CN115268066B - Wavelength selective switch with channel detection and automatic calibration functions - Google Patents
Wavelength selective switch with channel detection and automatic calibration functions Download PDFInfo
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- CN115268066B CN115268066B CN202210809458.6A CN202210809458A CN115268066B CN 115268066 B CN115268066 B CN 115268066B CN 202210809458 A CN202210809458 A CN 202210809458A CN 115268066 B CN115268066 B CN 115268066B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/10—Beam splitting or combining systems
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29301—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means based on a phased array of light guides
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29304—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by diffraction, e.g. grating
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
- G02B6/29382—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM including at least adding or dropping a signal, i.e. passing the majority of signals
- G02B6/29385—Channel monitoring, e.g. by tapping
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a wavelength selective switch with channel detection and automatic calibration functions, which integrates an optical fiber communication channel optical signal detection OCM module, and corrects the drift amount of wavelength selective switch parameters along with the working temperature according to the measurement data of the OCM module, thereby improving the module integration level and the working stability of the wavelength selective switch; the invention adopts a beam-splitting mode in the wavelength selective switch, utilizes the photoelectric sensor array to measure the power, bandwidth and wavelength of the whole communication wave band in real time, and is used as the reference for correcting the center frequency of the wavelength selective switch to correct the center frequency drift.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a wavelength selective switch with channel detection and automatic calibration functions.
Background
The application and development of the wavelength division multiplexing technology can transmit more different wavelengths in the same optical fiber, so that the communication capacity of the optical communication system is greatly promoted.
The optical communication network is realized by adopting a ring structure and a topological structure, and the ROADM can realize multiplexing and demultiplexing of optical signals at different nodes of the optical communication network, namely, flexible configuration and scheduling are carried out on any wavelength of any port, so that the scheduling flexibility of the optical network is improved.
The WSS is a core module in the ROADM system, and can realize optical signal switching, attenuation or blocking of any wavelength or wavelength combination at any communication port on the basis of optical signal detection by the OCM in the RODAM system. The WSS technology principle is that the spatial expansion of communication wavelength is carried out based on a fixed period diffraction grating and a spatial optical system, and the deflection of light beams with different wavelengths is realized by utilizing a micro-mechanical structure MEMS or LCoS technology, so that the function of the WSS is realized.
The WSS based on the LCoS technology has a variable bandwidth modulation function, so that the WSS is more flexible to apply in optical communication and becomes the main stream of the market, and the principle is that different patterns of LCoS are displayed as different diffraction grating structures, so that the directional deflection of light beams can be realized, and meanwhile, the LCoS consists of a plurality of tiny pixels, so that the patterns can be freely edited, and the dynamic grid adjustment is realized.
The application environment of the optical communication equipment is harsh, stable operation is required in a larger temperature range (usually-5-70 ℃), the WSS is usually realized by adopting a space optical structure, the optical path is longer, the structure is complex, and the grating and the LCoS are sensitive to temperature, so the WSS generally has a temperature control function and is matched with a correction algorithm, and the stable operation is realized by measuring the performances of the WSS at different temperatures, forming a fixed relation and correcting wavelength drift corresponding to different temperatures.
In the prior patent (CN 112596167A), when the repeatability of data between the measured LCoS pixel position and wavelength along with the temperature change is poor, the accuracy of WSS wavelength drift correction is affected; in addition, a light source and an optical fiber are added, and a part of area is reserved on the LCoS surface independently, so that the effective working area of the LCoS is occupied, and the utilization rate of the LCoS is reduced; a third disadvantage is that only a single wavelength is monitored, the drift of the single wavelength is used to represent the entire communication band, and the nonlinear relationship between them reduces the accuracy of correction of the temperature drift; a fourth disadvantage is that the power and wavelength stability of the individual light sources can affect the accuracy of the wavelength drift correction.
In the prior patent (CN 102879864), the calibration of the parameters is usually carried out once when the product leaves the factory, and the correction of the wavelength is carried out according to the calibration curve, if the test curve has good repeatability, the accuracy of the wavelength correction is affected under the condition of poor repeatability; because the temperature sensor is usually placed close to the grating, the repeatability of the curve can be affected by the difference of the temperature uniformity and consistency of the optical system, and high requirements are put on the consistency of the product and the temperature control; if the product finds obvious wavelength deviation in the use process, the product needs to be removed from the optical network for recalibration, and the continuity of optical communication is affected.
