CN101110761B - Optical packet switching system with polarized and mixed mark of wavelength - Google Patents
Optical packet switching system with polarized and mixed mark of wavelength Download PDFInfo
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Abstract
The present invention relates to an optical packet switching system for wavelength polarization mixed marking. which carries an optical routing with an optical packet header, and marks the routing information with the wavelength and the polarization state. Under the unified control of an edge node optical label controlling module, a wavelength label generates module and outputs optical pulses with different wavelengths, a polarization label generates module and controls the polarization state of the optical pulses, and the optical packet header and the optical packet carrying the wavelength and polarization information are transmitted to a core node after the wavelength division multiplexing. The core node separates the optical packet header and the optical packet, and inputs the optical pulses with different wavelengths of the optical packet header to a wavelength label detection module. The carried polarization information is detected by a polarization label detection module, and the polarization state is identified by the polarization label detection module, to get the routing information. The core node controls the switching matrix and operates the optical packet switching according to the obtained routing information. The present invention solves the problem brought about by a multi-wavelength that the information carrying amount of the packet header is limited because the number of usable wavelengths is limited in the same channel, and the problem that the directions of the polarization axle are not in accordance is solved.
Description
Technical field
The present invention relates to a kind of optical packet switching system, relate in particular to a kind of optical packet switching system based on optical wavelength and polarization state mixed mark, solve the problems such as light letter head formation, routing iinformation carrying and exchange message processing of light grouping, belonged to the optical communication technique field.
Background technology
In the light switching technology that has conducted a research, difference by exchanged form, usually the light switching technology is divided into 3 classes, optical link exchange OCS (Optical Circuit Switching), light grouping (bag) exchange OPS (OpticalPacket Switching) and between the light burst-switched OBS between the two (Optical Burst Switching).Early the light switch mode of research is the optical link exchange, and basic switching building is called out, and the bandwidth of whole call is retained in the two process.Its major defect is must at first set up the wavelength routing channel before data transmit, and channel wavelength to be occupied always, finishes just being released until call.In the light burst-switched (OBS), signal is divided into the control grouping that comprises routing iinformation and the packet of bearer service.Packet is directly being transmitted in the transparent transmission channel end to end without opto-electronic conversion by the router electron process in the control information of control grouping.The communication bandwidth of OBS only needs unidirectional reservation, and the exchange granularity is better than the optical link exchange, but control information needs the outer channel resource of occupying volume.That even more ideal is optical packet switching technique (OPS), OPS is divided into optical information on the light letter head of fixing light load and carrying routing iinformation, constituting the light grouping with set form transmits, it is that a kind of nothing connects (Connectionless) transmission means from route (Self-routing), information needn't be waited for direct transmission before sending, and stores forwarding (S﹠amp at the Optical Switch Node place; F), at destination node each packet sequencing is recovered original data stream.This technology attempts directly to realize the packet switching of small grain size on photosphere, have few expense, high bandwidth availability ratio, transmit advantages such as information format is transparent.
Development along with multi protocol label exchange MPLS (Multi-Protocol Label Switching) technology, people introduce OPS with the thought of label switched, light grouping (Optical Packet) is divided into light letter head (Optical Header) and the fixing light bag (Optical Payload) of time span that carries routing iinformation, light is grouped in identification and the route querying that the OPS switching node is finished light letter head (mark), and light letter head after the renewal (exchange) and light bag (load) form new light grouping continuing to enter next stage optical-fiber network and transmit.The signal of this mode is finished identification and is handled in electric territory, load is transparent transmission in the overall optical network.The article of report optical mark switching technique research is also very many now, and its achievement in research causes extensive concern.It should be noted that a kind of method of light packet switching of multi-wavelength light mark mode.People such as Shilin Xiao are at " IEEE Photonics Technology Letters " (Institute of Electrical and Electric Engineers photon technology wall bulletin) 2003,15 (4): " Realization ofMulti-wavelength Label Optical Packet Switching " (realization of multi-wavelength mark light packet switching) delivered on the 605-607 proposed a kind of with in the specific implementation method of OPS technology of wavelength mark, and realized a simple signal switching system.
