CN1188239A - Optical protection switching system - Google Patents
Optical protection switching system Download PDFInfo
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- CN1188239A CN1188239A CN97123482A CN97123482A CN1188239A CN 1188239 A CN1188239 A CN 1188239A CN 97123482 A CN97123482 A CN 97123482A CN 97123482 A CN97123482 A CN 97123482A CN 1188239 A CN1188239 A CN 1188239A
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Abstract
An optical line protection switching system is realized by employing a plurality of rare earth-doped fiber optical amplifiers as gain-switched optical connections, for example gain-switched optical distributors, i.e., commutators, and/or gain-switched optical selectors in a gain switched optical line protection switching system. In one embodiment, at least one or more gain switched optical distributors are employed to realize so-called head-end switching of an incoming optical signal and one or more gain switched optical selectors are employed to realize so-called tail-end switching of the optical signal to form a 1x1 (1xN) optical line protection switching system.
Description
The present invention relates to protect exchange system, relate in particular to the Optical Line Protection exchange system.
Known existing Optical Line Protection exchange system uses dynamo-electric light replacement part as divider and selector switch.
The optical mode plan that light N * 1 selector switch is an electronics N * 1 selector switch, input and output port is the optical fiber with the different one or more communicate optical signals of wavelengths travel here.Some selector switch can allow the selection of an above input port and add (under some rule) signal from the port of selecting.This suitably is called the capacity gauge of selector switch.
The light distributor of many electromechanics and selector switch current be obtainable.These devices be based on mechanically mobile input and/or output optical fibre or utilize various reflections or the deflection parts with space ground guiding from the light beam of the emergent pupil of input optical fibre and send the entrance pupil that its arrives output optical fibre.Obviously, these mechanical switchs be at a slow speed and broadcast-capable (a kind of characteristic that requires in communication system) in most of the cases can not be arranged.In some cases, relevant with these parts optical loss is significant.
The light distributor that this use is dynamo-electric and the existing cross connection device of selector switch are restricted to once can only select a circuit, and their speed is slow, and their reliability is lower than what require.
In one embodiment of the invention; by using a plurality of rare-earth doped optical fibre image intensifers to connect as the exchange light that gain is arranged; the exchange light distributor that gain is for example arranged; promptly the commutator in an exchange Optical Line Protection exchange system that gain arranged and/or the exchange optical selector of gain is arranged has solved problem and the restriction of using the existing known Optical Line Protection exchange system of dynamo-electric electro-optical device.In one embodiment, at least one or a plurality of exchange light distributor that gain arranged are used to realize that the exchange of head end of so-called input optical signal and one or more exchange optical selector that gain arranged are used to realize that the exchange of end of so-called light signal is with (1 * N) the Optical Line Protection exchange system that forms 1 * 1.In another embodiment, an input optical signal is bridged to one or more light paths, and terminal exchange be by use that one or more exchange optical selectors that gain arranged realize to form a 1+1 (1+N) Optical Line Protection exchange system.
Each rare-earth doped optical fibre image intensifer is used as a connection/stopcock.Simultaneously, exchange light distributor that gain is arranged that uses in the optical cross connection device of less loss in this invention and/or exchange optical selector that gain is arranged all are fit to the light amplification optical communication system of today naturally.In a device, select circuit to realize this point jointly together with a plurality of pumps and a plurality of corresponding rare-earth doped optical fibre image intensifer by using a pump.Select specific pump and corresponding image intensifer to determine which or which output port is connected to input port by using a control circuit device.In another device, use a so-called tuning pumping unit together with a plurality of wave filters and corresponding a plurality of rare-earth doped optical fibre image intensifer.Pump tuner is used to control tunable pump so that in a plurality of image intensifers of selecting to be triggered suitable one, if use broadcast behavior like this, arrives corresponding outlet line with any one transmission input signal in a plurality of setted wavelengths.
Fig. 1 has illustrated that a utilization has the light distributor of the exchange of gain to be used for the head end exchange and has the exchange optical selector of gain to be used for one 1 * 1 (embodiment of 1 * N) Optical Line Protection exchange system of terminal exchange.