Disclosure of Invention
The present invention is directed to a wavelength selective switch with channel detection and automatic calibration functions, so as to solve the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a wavelength selective switch with channel detection and auto-calibration functions, the wavelength selective switch comprising an optical fiber array, a polarization processing device, a collimating lens, an imaging device, a switching lens, an aberration compensator, a dispersive grating, and an LCoS assembly;
the LCoS component is positioned at a focus in the dispersion direction of the optical system and horizontally fixed on the optical bottom plate, and comprises a light splitting component, an LCoS and a photoelectric detector array, wherein the photoelectric detector array and the LCoS are not vertically arranged.
Preferably, in the wavelength selective switch, the wavelength switching process is as follows:
the optical fiber array 101 is an optical input/output port;
the outgoing optical fiber beam is transmitted to a polarization processing device 102 by an optical fiber array 101;
the polarization processing device 102 converts the free polarization state of the light beam to the same polarization state;
then enters a collimating lens 103 so as to primarily collimate the emergent light beam of the optical fiber;
then enters the imaging device 104 and the switching lens 105 in turn, and as the imaging device 104 and the switching lens 105 respectively disperse and switch in directions, 1:1 and 2F optical systems, completing the optical coupling effect of the light beams;
then enters an aberration compensation device, so that the coupling efficiency of the optical system is further improved;
then enters a dispersion grating, and the dispersion grating spreads the spectrum of the input optical system to the LCoS component 108 according to the wavelength;
the LCoS module 108 forms a grating in the switching direction at this time, and then the beam splitting module splits the beam;
the light energy with the proportion of 95% is incident to the LCoS, and the proportion of light is used for wavelength switching of the wavelength selective switch, so that the wavelength selective function is realized;
the light energy with the proportion of 5% is incident to the photoelectric detector array, the proportion of light is used for measuring the light power and the wavelength in real time, the light power and the wavelength drift of the wavelength selective switch are monitored, and the light energy is fed back to the wavelength selective switch for correction.
Preferably, the beam splitting ratio of the beam splitting assembly may be other values.
Preferably, the photodetector array may be one set, two sets, or another number, one set of which is placed on the wavelength selective switch dispersive focal plane.
Preferably, the light-splitting component may be polarized light-splitting or unpolarized light-splitting.
Preferably, the photodetector array may be one or more rows of detection cells. Preferably, the wavelength selective switch is modified as follows:
firstly, calibrating a product before leaving the factory, controlling the working temperature of a wavelength selection switch to enable the wavelength selection switch to work in a stable state, then setting a specific LCoS pattern, respectively selecting two ends and the middle of a communication wave band, and utilizing a broad spectrum light source covering the communication wave band to carry out spectrum scanning of the wavelength selection switch and a photoelectric detector array to obtain a corresponding relation curve between the wavelength selection switch and the photoelectric detector array, and storing the corresponding relation curve as a reference parameter;
in the working state of the wavelength selective switch, the spectrum curve of the photoelectric detector array is input into wavelength, power and bandwidth information of the wavelength selective switch after calculation, the obtained information is used for replacing the function of an optical fiber signal detection module OCM, LCoS graphic configuration is carried out in combination with the requirement of optical network cross on the configuration of the wavelength selective switch, and the wavelength switching function is realized;
meanwhile, the spectrum center wavelength information obtained by the photoelectric detector array is compared with the internal storage (before leaving the factory) information, so that the wavelength information offset input to the wavelength selection switch is obtained;
and finally, converting the offset into the position offset of the LCoS graph, and correcting the wavelength. Compared with the prior art, the invention has the beneficial effects that:
the wavelength selective switch integrates the optical fiber communication channel optical signal detection OCM module, and corrects the drift amount of the wavelength selective switch parameter along with the working temperature according to the measurement data of the OCM module, so that the module integration level and the working stability of the wavelength selective switch are improved;
the invention adopts a beam-splitting mode in the wavelength selective switch, and utilizes the photoelectric sensor array to measure the power, bandwidth and wavelength of the whole communication wave band in real time, and the power, bandwidth and wavelength are used as the reference for correcting the center frequency of the wavelength selective switch to correct the center frequency drift;
the invention adopts a light splitting mode, utilizes the photoelectric sensor array to measure the power, bandwidth and wavelength of the whole communication wave band in real time, and has two benefits as the reference of wavelength correction: integrating an OCM function, integrating the OCM into a wavelength selective switch, improving the integration level and reducing the cost;
secondly, spectral characteristics of the whole communication wave band are measured in real time, translation of the LCoS surface graph and wavelength correction are carried out according to measured data, and compared with the first comparison patent, the method has the advantages that an independent light source is not required to be added, an independent LCoS area is reserved, the utilization rate of LCoS is improved, indirect errors caused by power measurement are reduced, and the accuracy of wavelength correction is improved.
