and a light receiving line for transmitting the received light returned from the receiving optical path to the light receiving module;
the light receiving module is used for processing the received light to obtain a detection signal corresponding to the received light.
2. The optical transceiver system of claim 1, wherein the optical transmit module comprises: a polarizing laser, a polarizing plate and a reflecting prism; wherein the content of the first and second substances,
the polarized laser is used for emitting the light to be processed to the polaroid;
the polaroid is used for analyzing and deflecting the light to be processed and transmitting the light to the reflecting prism;
and the reflecting prism is used for transmitting the detected and deflected light rays to be processed to the light beam coupling module.
3. The optical transceiver system of claim 1, wherein the beam coupling module is further configured to perform beam expanding and collimating processing on the light to be processed after the light to be processed is reflected and depolarized, so as to increase a beam waist radius of the light to be processed and compress a divergence angle of the light to be processed.
4. The optical transceiver system of claim 3, wherein the beam coupling module comprises: the polarization beam splitter comprises a polarization beam splitter prism, a depolarizer and a beam expanding and collimating unit; wherein the content of the first and second substances,
the polarization beam splitter prism comprises a polarization light incidence surface, a receiving light emergent surface and a transmitting and receiving shared surface; the polarized light incidence surface is used for receiving the light to be processed, and the optical axes of the receiving light emitting surface and the receiving and transmitting shared surface are superposed with the optical axis of the emitting light path;
the polarization beam splitter prism is used for reflecting the light to be processed and emitting the light to be processed from the receiving and transmitting shared surface to the depolarizer; and a light source for transmitting the received light, forming a polarized received light and emitting the polarized received light from the received light emitting surface;
the depolarizer is used for depolarizing the light to be processed to obtain emergent light in a non-polarized state; and the receiving and transmitting shared surface is used for transmitting the received light and transmitting the received light to the polarization splitting prism;
the beam expanding and collimating unit is used for emitting the emergent light rays through the emergent light path after beam expanding and collimating treatment is carried out on the emergent light rays; and the optical fiber is used for receiving the received light and transmitting the received light to the depolarizer.
5. The optical transceiver system of claim 4, wherein the distance between the polarization splitting prism and the beam waist of the signal transmission optical system is equal to the distance between the polarization splitting prism and the focal point of the Cassegrain telescope;
the signal transmitting optical system comprises a polarization beam splitter prism, a depolarizer and the beam expanding collimation unit.
6. The optical transceiver system of claim 4, wherein the beam expanding and collimating unit comprises: a first positive meniscus lens and a second positive meniscus lens; wherein the content of the first and second substances,
the first positive meniscus lens is arranged on one side of the primary mirror, which is far away from the secondary mirror, and the second positive meniscus lens is arranged on one side of the secondary mirror, which faces the primary mirror;
the optical axes of the first positive meniscus lens and the second positive meniscus lens are overlapped, and the optical axes of the first positive meniscus lens and the second positive meniscus lens are overlapped.
7. The optical transceiver system of claim 4, wherein the polarization splitting prism comprises: an optical film stack and two right angle prisms;
the inclined planes of the two right-angle prisms are oppositely arranged;
the optical film lamination is arranged on the working surfaces of the two right-angle prisms;
the optical film stack includes at least an antireflection film and a polarization splitting film.
8. The optical transceiver system of claim 1, wherein the light receiving module comprises: the device comprises a neutral filter, a diaphragm, an optical fiber coupler, an optical fiber jumper, a first lens, a second lens, a narrow-band interference filter and a photoelectric converter; wherein the content of the first and second substances,
the neutral filter and the diaphragm are used for filtering stray light in the received light in the polarization state, adjusting the intensity of the received light, increasing the dynamic range of the received light detection and simultaneously improving the signal-to-noise ratio of the system;
the optical fiber coupler and the optical fiber jumper are used for transmitting the received light with the stray light filtered out to the first lens;
the first lens is used for converting the received light with the stray light filtered out into a parallel light signal;
the narrow-band interference filter is used for filtering interference signals of the parallel optical signals;
the second lens is used for focusing the parallel optical signals with the interference signals filtered out onto a detection surface of the photoelectric converter;
the photoelectric converter is used for performing photoelectric conversion on the parallel optical signals focused on the detection surface to obtain the detection signals.
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| CN202021356041.1U CN212321833U (en) | 2020-07-10 | 2020-07-10 | Optical transceiver system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295626A (en) * | 2021-05-19 | 2021-08-24 | 中国科学院合肥物质科学研究院 | Aerosol extinction spectrum measurement method and device based on array type micro-pulse laser radar |
| CN113485023A (en) * | 2021-07-06 | 2021-10-08 | 上海国科航星量子科技有限公司 | Polarization maintaining optical path system based on directional mirror |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113295626A (en) * | 2021-05-19 | 2021-08-24 | 中国科学院合肥物质科学研究院 | Aerosol extinction spectrum measurement method and device based on array type micro-pulse laser radar |
| CN113485023A (en) * | 2021-07-06 | 2021-10-08 | 上海国科航星量子科技有限公司 | Polarization maintaining optical path system based on directional mirror |
| CN113485023B (en) * | 2021-07-06 | 2022-08-26 | 上海国科航星量子科技有限公司 | Polarization maintaining optical path system based on directional mirror |
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