CN101997614B - Integrated transceiver, optical network system as well as optical communication system and method - Google Patents
Integrated transceiver, optical network system as well as optical communication system and method Download PDFInfo
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Abstract
The invention discloses an integrated transceiver, an optical network system as well as an optical communication system and method. The integrated transceiver comprises an optical receiver, an optical transmitter, a first optical branching device, and a second optical branching device, wherein the optical receiver responds to a first optical signal and generates a first electrical signal at a receiving electrical interface; the optical transmitter responds to a second electrical signal received at a transmitting electrical interface, and transmits a second optical signal; the first optical branching device receives the first optical signal at a receiving optical interface, and guides at least one part of the first optical signal to the optical receiver; the second optical branching device guides the second optical signal to a transmitting optical interface. The first optical branching device guides at least one part of the first optical signal to the second optical branching device. The second optical branching device transmits the part of the first optical signal received from the first optical branching device to the transmitting optical interface. The integrated transceiver, the optical network system as well as the optical communication system and method of the invention can provide more reliable communication.
Description
Technical field
The present invention relates to optical communication field, relate in particular to optical network system and the optical transceiver for this system.
Background technology
Popular along with the networking telephone (VoIP) and Web TV (IPTV), increasing user wishes to access these services from their guard station.Similarly, business user also needs the increasing bandwidth of the guard station that is provided to them now, and ensures necessary service quality.In order to meet these needs, Virtual network operator is being set up the Optical Access Network with heterogeneous networks topology, such as FTTP, Fiber-To-The-Node, the Fiber-To-The-Building with multiple different access transfer scheme (comprising BPON, EPON, GPON, WDM-PON and active Ethernet).Become increasingly complex along with service provider's network becomes, for guaranteeing service-level agreement (SLA) and ensureing customer satisfaction, serve reliably and effective management of network has been become to key challenge for service provider.
Summary of the invention
According to a summary aspect, the present invention relates to a kind of integrated optical transceiver, it comprises: optical receiver, it generates first signal of telecommunication in response to the first light signal at reception electrical interface place; Optical transmitting set, it launches the second light signal in response to second signal of telecommunication receiving at transmitting electrical interface place; The first optical branch device, it receives the first light signal and at least a portion of the first light signal is directed to optical receiver at reception optical interface place; The second optical branch device, the second light signal is directed at utilizing emitted light interface by it.The first optical branch device can be directed at the second optical branch device by least a portion of the first light signal.The second optical branch device can be directed at utilizing emitted light interface by this part first light signal receiving from the first optical branch device.
According to another summary aspect, the present invention relates to a kind of optical communication system, it comprises the first optical transceiver module, described the first optical transceiver module comprises: power-fail monitor, and it is configured to detect closing on power-fail and produce alarm for power-off (dying gasp) signal while closing on power-fail when detecting in the first optical transceiver module in the first optical transceiver module; The first optical transmitting set, it is configured to comprise in the output of utilizing emitted light interface the first light signal of alarm for power-off signal.Described optical communication system also comprises the second optical transceiver module, described the second optical transceiver module comprises: the second receiver, and it is configured to received from first light signal that comprises alarm for power-off signal of the first optical transceiver and exported second signal of telecommunication in response to the first light signal by optical link; Alarm for power-off detector, it is configured to detect the alarm for power-off signal in the first light signal or second signal of telecommunication.
According to another summary aspect, the present invention relates to a kind of optical network system, it comprises multiple the first optical transceiver modules.Described the first optical transceiver module comprises: the first reflector, and it can export downlink optical signal with comprising the first downlink electrical signal of down user data in response to Corticofugal Modulation of Somatosensory control signal; The first receiver, it can receive uplink optical signal, wherein said uplink optical signal comprises uplink user data and the up modulation signal that is loaded with up management information, and wherein the first receiver can be exported first signal of telecommunication that comprises up modulation signal and the first uplink electrical signals that comprises uplink user data; The first processing unit, it can generate Corticofugal Modulation of Somatosensory control signal and demodulation first signal of telecommunication to extract up management information in response to down management information.Described optical network system also comprises the first wavelength filter.Described the first wavelength filter comprises: multiple the first branch port, each the first branch port is associated with first optical transceiver module, and be configured to receive from the downlink optical signal of the first reflector in its first associated optical transceiver module and to the first receiver in its first associated optical transceiver module and send uplink optical signal, wherein said each the first branch port is all associated with wavelength channel; The first public port, it can export the downlink optical signal receiving at arbitrary the first branch port place.Described optical network system also comprises multiple the second optical transceiver modules.Described the second optical transceiver module comprises: the second receiver, and it can receive downlink optical signal and export second signal of telecommunication, and wherein said second signal of telecommunication comprises Corticofugal Modulation of Somatosensory control signal and comprises the second downlink electrical signal of down user data; The second processing unit, its can demodulation second signal of telecommunication to extract down management information, and generate up modulator control signal in response to up management information; And second reflector, it can and comprise the second uplink electrical signals of uplink user data and launch uplink optical signal in response to up modulator control signal.Described optical network system also comprises second wave length filter, described second wave length filter comprises: multiple the second branch port, and each the second branch port is configured to receive from the uplink optical signal of second optical transceiver module and to this second optical transceiver module and sends downlink optical signal; The second public port, it can and receive the downlink optical signal from the first public port to the first public port output uplink optical signal.