In this system, light letter head is made up of some light pulses with different wave length, and the various combination of these light pulses has been represented different routing iinformations.The wavelength of light pulse and the carrier wave of light bag belong to same wavelength channel in this light letter head, not the outer wavelength resource of occupying volume.At the switching node place, realize the light wave Route Selection by judgement to light pulse different wave length combination in the light letter head.Since constitute the mark wavelength of the light pulse of light letter head can only be in the communication channel passband value, and the light pulse of different wave length will take certain bandwidth, too much wavelength mark can cause each other string around, this has just limited and can cause light letter portable amount of information limited in order to the number of the pulse of mark.
Light also has a characteristic except amplitude, phase place, frequency be exactly polarization.Polarised light can be divided into elliptically polarized light and linearly polarized light.If in communication process, only there is the vibration of a certain definite direction in light, this light is called linearly polarized light.Elliptically polarized light can be decomposed into the mutually perpendicular linearly polarized light of any both direction, is exactly circularly polarized light when these two component amplitudes equate.According to the polarisation of light characteristic, a kind of digital transmission technology that is called polarisation shift keying (POLSK) has been proposed in recent years, it is by adjusting the polarization state that the external polarization controller produces two quadratures, difference representative data " 1 " and " 0 ", by two linear orthogonal polarization states of modulated transmission signal, carry out message transmission.Sergio Benedetto is at " IEEE TRANSACTIONS ONCOMMUNICATIONS " VOL.40, NO.4, polarization state offset keying (Polarization Shift Keying, PolSK) principle of technology have been set forth on " the Theory of PolarizationShift Keying Modulation " that delivers on the APRIL1992.The polarisation shift key control technology has and is subjected to the light source phase noise to influence very little, as effectively to suppress the nonlinear effect in Optical Fiber Transmission process characteristics, but this technology is because the influence of optical fiber polarisation attitude chromatic dispersion, polarization information can change in optical fiber middle and long distance transmission rear polarizer direction, and its receiver (Stokes receiver) structure more complicated, need the receiver module polarization axle consistent with the sending module polarization axis direction, the realization difficulty is big, has limited the application of this modulation system in high speed data transfer to a certain extent.
Summary of the invention
The objective of the invention is at the deficiencies in the prior art, propose a kind of optical packet switching system of polarized and mixed mark of wavelength, improve a light letter portable amount of information, thereby promote the performance of overall optical tag switching network.
Be to realize this purpose, the present invention is with a light letter head carrying routing iinformation, with wavelength and the polarization state parameter that serves as a mark jointly.Under the unification of signal control module is controlled in signal exchange fringe node, the light pulse of the different wave length of wavelength mark generation module output is carried out the polarization mark at polarization mark generation module and is loaded, the light letter head and the light bag process of carrying wavelength and polarization information regularly and behind the wavelength division multiplexing send to core node, wavelength marker detection module is separated the light pulse of the different wave length of bright dipping letter head, detects the routing iinformation that it carries through polarization mark detection module again.The signal key control unit carries out the light packet switch by the routing iinformation control optical switch switching matrix that obtains.
The solution of the present invention specifically describes as follows:
System comprises signal exchange fringe node and signal exchcange core node.Its annexation is: the computer user's terminal that is used to demonstrate connects signal exchange fringe node by cable, signal exchange fringe node links to each other with signal exchcange core node by optical fiber, between signal exchcange core node and the signal exchcange core node through optical fiber interconnections.