Fig. 2 has illustrated an embodiment who utilizes head end bridge joint and the exchange optical selector that gain is arranged to be used for a 1+1 (1+N) the Optical Line Protection exchange system of terminal exchange.
Fig. 3 A and 3B have showed two exchange image intensifer devices that gain is arranged with the form of simplifying, and wherein each can be used for embodiments of the invention.
Fig. 4 has illustrated that a use has the light distributor of the so-called exchanging pump of rare-earth doped optical fibre image intensifer.
Fig. 5 has showed that is utilized a light distributor that comprises the tuning pumping unit of rare-earth doped optical fibre image intensifer.
Fig. 6 has showed a light distributor device that comprises a plurality of exchanging pumps and corresponding rare-earth doped optical fibre image intensifer.
Fig. 7 has illustrated that a use has the optical selector of the so-called exchanging pump of rare-earth doped optical fibre image intensifer.
Fig. 8 has showed that is used an optical selector that comprises the tuning pumping unit of rare-earth doped optical fibre image intensifer; And
Fig. 9 has showed that is utilized an optical selector that comprises the exchanging pump device of a plurality of pumps and corresponding rare-earth doped optical fibre image intensifer.
Fig. 1 has illustrated that a utilization has the exchange light distributor of gain to be used for the head end exchange and has the exchange optical selector of gain to be used for one 1 * 1 (embodiment of 1 * N) Optical Line Protection exchange system of terminal exchange.Especially, what be illustrated in head end is that input 101 is used to receive an input optical signal, and this light signal offers optical star coupler 102 (a type known in the art).Adopt coupling mechanism 102 with light signal that a supply is provided to the exchange image intensifer (GSOA) 103 and 108 that gain is arranged.The image intensifer that uses in GSOA103 and 108 can be a type shown in any among Fig. 3 A of describing below or Fig. 3 B.Here suppose that the pump that is used for GSOA103 and 108 is included in pump controller 111.Pump controller 111 responses are from the control signal of network control and administrative unit 113.Parts 101,102,103,108,111 and 113 form one to be had the exchange light distributor of gain and can be a type shown in any one and being described below among Fig. 4,5 or 6.According to which is switched among the GSOA 103 and 108 under pump controller 111 control, offer lossy optical fiber or light device 104 or lossy optical fiber or light device 109 via GSOA 103 or GSOA 108 from the light signal of coupling mechanism 102.Endways, the light signal from lossy optical fiber or light device 104 and lossy optical fiber or light device 109 offers GSOA 105 and GSOA110 respectively.Output from GSOA 105 and 110 offers optical star coupler 106 and arrives output optical fibre 107 later on.The image intensifer that uses in GSOA105 and 110 also can be a type shown in any one among Fig. 3 A of describing below or Fig. 3 B.Suppose that also the pump that is used for GSOA 105 and 110 is included in pump controller 112.Pump controller 112 response from the control signal of network control and administrative unit 113 to connect suitable among the GSOA 105 and 110.Parts 105,110,106,107,112 and 113 form one to be had the exchange optical selector of gain and can be a type shown among Fig. 7,8 or 9 any one and be described below.Obviously for to form two GSOAs of an effective optical communication path in that path must be that connect and these GSOA on backup path must turn-off.Like this, if effectively the path is made up of parts 101,102,103,104,105 and 106, GSOA 103 and GSOA 105 must be connected respectively by pump controller 111 and pump controller 112, and GSOA 108 and GSOA 110 must be turn-offed respectively by pump controller 111 and pump controller 112.Standby path comprises parts 101,102,108,109,110,106 and 107.Attention is described 1 * 1 Optical Line Protection system in order to explain succinctly and only to know, unique has here used one the exchange light distributor of gain to be arranged and used an exchange optical selector that gain is arranged endways at head end.Yet, for obviously know the embodiment that how easily expands to a 1 * N those skilled in the art.