According to another summary aspect, the present invention relates to a kind of optical communication method that utilizes optical transceiver.The method comprises: generate first signal of telecommunication by optical receiver at reception electrical interface place in response to the first light signal; Launch the second light signal in response to second signal of telecommunication receiving at transmitting electrical interface place by optical transmitting set; Receive the first light signal by the first optical branch device at reception optical interface place; By the first optical branch device, at least a portion of the first light signal is directed to optical receiver; By the second optical branch device, the second light signal is directed to utilizing emitted light interface; By the first optical branch device, at least a portion of the first light signal is directed to the second optical branch device; By the second optical branch device, this part first light signal receiving from the first optical branch device is directed to utilizing emitted light interface.
According to another summary aspect, the present invention relates to a kind of optical communication method.The method comprises: detect the power-fail that closes in the first optical transceiver module by power-fail monitor; Produce alarm for power-off signal when detecting while closing on power-fail by power-fail monitor in the first optical transceiver module; Comprise the first light signal of alarm for power-off signal in the output of utilizing emitted light interface; Receive the first light signal that comprises alarm for power-off signal from the first optical transceiver by the second receiver in the second optical transceiver module; Export second signal of telecommunication in response to the first light signal; Detect the alarm for power-off signal in the first light signal or second signal of telecommunication by alarm for power-off detector.
The execution mode of described system can comprise one or more in following.The first optical branch device and the second optical branch device can comprise optical splitter, optical switch or adjustable optical attenuator.Receive electrical interface and launch electrical interface and meet the industry standard including SFF, SFP, XFP and SFP+.Receive electrical interface and launch electrical interface and can be inserted into mainframe network equipment.Integrated optical transceiver also can further comprise power-fail monitor, described power-fail monitor is configured to detect power-fail in integrated optical transceiver and produces alarm for power-off signal when detecting while closing on power-fail in integrated optical transceiver module, and wherein said optical transmitting set is configured to export the second light signal in response to alarm for power-off signal at least in part.Can carry alarm for power-off signal by the envelope modulation in the second light signal or on/off switch.
The embodiment of the present invention may comprise one or more following advantages.By means of the directly monitoring reliably to optical communication obtaining by setting up photosphere communication port (its not interference user data communication), disclosed system and method can provide communication more reliably.Disclosed system and method can be eliminated the demand to boundary equipment in some conventional optical network system.By being integrated in the function that comprises non-interfering type photosphere communication port, photosphere management and data feedback ability in optical transceiver, the function of optical transceiver is strengthened.In traditional optical transceiver, these functions are disabled.
In addition, increase expense photosphere management is provided at the main process equipment not inserting to user data and optical transceiver disclosed by the invention.Disclosed system and method does not need expensive device (such as digital wrapper or extra cooperative device) at customer rs premise.And disclosed optical transceiver meets the optical transceiver form of industry standard.Disclosed optical transceiver can be implemented as the device of the main process equipment reception electrical power of inserting from it.Disclosed optical transceiver is applicable to multichannel light communication network, such as the optical-fiber network between optical terminus, remote node and optical network unit.
In addition, disclosed system and method provides the ring of light to return, and except data loop fuction or in the time that data loop fuction is unavailable, the described ring of light returns the remote testing that allows optical link.The ring of light returns and can in optical transceiver device, be implemented and work during power-fail." alarm for power-off " monitors, report and detect by responding more fast photosphere and communicate by letter and provide.
Although specifically illustrate and described the present invention with reference to multiple embodiment, those skilled in the relevant art should be understood that, can carry out the change in various forms and details to it, and without departing from the spirit and scope of the present invention.
Brief description of the drawings
Fig. 1 is the block diagram that comprises the optical network system of a pair of transceiver on point-to-point optical fiber link.
Fig. 2 is the block diagram that comprises the optical network system of intelligent optical transceiver.
Fig. 3 illustrates the exemplary optical network system with insertable intelligent optical transceiver.
Fig. 4 is the example block diagram with the intelligent optical transceiver of integrated photosphere managerial ability.
Fig. 5 is the example block diagram with the intelligent optical transceiver of integrated photosphere managerial ability and data loop fuction.
Fig. 6 A is the example block diagram with the intelligent optical transceiver of integrated photosphere managerial ability and light loop fuction.
Fig. 6 B and 6C illustrate the exemplary optical branch apparatus that is applicable to intelligent optical transceiver in Fig. 6 A.
Fig. 7 illustrates the illustrative embodiments that monitors " alarm for power-off " in optical network system at photosphere.