Signal exchange fringe node main functional modules comprises: electronics input and output ply-yarn drill, the packing of light bag unpack processor, signal control module, wavelength mark generation module, polarization mark generation module and wavelength division multiplexer.Electronics input and output ply-yarn drill is connected with user terminal, the output of electronics input and output ply-yarn drill connects light bag packing unpack processor and signal control module respectively, the output of electronics input and output ply-yarn drill connects the signal control module, the unpack control signal output of processor and light bag of light bag packing exported and is connected signal control module and wavelength division multiplexer respectively, the output of signal control module is connected with wavelength mark generation module and polarization mark generation module respectively, the output of wavelength mark generation module is connected with polarization mark generation module, the output of polarization mark generation module is connected to wavelength division multiplexer, and the output of wavelength division multiplexer is connected to signal exchcange core node.
The main functional modules of signal exchcange core node comprises: wavelength mark detection module, the polarization mark detection module, signal key control unit, optical switch switching matrix, signal generation module and the output wave division multiplexer that are made of several single channel light polarization detecting units; Wavelength mark detection module links to each other with the output of signal fringe node, wavelength mark detection module separates light letter head with the light bag, the output of light letter head is connected to polarization mark detection module, the output of light bag is connected to the optical switch switching matrix, polarization mark detection module is connected with the signal key control unit, the route control output of signal key control unit is connected to the optical switch switching matrix, the output that the signal of signal key control unit control simultaneously generation module produces next Lu Guangxin head, the light bag of optical switch switching matrix output and be connected to the output wave division multiplexer by first new of the light letter of signal generation module.
Adopted a kind of novel light to believe the mark mode of head among the present invention program, promptly a light letter entrained information is made up of the wavelength and the polarization state of light pulse in the channel strip.The formation of the light grouping of polarized and mixed mark of wavelength light exchange is described below: on time domain, light letter head and light are surrounded by precedence, and each light letter head carries the routing iinformation of its corresponding light bag.The light bag that carries effective communication information works in the carrier wave of a certain specified wavelength, as meets the wavelength X in the DWDM wavelength series of ITUT regulation
0A light letter entrained routing iinformation is made up of the wavelength and the polarization state of light pulse, a light letter pulse wavelength is meant with light and wraps in wavelength in the same communication channel, polarization state as the polarization mark is meant circular polarization state or linear polarization, each light letter head is made up of the light pulse of some different wave lengths, and each light pulse has a kind of polarization state.
At signal exchange fringe node, electronics input and output ply-yarn drill is transported to the light bag packing processor of unpacking with the data message of user terminal traffic stream, notifies the signal control module with the routing iinformation of Business Stream simultaneously.The signal control module is according to the routing iinformation of the Business Stream of input, control wavelength mark generation module and polarization mark generation module produce the light letter head that corresponding light pulse and polarization state thereof by different wave length are formed jointly, the light bag packing light bag of the every generation of processor of unpacking just sends a signalisation signal control module, to insert wavelength division multiplexer together with the light bag through the letter of the light after strictness queuing and timing controlled head, the light grouping of multiplexing generation is sent to far-end signal exchcange core node by optical fiber.
At signal exchcange core node, the light letter head that wavelength mark detection module will arrive the light grouping of core node separates with the light bag, the wavelength optical signals of forming light letter head is input to polarization mark detection module, these light signals that carrying routing iinformation are by polarization mark detection module detection polarization information wherein, and again that the output of polarization mark detection module is complete optical routing information is to key control unit; The signal key control unit is finished the exchange of light bag according to the optical routing information Control optical switch switching matrix that detects, and the signal generation unit that control simultaneously is attached thereto produces next by the signal generation module and jumps light letter head; The light bag is by believing first wavelength division multiplexer that inserts corresponding output port with new light again behind the optical switch switching matrix, and the output port of wavelength division multiplexer is connected to destination node.
The present invention has increased substantially a letter portable amount of information by introduce the method for special light polarization state in the wavelength mark, and the information that n wavelength can carry will enlarge 1.5
nDoubly, promoted the performance of overall optical tag switching network, having kept multi-wavelength light label switched method does not simultaneously need the outer wavelength resource of occupying volume, and light letter head such as handles easily at advantage.The present invention can effectively reduce because the polarization axis direction that the long-distance optical fiber transmission causes changes the influence that is brought, because the polarization mark that uses is linear polarization and circular polarization state, has overcome the deficiency that polarization axis direction can rotate in the transmission to a certain extent.And can merge with existing label switching well along with development of technologies, being smoothly transitted into desirable optical packet switching technique, comparatively fast practicability, and cost is lower, and is simple in structure, realizes easily.