Fig. 2 has illustrated an embodiment who utilizes head end bridge joint and the exchange optical selector that gain is arranged to be used for a 1+1 (1+N) the Optical Line Protection exchange system of terminal exchange.1+1 Optical Line Protection exchange system has as shown in Figure 2 utilized the most of parts that use among the embodiment of Fig. 1 with them in the same mode of Fig. 1.Therefore, those parts have similar numbering as Fig. 1 and will no longer at length explain.In an illustrated embodiment, use bridge joint, and use exchange endways at head end.Terminal exchange is identical with what use in Fig. 1.Because bridge joint uses at head end, do not need GSOA 103 (Fig. 1), GSOA 108, pump controller 111 and network control and administrative unit 113.Attention pump control function can be finished through 112 ground of pump controller endways.So in this example, effectively optical communication path can comprise parts 101,102,104,105,106 and 107.Make GSOA 105 connections and make GSOA 110 connections realize this point through pump controller 112 through pump controller 112.Form backup path by parts 101,102,109,110,106 and 107 then.Attention is described 1+1 Optical Line Protection system in order to explain succinctly and only to know, unique has here used the light bridge joint and used an exchange optical selector that gain is arranged endways at head end.Yet, for obviously know the embodiment that how easily expands to a 1+N those skilled in the art.
Fig. 3 A and Fig. 3 B have showed two exchange image intensifers that gain is arranged with the form of simplifying, and this amplifier can be used for embodiments of the invention.Especially, Fig. 3 A has showed and has used an exchange image intensifer that gain is arranged of pump in the same way.Like this, the input terminal 301 of displaying is crossed Wave division multiplexing (WDM) coupling mechanism 303 at this example back warp provides an input optical signal to image intensifer and import 302 and also pass through Wave division multiplexing (WDM) coupling mechanism 303 at this example back warp by it and provide a pump signal to image intensifer.Also showed a rare-earth doped optical fibre image intensifer 304, it can be the length of the requirement of erbium oxide doped fiber for example, still, also can use other rear-earth-doped parts valuably.Also showed a selectable optoisolator 305.The parts that use in the image intensifer that Fig. 3 B shows are identical with those parts in Fig. 3 A use, and difference has been to use reverse pumping.Therefore, WDM coupling mechanism 303 be positioned at rare-earth doped optical fibre amplifier 304 output terminal and in selectable optoisolator 305 fronts.In addition, should notice that pump also can be two-way.Be also noted that loss is gained by the pump power equilibrium by the length equilibrium of rare-earth doped optical fibre.
Fig. 4 has showed an exchange light distributor that gain is arranged that comprises fibre circuit 401 in simplified form, and fibre circuit 401 provides the light signal branch of presetted wavelength or set of wavelengths to be clipped to rare-earth doped optical fibre image intensifer (hereinafter referred to as " amplifier ") 403 and amplifier 404 through optical star coupler (hereinafter referred to as " coupling mechanism ") 402.For example, rare-earth doped optical fibre can be the length that is coupled to the erbium oxide doped fiber of wavelength selective coupler, is coupled to the there through pump of this coupling mechanism.Two such rare-earth doped optical fibre image intensifers shown in Fig. 3 A and 3B and as mentioned above.As directed, pump 404 is coupled to amplifier 403, and pump 406 is coupled to amplifier 405.As known in the art, the driving amplifier 403 and 405 respectively of each in the pump 404 and 406. Amplifier 403 and 405 input are the identical copies of input signal on circuit 401 that is provided by coupling mechanism 402, and this coupling mechanism is 2 * N coupling mechanism of a known manner in this example.Amplifier 403 and 405 output are connected to output port 407 and 408 through selectable light monitoring tap (hereinafter referred to as " tap ") 409 and 411.Tap 409 and picked out in 411 minutes output light signal sub-fraction (for example 1-10%) and make light signal arrive photodetector (photoelectric commutator, O/E) 410 and 412 respectively.O/E410 and 412 helps to handle which and definite parameter relevant with selecting circuit and identification (ID) mark of determining by in the current selective amplifier 403 of power level and 405 of selecting circuit (for example see common unsettled U.S. Patent Application Serial 08/579529, apply for Dec 27 nineteen ninety-five).Information from O/E 410 and 412 offers pump selector circuit 413, this circuit subsequently as requested parameter and from the order and the command selection pump 404 or the pump 406 of control module 414.Yet should notice that this supervising device is can similarly use in selectable and known in the art other light monitoring and the control device.This is conspicuous for those skilled in the art.What be also supplied to that pump selects circuit 413 is order and control information from order and control module 414, unit 414 is used to the information of other network componentses in a photosystem, so that in the selecteed pump 404 or 406 which selection wants, therefore which is switched in the selective amplifier 403 or 405, and which is turned off.Yet should note, though we have showed the use of O/ E 410 and 412 in this example, other device also can use to monitor different parameters so that select some in the pump 404 and 406, so some will being switched in amplifier 403 and 405.