The invention has the advantages that the requirements on the precision and consistency of the temperature of the wavelength selective switch can be reduced, and the wavelength drift of the whole optical module is monitored instead of the grating, so that the optical-mechanical design and the process difficulty of the wavelength selective switch are reduced, and the wavelength correction precision is improved.
Drawings
FIG. 1 is a schematic diagram of a flow structure of the present invention;
FIG. 2 is a schematic diagram of a ROADM system of the present invention;
FIG. 3 is a schematic diagram of a wavelength selective switch according to the present invention;
fig. 4 is a schematic structural diagram of an LCoS module according to the present invention.
FIG. 5 is a schematic diagram of a spectrum of a test in the first embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a technical scheme that: in the wavelength selective switch with the channel detection and automatic calibration functions, in combination with fig. 1, a beam input to the wavelength selective switch is subjected to beam splitting treatment, 95% of light energy is used for the conventional function of the wavelength selective switch, 5% of light energy is input to a photodetector array for realizing an OCM function, and wavelength drift correction of the wavelength selective switch is performed according to measurement data.
In this embodiment, in conjunction with fig. 2, the wavelength selective switch may be applied to a ROADM system to perform optical cross processing, and the specific processing manner is as follows:
the optical signal in the optical fiber enters the optical switch Switches through the signal transmitting module Tx, then passes through the optical splitting module Spilters and the optical power amplifying module EDFA, then enters the wavelength selective switch, before entering, a part of the optical signal is divided into the optical fiber signal detecting module OCM, the optical fiber signal detecting module OCM scans the optical fiber to confirm the wavelength and the power information of the optical signal in the optical fiber, then the wavelength selective switch Switches the wavelength according to the spectral information and the scheduling configuration requirement, then passes through the optical power amplifying module EDFA and the optical splitting module Spilters, and then enters the signal receiving module Rx through the optical switch Switches.
Wherein the wavelength selective switch comprises an optical fiber array 101, a polarization processing device 102, a collimating lens 103, an imaging device 104, a switching lens 105, an aberration compensator 106, a dispersion grating 107 and an LCoS assembly 108;
with reference to fig. 3 and 4, the LCoS module 108 is located at the focal point of the optical system in the dispersion direction, because the spot diameter is smaller, typically 10-30um, in the dispersion direction, to facilitate smaller bandwidth channel switching,
the LCoS module 108 includes a beam splitting module 301, an LCoS302, and a photodetector array 303, in order to make the optical structure of the wavelength selective switch compact and improve stability, in general, the LCoS302 is horizontally fixed on an optical base plate, and a light beam is deflected and incident on the LCoS by using a reflector, because the photodetector array 303 is also placed on a dispersive focal point of the wavelength selective switch optical system, the unit size and the unit number of the photodetector array correspond to the LCoS in the direction of spectrum expansion, so as to perform parameter matching with the LCoS, and improve the monitoring effect, and in order to reduce the influence of the photodetector array on the wavelength selective switch signal, the photodetector array 303 is not placed vertically to the LCoS302, so as to avoid the reflected light on the surface of the photodetector array from entering the port of the wavelength selective switch;
in the above-described wavelength selective switch, the wavelength switching process is as follows:
the optical fiber array 101 is an optical input/output port;
the outgoing optical fiber beam is transmitted to a polarization processing device 102 by an optical fiber array 101;
the polarization processing device 102 converts the free polarization state of the light beam to the same polarization state;
then enters a collimating lens 103 so as to primarily collimate the emergent light beam of the optical fiber;
then enters the imaging device 104 and the switching lens 105 in turn, and as the imaging device 104 and the switching lens 105 respectively disperse and switch in directions, 1:1 and 2F optical systems, completing the optical coupling effect of the light beams;
then enters an aberration compensation device, so that the coupling efficiency of the optical system is further improved;
then enters a dispersion grating, and the dispersion grating spreads the spectrum of the input optical system to the LCoS component 108 according to the wavelength;
the LCoS module 108 forms a grating in the switching direction at this time, and then the beam splitting module splits the beam;
the light energy with the proportion of 95% is incident to the LCoS, and the proportion of light is used for wavelength switching of the wavelength selective switch, so that the wavelength selective function is realized;
the light energy with the proportion of 5% is incident to the photoelectric detector array, the proportion of light is used for measuring the light power and the wavelength in real time, the light power and the wavelength drift of the wavelength selective switch are monitored, and the light energy is fed back to the wavelength selective switch for correction.