Description of drawings
Fig. 1 is the fringe node structure chart of medium wavelength polarized and mixed mark of the present invention.
Fig. 2 is the core node structure chart of medium wavelength polarized and mixed mark of the present invention.
Fig. 3 conciliates explanation partially for the loading of polarization mark among the present invention.
Fig. 4 is the structural representation of polarization mark generation module of the present invention.
Fig. 5 is the structural representation of single channel polarization mark detection module of the present invention.
Embodiment
In order to understand technical scheme of the present invention better, execution mode is further described below in conjunction with accompanying drawing.
The optical packet switching system of polarized and mixed mark of wavelength of the present invention comprises: signal exchange fringe node and signal exchcange core node.Its annexation is: the computer user's terminal that is used to demonstrate connects signal exchange fringe node by cable, signal exchange fringe node links to each other with signal exchcange core node by optical fiber, between signal exchcange core node and the signal exchcange core node through optical fiber interconnections.
Fig. 1 has provided the signal exchange fringe node structural representation among the present invention, signal exchange fringe node produces the light grouping, and its main functional modules comprises: electronics input and output ply-yarn drill, the packing of light bag unpack processor, signal control module, wavelength mark generation module, polarization mark generation module and wavelength division multiplexer.
User terminal and electronics input-output line card connection, the output of electronics input and output ply-yarn drill connects light bag packing unpack processor and signal control module respectively, the output of electronics input and output ply-yarn drill connects the signal control module, the unpack output of processor of light bag packing connects signal control module and wavelength division multiplexer respectively, the output of signal control module is connected with wavelength mark generation module and polarization mark generation module respectively, the output of wavelength mark generation module is connected with polarization mark generation module, the output of polarization mark generation module is connected to wavelength division multiplexer, and the output of wavelength division multiplexer is connected to signal exchcange core node.
Electronics input and output ply-yarn drill is transported to the light bag packing processor of unpacking with the data message of user terminal traffic stream, notifies the signal control module with the routing iinformation of Business Stream simultaneously.The signal control module is according to the routing iinformation of the Business Stream of input, and control wavelength mark generation module and polarization mark generation module produce corresponding light letter head, and this light letter head is made of jointly the light pulse and the polarization state thereof of different wave length.The light bag packing light bag of the every generation of processor of unpacking just sends a signalisation signal control module, to insert wavelength division multiplexer together with the light bag through the letter of the light after strictness queuing and timing controlled head, the light grouping of multiplexing generation is sent to far-end signal exchcange core node by optical fiber.
Fig. 2 is signal exchcange core node structure figure of the present invention.As shown in Figure 2, the main functional modules of signal exchcange core node comprises: wavelength mark detection module, the polarization mark detection module, signal key control unit, optical switch switching matrix, signal generation module and the output wave division multiplexer that are made of several single channel light polarization detecting units.
Wavelength mark detection module links to each other with the output of signal exchange fringe node, wavelength mark detection module separates light letter head with the light bag, the output of light letter head is connected to polarization mark detection module, the output of light bag is connected to the optical switch switching matrix, polarization mark detection module is connected with the signal key control unit, the route control output of signal key control unit is connected to the optical switch switching matrix, the control output of next Lu Guangxin head that the signal key control unit produces is connected to the signal generation module, and the output of the output of optical switch switching matrix and signal generation module is connected to the output wave division multiplexer together.