Fig. 5 with the form of simplifying showed another exchange light distributor that gain is arranged be used to distribute light signal from an input optical fibre circuit 501 to a plurality of output optical fibre circuit 511-1 to 511-N and corresponding a plurality of amplifier 503-1 to 503-N.Note only requiring a tunable pump 509, this has given us cost-effective technological merit.Be relevant to tunable pump 509 be another optical star coupler (hereinafter referred to as " coupling mechanism ") 510 and a plurality of fixing (maybe can preset) optical band pass filters (hereinafter referred to as " wave filter ") 504-1 to 504-N, the man-to-man amplifier 503-1 that is relevant to respectively of these wave filters is to 503-N.In fact, these wave filters 504-1 can be added in the wavelength selective coupler to 504-N, and this coupling mechanism is used to construct amplifier 503-1 to 503-N (seeing the document of the CONSTRUCTED SPECIFICATION that is used for various image intensifer designs).In addition, be sent to the output port 511-1 of system before the 511-N, amplifier 503-1 offers selectable tap 505-1 to the output of 503-N and is used for the purpose intactly monitored to 506-N by watch-dog 506-1 to 505-N.In addition, O/E device 506-1 also makes up wavelength with tuning tunable pump 509 with information from order and control module 508 to the output of 506-N in pump tuned circuit 507.
Fig. 6 has showed the exchange light distributor that another has gain with the simplified block diagram form, this divider use a single incoming line 601 and a plurality of output optical fibre circuit 609-1 to 609-N and corresponding a plurality of amplifier 603-1 to 603-N.Notice that corresponding a plurality of pump 604-1 is relevant to amplifier 603-1 to 603-N respectively to 604-N.Equally, be sent to the output port 609-1 of system before the 609-N, amplifier 603-1 offers tap 605-1 to the output of 603-N and is used for the purpose intactly monitored to 606-N by O/E 606-1 to 605-N.Equally, O/E device 606-1 also with from the information of order and control module 608 selects combination in the circuit 607 to trigger pump 604-1 in the 604-N (if perhaps require broadcast a plurality of) at pump to the output of 606-N, and the result is tuning subsequently, and corresponding amplifier 603-1 turns on and off to 603-N.Yet should notice that other optically-coupled known in the art and supervising device can be by identical use to replace photo-coupler 605-1 to 605-N and corresponding element.This is conspicuous for those skilled in the art.Especially, in this example, O/E 606-1 is relevant to the power level of the output signal of output optical fibre 605-1 in the 605-N to each monitoring of 606-N, and determines that the parameter and the ID mark that are relevant to that signal are used for the operation of divider switch and the check of characteristic.