The above-mentioned correction processing method of the wavelength selective switch is as follows:
the method comprises the steps of calibrating a product before leaving the factory, firstly controlling the working temperature of a wavelength selective switch to enable the wavelength selective switch to work in a stable state, then setting specific LCoS patterns, such as three patterns corresponding to 50GHz bandwidth, which are respectively positioned at two ends and in the middle of a communication band, and finally utilizing a broad spectrum light source covering the communication band to carry out spectrum scanning of the wavelength selective switch and a photoelectric detector array to obtain a corresponding relation curve between the wavelength selective switch and the photoelectric detector array, and storing the corresponding relation curve as a reference parameter; in the working state of the wavelength selective switch, the spectrum curve of the photoelectric detector array is calculated, the wavelength, power and bandwidth information input to the wavelength selective switch are calculated, the obtained information is used for replacing an OCM function, LCoS pattern configuration is carried out by combining the requirements of optical network cross on the configuration of the wavelength selective switch, the wavelength switching function is realized, meanwhile, the spectrum center wavelength information obtained by the photoelectric detector array is compared with internal storage (before leaving a factory) information, the wavelength information offset input to the wavelength selective switch is obtained, and the offset is converted into the position offset of the LCoS pattern, so that the wavelength is corrected.
In this embodiment, taking two wavelength signals input into the wavelength selective switch as an example, the test spectrum graph 5 is combined to describe in detail:
firstly, the peak frequency of the input wavelength, namely the center frequency, bandwidth, optical energy and the like of the signal can be obtained through fitting processing calculation of the test spectral line, the data can replace an OCM function, the tested data is fed back to the LCoS, and the pattern setting of the LCoS is carried out according to the configuration requirements of the wavelength selection switch wavelength and the switching port, so that the wavelength selection switch function is completed.
Meanwhile, the tested spectrum information is compared with the initial configuration information of the wavelength selective switch, wavelength drift data can be obtained, and the shift data is utilized to translate the LCoS graph, so that the function of correcting wavelength drift is achieved.
Because the photodetector array 303 is also placed on the optical focal point in the spectral dispersion direction of the wavelength selective switch, and is the same as the optical parameter received by the LCoS, measurement and contrast correction of wavelength information can be directly performed, and correction is not required to be indirectly performed through measuring temperature information, so that the accuracy of wavelength drift correction is improved, and meanwhile, the influence of the stability of the temperature measurement and the optical system on the accuracy of wavelength drift correction is reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A wavelength selective switch with channel detection and auto-calibration features: the wavelength selective switch comprises an optical fiber array (101), a polarization processing device (102), a collimating lens (103), an imaging device (104), an aperture Guan Toujing (105), an aberration compensator (106), a dispersion grating (107) and an LCoS assembly (108);
the LCoS assembly (108) comprises a light splitting assembly (301), an LCoS (302) and a photodetector array (303), wherein the photodetector array (303) is not placed perpendicular to the LCoS (302);
the wavelength switching process of the wavelength selective switch is as follows:
the optical fiber array (101) is an optical input/output port;
the optical fiber emergent beam is transmitted to a polarization processing device (102) by an optical fiber array (101);
a polarization processing device (102) converts the free polarization state of the light beam into the same polarization state;
then enters a collimating lens (103) so as to primarily collimate the emergent light beam of the optical fiber; then sequentially enters the imaging device (104) and the switch Guan Toujing (105), and the imaging device (104) and the switch Guan Toujing (105) respectively form 1:1 and 2F optical systems, completing the optical coupling effect of the light beams;
then enters an aberration compensator to further improve the coupling efficiency of the optical system;
then enters a dispersion grating, and the LCoS component (108) is positioned at the focus in the dispersion direction of the optical system and horizontally fixed on the optical bottom plate, so that the dispersion grating spreads the spectrum input into the optical system to the LCoS component (108) according to the wavelength;
the beam splitting component of the LCoS component (108) splits the light beam at the moment;
the light energy with the proportion of 95% is incident to the LCoS, and the proportion of light is used for wavelength switching of the wavelength selective switch, so that the wavelength selective function is realized;
the light energy with the proportion of 5% is incident to the photoelectric detector array, the proportion of light is used for measuring the light power and the wavelength in real time, the light power and the wavelength drift amount are monitored, and the light power and the wavelength drift amount are fed back to the wavelength selective switch for correction.