The light letter head that wavelength mark detection module will arrive the light grouping of core node separates with the light bag, and the wavelength optical signals of forming light letter head is input to polarization mark detection module.These light signals that carrying (wavelength) routing iinformation are by polarization mark detection module detection polarization information wherein, and again that the output of polarization mark detection module is complete optical routing information is to key control unit.The signal key control unit is mainly finished the detection of route optical information, the control of optical switch matrix and the functions such as generation of new routing information, promptly according to the optical routing information Control optical switch switching matrix that detects, finish the exchange of light load, the signal generation unit that control simultaneously is attached thereto produces next by the signal generation module and jumps light letter head.The light bag is by believing first output wave division multiplexer that inserts corresponding output port with new light again behind the optical switch switching matrix.The output port of output wave division multiplexer is connected to destination node.
Fig. 3 describes the process of the loading and the extraction of polarization mark of the present invention in detail.Wavelength mark generation module produces the linearly polarized light of different wave length with distributed Feedback (DFB) laser, be input to polarization mark generation module, polarization mark generation module determines every road output polarization state of light (comprising linear polarization, circular polarization state) according to the control information of signal control module input.Polarization mark detection module is made up of several single channel light polarization detecting units, extracts the polarization state of corresponding wavelength pulse by single channel light polarization detecting unit.
Fig. 4 is the structural representation of polarization mark generation module.As shown in Figure 4, polarization mark generation module comprises a high-speed optical switch, three 1 * 2 polarization-maintaining couplers, 90 ° of circulators.Three 1 * 2 polarization-maintaining couplers are respectively input coupler, intergrade coupler, output coupler.
According to the theory structure of control level output circularly polarized light or linearly polarized light, signal transmits from left to right.Because only producing of wavelength mark generation module output by the Distributed Feedback Laser of high linear polarization characteristic, so the input light of polarization mark generation module is linearly polarized light in fact, high-speed optical switch in the polarization mark generation module is controlled by the level of signal control module, if it is straight-through to need the output of line polarisation then to control light path, if it is tiltedly logical to need circularly polarized light output then to control light path, the straight-through output of high-speed optical switch is directly connected to output coupler, input coupler is received in the tiltedly logical output of high-speed optical switch, input coupler is output as the parallel linearly polarized light in two-way polarization direction, one the tunnel is directly connected to the intergrade coupler, another road is connected to the intergrade output coupler behind 90 ° of circulators, the control light path makes two-way light phase difference just in time be pi/2, and the output of intergrade coupler is connected to another input of output coupler.All optical fiber all use polarization maintaining optical fibre in this module.
Fig. 5 is the principle assumption diagram of single channel light polarization detecting unit among the present invention.As shown in Figure 5, single channel light polarization detecting unit is 45 ° polarization beam splitter (PBS) formation by an optical splitter and two main shafts,
Input light (linear polarization or circular polarization state) is through optical splitter to two main shaft on 45 ° the polarization beam splitter PBS, and PBS will import the light that light is divided into two-way polarization direction quadrature.If circularly polarized light input, then the light intensity of two-way output should equate, if linearly polarized light input, then two paths of signals should be an isocandela not, just differentiate when (near scope as 1) in threshold range when the ratio of two paths of signals power and to be circularly polarized light, just differentiate outside this scope when ratio and be linearly polarized light.
Consider the input light polarization direction just in time with PBS in two polarizer polarization directions when at 45 beam intensity ratio also be 1, adopt 2 groups of polarization axle PBS at 45 to carry out two-way relatively, even linear polarization direction of light and one of them PBS two polarization axle angles are 45 ° like this, other one the tunnel also can effectively detect its polarization state, thereby extracts the polarization mark.