Fig. 7 has showed an exchange optical selector that gain is arranged that comprises fibre circuit 701 and 702 with the form of simplifying, and it provides the light signal branch to be clipped to rare-earth doped optical fibre image intensifer (hereinafter referred to as " amplifier ") 703 and amplifier 704 at presetted wavelength or set of wavelengths.For example, rare-earth doped optical fibre can be the length that is coupled to the erbium oxide doped fiber of wavelength selective coupler, is coupled to the there through pump of this coupling mechanism.As directed, pump 705 is coupled to amplifier 703, and pump 706 is coupled to amplifier 704.As known in the art, the driving amplifier 703 and 704 respectively of each in the pump 705 and 706.Amplifier 703 and 704 output are made up in known manner by an optical star coupler (hereinafter referred to as " coupling mechanism ") 707.The coupling mechanism 707 that is used for two line terminals is known three-dB couplers.The main output of coupling mechanism 707 is provided to output optical fibre 711 as an output, and this optical fiber can be connected to a receiver or the remote optical fiber that transmits.The auxiliary output of coupling mechanism 707 is provided to photoelectric commutator (O/E) 708, these converter 708 monitoring are selected the power level of circuit and are determined the parameter relevant with selecting circuit and ID (identification) mark (for example see common unsettled U.S. Patent Application Serial 08/579529, apply for Dec 27 nineteen ninety-five).Information from O/E 708 offers pump selector switch 709, and this selector switch parameter is as requested selected pump 705 or pump 706 then.Yet should notice that other optically coupled devices known in the art can similarly be used to replace coupling mechanism 707.This is conspicuous for those skilled in the art.The auxiliary output that should note offering from coupling mechanism 707 O/E 708 is selectable.Output from O/E 708 offers pump selection circuit 709, and it is used to improve further the pump selection course here.Especially, in this example, the power level of signal is selected in O/E 708 monitoring, and determines to offer the relevant parameter and the ID mark of selection circuit of coupling mechanism 707.Equally, what offer that pump selects circuit 709 is order and control information from order and control module 710, this order and control module 710 are used to the information of other network componentses in a photosystem so which selects in the pump 705 or 706 selected, thus in selective amplifier 703 or 704 which will through coupling mechanism 707 provide a light signal to output optical fibre 711 as an output.Yet should note, though we have showed the use of O/E 708 in this example, other device can be used to monitor different parameters so that select in the pump 705 and 706 which, and therefore which will provide output in the selective amplifier 703 and 704.
Fig. 8 has showed that with the form of simplifying another exchange optical selector that gain is arranged is used to select one from the light signal of a plurality of fibre circuit 801-1 to 801-N and corresponding a plurality of rare-earth doped optical fibre image intensifer 802-1 to 802-N.In being arranged, only used the exchange optical selector of gain a tunable pump 808, this pump is coupled to wave filter 803-1 each in the 803-N by optical star coupler (hereinafter referred to as " coupling mechanism ") 809, and this coupling mechanism provides cost-effective technological merit to us.A plurality of wave filter 803-1 are relevant to 802-N with amplifier 802-1 one to one respectively to 803-N.Equally, amplifier 802-1 offers optical star coupler (hereinafter referred to as " coupling mechanism ") 804 to the output of 802-N.The main output of coupling mechanism 804 provides system's output and is provided for output optical fibre 811, and this output optical fibre 811 can be connected to a receiver or the remote optical fiber that transmits.The auxiliary output of coupling mechanism 804 is provided to power monitoring unit 805, the power level of this monitoring unit monitoring selection circuit and definite parameter relevant with selecting circuit and ID (identification) mark (are for example seen common unsettled U.S. Patent Application Serial 08/579529, as mentioned above).Information from O/E 805 offers pump tuned circuit 806, and this tuned circuit as requested parameter is subsequently selected pump 803-1 in the 803-N.Yet should notice that other optically coupled devices known in the art can similarly be used to replace coupling mechanism 804.But, though should notice that we have showed the use of O/E 805 in this example, other device can use to monitor different parameters so that adjust pump tuned circuit 806 and therefore adjust tunable pump 808, the result, and amplifier 802-1 some in the 802-N will provide output.This is conspicuous for those skilled in the art.The auxiliary output that should note offering from coupling mechanism 804 O/E 805 is selectable.Output from O/E 805 offers pump tuned circuit 806, and it is used to improve further the pump selection course here.Especially, in this example, the power level of signal is selected in O/E 805 monitoring, and determines to offer coupling mechanism 804 and select circuit relevant parameter and ID mark.Equally, what offer pump tuned circuit 806 is from the order and the order and the control information of control module 807, this order and control module 807 are used to the information of other network componentses in a photosystem so that select to want selecteed wavelength, thus amplifier 802-1 in the 802-N some will through coupling mechanism 804 provide a light signal to output optical fibre 811 as an output.Be provided to wave filter 803-1 to 803-N from the output of tunable pump 808 through coupling mechanism 809, this wave filter subsequently selective amplifier 802-1 in the 802-N suitable one to provide one to output to coupling mechanism 804.