2. A wavelength selective switch with channel detection and auto-calibration according to claim 1, characterized in that: the photoelectric detector arrays are one group and are placed on the chromatic dispersion focal plane of the wavelength selective switch, or the photoelectric detector arrays are two groups, wherein one group is placed on the chromatic dispersion focal plane of the wavelength selective switch.
3. A wavelength selective switch with channel detection and auto-calibration according to claim 1, characterized in that: the light splitting component is unpolarized light splitting.
4. A wavelength selective switch with channel detection and auto-calibration according to claim 1, characterized in that: the photodetector array is one or more rows of detection units.
5. A wavelength selective switch with channel detection and auto-calibration according to claim 1, characterized in that: the wavelength selective switch is modified as follows:
firstly, the calibration is carried out before the product leaves the factory, and the working temperature of the wavelength selective switch is controlled,
the wavelength selective switch works in a stable state, then a specific LCoS graph is set, the two ends and the middle of a communication wave band are respectively selected, the spectrum scanning of the wavelength selective switch and the photoelectric detector array is carried out by using a broad spectrum light source covering the communication wave band, a corresponding relation curve between the wavelength selective switch and the photoelectric detector array is obtained, and the corresponding relation curve is used as a reference parameter for storage;
in the working state of the wavelength selective switch, the spectrum curve of the photoelectric detector array,
the calculated wavelength, power and bandwidth information are input into a wavelength selective switch, the obtained information is used for replacing the function of an optical fiber signal detection module OCM, LCoS graphic configuration is carried out by combining the requirements of optical network cross on the configuration of the wavelength selective switch, and the wavelength switching function is realized;
meanwhile, the spectrum center wavelength information obtained by the photoelectric detector array is compared with the internal storage information before delivery, so that the wavelength information offset input to the wavelength selection switch is obtained;
and finally, converting the offset into the position offset of the LCoS graph, and correcting the wavelength.
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| JP5200229B2 (en) * | 2010-01-27 | 2013-06-05 | 独立行政法人産業技術総合研究所 | Wavelength domain optical switch |
| CN102590953B (en) * | 2011-09-13 | 2015-02-11 | 博创科技股份有限公司 | Wavelength-selective optical switch |
| AU2013292569B2 (en) * | 2012-07-19 | 2016-12-22 | Finisar Corporation | Polarization diverse wavelength selective switch |
| CN102879864B (en) * | 2012-11-01 | 2014-04-16 | 武汉邮电科学研究院 | Wavelength shift detection and calibration method for LCOS (Liquid Crystal On Silicon) wavelength selection switch |
| WO2015134393A1 (en) * | 2014-03-04 | 2015-09-11 | Finisar Corporation | A calibration system for a wavelength selective switch |
| US11454813B2 (en) * | 2019-11-07 | 2022-09-27 | GM Global Technology Operations LLC | Holographic display systems with polarization correction and distortion reduction providing enhanced image quality |
| CN114731208A (en) * | 2019-12-31 | 2022-07-08 | 华为技术有限公司 | Wavelength selective switch |
| CN113156585A (en) * | 2020-01-23 | 2021-07-23 | 华为技术有限公司 | Wavelength selective switch WSS |
| CN113497665A (en) * | 2020-03-20 | 2021-10-12 | 华为技术有限公司 | Optical switch and optical performance detection method based on optical switch |
| CN114614937A (en) * | 2020-12-08 | 2022-06-10 | 华为技术有限公司 | Wavelength selection switch, optical performance monitoring system and optical performance monitoring method |
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