Among the present invention, user terminal carries out high speed business stream by cable and signal exchange fringe node and sends and receive, what directly link to each other with user terminal in the signal exchange fringe node is electronics input and output ply-yarn drills, this ply-yarn drill is responsible for receiving from the 10M/100M electricity ether packet of terminal and is responsible for data message is transmitted to the light bag packing processor of unpacking, notify the signal control module with the destination address of Business Stream correspondence simultaneously, the signal control module is tabled look-up according to the routing iinformation of receiving, and be ready to the control information of optical routing, wait for the unpack notice of processor of light packing.The light bag packing processor of unpacking is dispensed to corresponding data centralization formation queuing according to the service priority and the destination address of packet, when a light seal the dress finish after, the light bag packing processor of unpacking sends the notification to the signal control module, drives it and produces the signal control signal.The signal control module links to each other with polarization mark generation module with wavelength mark generation module, wavelength mark generation module produces the light pulse of different wave length combination according to the level of control line, these light pulses are connected to polarization mark generation module by polarization maintaining optical fibre again, polarization mark generation module is controlled the polarization state of light pulse equally according to control information, polarization state is defined by the designer, and is corresponding with signal exchcange core node polarization mark detection module.Behind light letter head that will produce and the strict fixed time interval of light bag, send first multiplexing wavelength division multiplexer that enters of Guang Bao and light letter and export through optical fiber.
At signal exchcange core node, through wavelength mark detection module, separated light is believed head and light bag to input light earlier, and the light pulse of different wave length also shunts in the different fiber in the light letter head.Polarization mark detection module is delivered in the light pulse of different wave length, and the polarization mark module is made up of a plurality of single channel light polarization detecting units, detects the polarization state of the light pulse of different wave length respectively, and different polarization states is represented different routing iinformations respectively.Routing iinformation after core node is separated partially by the photodetector detection, obtain the entrained routing iinformation of letter head, and according to these routing iinformations generation control level control switching matrixs, set up the output light path of light bag correspondence, the light bag exchanges to output port through the optical switch switching matrix, carries out outputing to next jump cursor note exchcange core node or receiving signal after multiplexing exchanging fringe node jumping light letter head with next.
The present invention has increased the amount of information that the letter head can carry greatly, effectively reduces because the polarization axis direction that the long-distance optical fiber transmission causes changes the influence that is brought.Because the polarization state as the polarization mark is circular polarization state and linear polarization, so the method for direct detection can be adopted in the test side.Polarization mark detection module uses and allows the light pulse of input pass through polarization beam splitter earlier earlier, and the way that the light intensity of the orthogonal output light in two-way polarization direction is compared has shielded the influence that fibre-optical bending and chromatic dispersion are brought to a certain extent again.
Claims (4)
1. the optical packet switching system of a polarized and mixed mark of wavelength comprises signal exchange fringe node and signal exchcange core node, it is characterized in that:
Described signal exchange fringe node comprises electronics input and output ply-yarn drill, the packing of light bag unpack processor, signal control module, wavelength mark generation module, polarization mark generation module and wavelength division multiplexer; Electronics input and output ply-yarn drill is connected with user terminal, the output of electronics input and output ply-yarn drill connects light bag packing unpack processor and signal control module respectively, the output of electronics input and output ply-yarn drill connects the signal control module, the unpack output of processor of light bag packing connects signal control module and wavelength division multiplexer respectively, the output of signal control module is connected with wavelength mark generation module and polarization mark generation module respectively, the output of wavelength mark generation module is connected with polarization mark generation module, the output of polarization mark generation module is connected to wavelength division multiplexer, and the output of wavelength division multiplexer is connected to signal exchcange core node;
Electronics input and output ply-yarn drill is transported to the light bag packing processor of unpacking with the data message of user terminal traffic stream, notify the signal control module with the routing iinformation of Business Stream simultaneously, the signal control module is according to the routing iinformation of the Business Stream of input, control wavelength mark generation module and polarization mark generation module produce the light letter head that corresponding light pulse and polarization state thereof by different wave length are formed jointly, the light bag packing light bag of the every generation of processor of unpacking just sends a signalisation signal control module, to insert wavelength division multiplexer together with the light bag through the letter of the light after strictness queuing and timing controlled head, the light grouping of multiplexing generation is sent to far-end signal exchcange core node by optical fiber;
Polarization mark detection module, signal key control unit, optical switch switching matrix, signal generation module and output wave division multiplexer that described signal exchcange core node comprises wavelength mark detection module, is made of several single channel light polarization detecting units; Wavelength mark detection module links to each other with the output of signal fringe node, wavelength mark detection module separates light letter head with the light bag, the output of light letter head is connected to polarization mark detection module, the output of light bag is connected to the optical switch switching matrix, polarization mark detection module is connected with the signal key control unit, the route control output of signal key control unit is connected to the optical switch switching matrix, next Lu Xintou control output that the signal key control unit produces is connected to the signal generation module, and the output of the output of optical switch switching matrix and signal generation module is connected to the output wave division multiplexer together;
The light letter head that wavelength mark detection module will arrive the light grouping of core node separates with the light bag, the wavelength optical signals of forming light letter head is input to polarization mark detection module, these light signals that carrying routing iinformation are by polarization mark detection module detection polarization information wherein, and again that the output of polarization mark detection module is complete optical routing information is to key control unit; The signal key control unit is finished the exchange of light load according to the optical routing information Control optical switch switching matrix that detects, and the signal generation module that control simultaneously is attached thereto produces next by the signal generation module and jumps light letter head; The light bag is by believing first output wave division multiplexer that inserts corresponding output port with new light again behind the optical switch switching matrix, and the output port of output wave division multiplexer is connected to destination node.