Fig. 9 has showed the exchange optical selector that another has gain with the simplified block diagram form, this selector switch use a plurality of fibre circuit 901-1 to 901-N and corresponding a plurality of rare-earth doped optical fibre amplifier (hereinafter referred to as " amplifier ") 902-1 to 902-N.Have in the exchange selector switch of gain at this, corresponding a plurality of pump 903-1 are relevant to amplifier 902-1 to 902-N respectively to 903-N.In this example, offer an optical star coupler (hereinafter referred to as " coupling mechanism ") 904 from amplifier 902-1 to the output of the light of 902-N.Yet should be noted that other optically coupled devices known in the art can similarly be used to replace coupling mechanism 904.This is conspicuous for those skilled in the art.The main output of star-type coupler 904 is provided to the output of optical fiber 908, and the while is provided to photoelectric commutator (O/E) 905 from the auxiliary output of coupling mechanism 904 in this example.Should notice that the auxiliary output from coupling mechanism 904 is selectable.Output from O/E 905 offers pump selection circuit 906, and it is used to improve further the pump selection course here.Especially, in this example, the power level of signal is selected in O/E 905 monitoring, and determines to offer the relevant parameter and the ID mark of selection circuit of coupling mechanism 904.Equally, what offer that pump selects circuit 906 is order and control information from order and control module 907, this order and control module 907 are used to the information of other network componentses in a photosystem so that select to want selecteed pump 903, thus in the amplifier 902 some will through coupling mechanism 904 provide a light signal to output optical fibre 908 as an output.
Claims (22)
1. an optical protection switching system has an input end and an output terminal, comprising:
An input photo-coupler is used to be coupled an input optical signal to a plurality of optical communication apparatus;
A plurality of have the exchange image intensifer (GSOA) of gain to be relevant to described a plurality of described optical communication equipment one to one;
Pumping unit is used to control each turn-on/off state of a plurality of exchange image intensifers that gain arranged with a received signal of the control input light path by light output end;
There is the output of the exchange image intensifer of gain to be provided to light output end from described through a photo-coupler.
2. optical protection switching system as claimed in claim 1, wherein each in the image intensifer comprises that the corresponding pump of a light rare-earth doped optical fibre with predetermined length and a response command signal is used for the connection/shutoff of image intensifer.
3. optical protection switching system as claimed in claim 2, wherein optical fiber is erbium doped.
4. optical protection switching system as claimed in claim 2, the pumping unit that wherein is relevant to rare-earth doped optical fibre are configured to the pumping in the same way that the rare-earth doped optical fibre image intensifer is provided.
5. optical protection switching system as claimed in claim 2, the pumping unit that wherein is relevant to rare-earth doped optical fibre is configured to the backward pumping that the rare-earth doped optical fibre image intensifer is provided.
6. optical protection switching system as claimed in claim 1; wherein each of image intensifer comprises a light rare-earth doped optical fibre and the corresponding wave filter with predetermined length; pumping unit comprises that a tunable pump and pump tuned circuit and coupling mechanism are used to be coupled from the wave filter corresponding to each of a plurality of image intensifers of outputing to of tunable pump; pump tuned circuit response command and control signal are used for controlling tunable pump providing the pump signal to be used to connect/turn-off the one or more of a plurality of image intensifers, and filter filtering pump signal is to realize one or more in a plurality of image intensifers of connection/shutoff.
7. optical protection switching system as claimed in claim 6, wherein optical fiber is the doping bait.
8. optical protection switching system as claimed in claim 6, the pumping unit that wherein is relevant to rare-earth doped optical fibre are configured to the pumping in the same way that the rare-earth doped optical fibre image intensifer is provided.
9. optical protection switching system as claimed in claim 6, the pumping unit that wherein is relevant to rare-earth doped optical fibre is configured to the backward pumping that the rare-earth doped optical fibre image intensifer is provided.
10. optical protection switching system as claimed in claim 1, wherein optical communication apparatus comprises a lossy optical link.
11. optical protection switching system as claimed in claim 1, wherein optical communication apparatus comprises optical communication equipment.
12. optical protection switching system as claimed in claim 1 also comprises a plurality of exchange image intensifers that gain is arranged; each has an input and an output, and wherein input is one to one with output is relevant to optical communication apparatus one to one from a plurality of outputs of importing photo-coupler are relevant.
13. optical protection switching system as claimed in claim 12, wherein each in the image intensifer comprises that the corresponding pump of a light rare-earth doped optical fibre with predetermined length and a response command signal is used for the connection/shutoff of image intensifer.
14. optical protection switching system as claimed in claim 13, wherein optical fiber is the doping bait.
15. optical protection switching system as claimed in claim 13, the pumping unit that wherein is relevant to rare-earth doped optical fibre are configured to the pumping in the same way that the rare-earth doped optical fibre image intensifer is provided.
16. optical protection switching system as claimed in claim 13, the pumping unit that wherein is relevant to rare-earth doped optical fibre is configured to the backward pumping that the rare-earth doped optical fibre image intensifer is provided.
17. optical protection switching system as claimed in claim 12; wherein each of image intensifer comprises a light rare-earth doped optical fibre and the corresponding wave filter with predetermined length; pumping unit comprises that a tunable pump and pump tuned circuit and coupling mechanism are used to be coupled from each wave filter corresponding to a plurality of image intensifers of outputing to of tunable pump; pump tuned circuit response command and control signal are used for controlling tunable pump providing the pump signal to be used to connect/turn-off the one or more of a plurality of image intensifers, and filter filtering pump signal is to realize one or more in a plurality of image intensifers of connection/shutoff.
18. optical protection switching system as claimed in claim 17, wherein optical fiber is the doping bait.
19. optical protection switching system as claimed in claim 17, the pumping unit that wherein is relevant to rare-earth doped optical fibre are configured to the pumping in the same way that the rare-earth doped optical fibre image intensifer is provided.
20. optical protection switching system as claimed in claim 17, the pumping unit that wherein is relevant to rare-earth doped optical fibre is configured to the backward pumping that the rare-earth doped optical fibre image intensifer is provided.
21. optical protection switching system as claimed in claim 12, wherein optical communication apparatus comprises a lossy optical link.
22. optical protection switching system as claimed in claim 12, wherein optical communication apparatus comprises optical communication equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97123482A CN1188239A (en) | 1996-12-31 | 1997-12-30 | Optical protection switching system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US777,892 | 1996-12-31 | ||
| CN97123482A CN1188239A (en) | 1996-12-31 | 1997-12-30 | Optical protection switching system |
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| Publication Number | Publication Date |
|---|---|
| CN1188239A true CN1188239A (en) | 1998-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97123482A Pending CN1188239A (en) | 1996-12-31 | 1997-12-30 | Optical protection switching system |
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| CN (1) | CN1188239A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1883226B (en) * | 2003-09-20 | 2011-09-07 | 爱立信股份有限公司 | Node for an optical communication network |
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1997
- 1997-12-30 CN CN97123482A patent/CN1188239A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1883226B (en) * | 2003-09-20 | 2011-09-07 | 爱立信股份有限公司 | Node for an optical communication network |
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