2. according to the optical packet switching system of the polarized and mixed mark of wavelength of claim 1, it is characterized in that described polarization state is circular polarization or linear polarization.
3. according to the optical packet switching system of the polarized and mixed mark of wavelength of claim 1 or 2, it is characterized in that described polarization mark generation module comprises high-speed optical switch, three 1 * 2 polarization-maintaining couplers, 90 ° of circulators; Three 1 * 2 polarization-maintaining couplers are respectively input coupler, intergrade coupler, output coupler; The straight-through output of high-speed optical switch is directly connected to output coupler, input coupler is received in the tiltedly logical output of high-speed optical switch, input coupler is output as the parallel linearly polarized light in two-way polarization direction, one the tunnel is directly connected to the intergrade coupler, another road is connected to the intergrade coupler behind 90 ° of circulators, the output of intergrade coupler is connected to output coupler.
4. according to the optical packet switching system of the polarized and mixed mark of wavelength of claim 1 or 2, it is characterized in that described single channel light polarization detecting unit is 45 ° polarization beam splitter by an optical splitter and two main shafts and constitutes, input light is on optical splitter to two main shaft polarization beam splitter at 45, the light that is divided into two-way polarization direction quadrature, whether judge in threshold range that according to the ratio of two paths of signals power the polarization state of light that receives is linear polarization or circular polarization state, thereby extract the polarization mark.
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| US9473263B2 (en) * | 2015-01-16 | 2016-10-18 | Huawei Technologies Co., Ltd. | Method and system for removing a pilot tone from an optical signal |
| CN113206703B (en) * | 2021-04-19 | 2022-06-03 | 烽火通信科技股份有限公司 | Wavelength division multiplexing chromatic dispersion and polarization mode dispersion monitoring method and device |
| CN113253539B (en) * | 2021-05-31 | 2022-04-19 | 南京邮电大学 | All-optical packet switch based on integrated SOA series tunable laser |
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| CN1404236A (en) * | 2002-10-24 | 2003-03-19 | 上海交通大学 | Light-controlled light exchange structure adopting multiband mark |
| CN1555147A (en) * | 2003-12-25 | 2004-12-15 | 上海交通大学 | Integrated dynamic light add and drop multiplexer module based on filter wave light switch unit |
| CN1588825A (en) * | 2004-07-08 | 2005-03-02 | 上海交通大学 | Light burst exchange network edge node structure and realizing method |
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| CN1404236A (en) * | 2002-10-24 | 2003-03-19 | 上海交通大学 | Light-controlled light exchange structure adopting multiband mark |
| CN1555147A (en) * | 2003-12-25 | 2004-12-15 | 上海交通大学 | Integrated dynamic light add and drop multiplexer module based on filter wave light switch unit |
| CN1588825A (en) * | 2004-07-08 | 2005-03-02 | 上海交通大学 | Light burst exchange network edge node structure and realizing method |
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