Fig. 8 has integrated photosphere managerial ability and returns and the example block diagram of the intelligent optical transceiver of other diagnostic functions such as alarm for power-off such as teledata loopback, the ring of light.
Fig. 9 illustrates the multichannel light network system that comprises the intelligent optical transceiver with photosphere managerial ability.
Embodiment
With reference to figure 1, optical network system 100 comprises the network equipment 101 and 102 that is installed in diverse location, and they can communicate with light signal by optical link 103.Optical link 103 can comprise for example single optical fiber or comprise the optical cable of a branch of optical fiber.The network equipment 101 comprises optical transceiver 110, data processing unit 114 and administration module 112, optical transceiver 110 is configured to carry out the conversion between light signal and the signal of telecommunication, data processing unit 114 can process communication signals, the function of the administration module 112 monitoring and controlling network equipments 101.Equally, the network equipment 102 comprises optical transceiver 120, data processing unit 124 and administration module 122, optical transceiver 120 can be carried out the conversion between light signal and the signal of telecommunication, and data processing unit 124 can process communication signals, the function of the administration module 122 monitoring and controlling network equipments 102.Alternatively, upper layer network management system 105 is managed whole network system 100.
For instance, optical network system 100 can be the network of telecommunications service or ISP.The network equipment 101 can be positioned at service provider's central apparatus place, and is managed by network management system 105 by administration module 112.Interface 106 between network management system 105 and administration module 112 can comprise for example interface of RS232 control desk, ethernet port and other types.The network equipment 102 can be positioned at the remote location such as customer rs premise.Network management system 105 can only remotely be managed remote equipment 102 in local management equipment 101.In certain embodiments, upper at down direction (from central office to customer rs premise), management information can be sent to administration module 112 from network management system 105 by interface 106, is then sent to data processing unit 114 by communication interface 118.Data processing unit 114 is processed down management information, then sends to optical transceiver 110 signal of telecommunication that not only comprises user data but also comprise down management information.
In this manual, term " user data " refers to the data that are loaded with the information being passed between for example service provider and client.For example, " user data " can be included in the video data, speech data and the e-mail data that between the difference in optical communication network, transmit.Compare with " user data ", " management data " is only used for guaranteeing the true(-)running of optical-fiber network by equipment.
Administration module 112 also can by communication interface 116 directly and optical transceiver 110 communicate.Downlink electrical signal is converted to downlink optical signal by optical transceiver 110.Optical transceiver 120 receives downlink optical signal via optical link 103, and downlink optical signal is converted back to downlink electrical signal.Data processing unit 124 extracts down management information from the downlink electrical signal from optical transceiver 120, and sends down management information by communication interface 128 to administration module 122.On up direction, up management information adopts from administration module 122 by the contrary path of the Zhongdao network management system 105 of data processing unit 124, optical transceiver 120, optical transceiver 110, data processing unit 114 and administration module 112.
In above-mentioned layout, the bandwidth of the optical link 103 between management data and user data shared network equipment 101 and the network equipment 102.The communication mode of this management data is known as " in band " tunneling traffic." band in " management can be embodied as to the dedicated management expense in Frame, such as Ethernet OAM (operation management maintenance), or be embodied as the digital wrapper of encapsulated user data.In a rear situation, the data rate of the optical link 103 forming is higher than user data rate." in band " passage has some shortcomings.First,, the in the situation that of having dedicated management expense in Frame, because bandwidth is assigned to management data, therefore the bandwidth of user data has reduced.The in the situation that of digital wrapper, the data processing chip of complex and expensive must be added in system.Secondly, the network equipment 101 and the network equipment 102 must interconnect completely.But, interconnection and interflow between the network equipment 101 and 102 might not always exist, because they conventionally have different manufacture periods and different grade (carrier-class is to enterprise-level), for example, had by different mechanism (service provider and client) and operate, safeguard (carrier-class is to enterprise-level) by different programs.In order to ensure to interconnect, industry is installed and is belonged to the extra interconnecting and interworking equipment that service provider is all and safeguarded by it at customer rs premise.This way all will be paid very large cost in equipment cost and operation complexity.
With reference to figure 2, in certain embodiments, optical communication system 200 comprises the network equipment 201 and 202 that is installed in diverse location, and they connect by optical link 203.The network equipment 201 comprises intelligent optical transceiver 210, data processing unit 214 and administration module 212, and data processing unit 214 is processed communication data, the administration module 212 monitoring and controlling network equipments 201.Equally, the network equipment 202 comprises intelligent optical transceiver 220, data processing unit 224 and administration module 222, and data processing unit 224 is processed communication data, the administration module 222 monitoring and controlling network equipments 202.
Optical transceiver 210 and 220 comprises respectively modulator-demodulator 211 and 221.Modulator-demodulator 211 and 221 is configured to apply non-interfering type modulation and this modulation is recovered to the descending and upstream data. signals between optical transceiver 210 and 220.Modulator-demodulator 211 and 221 is the processing units that can carry out modulation and demodulation function.Modulation and demodulation function can be embodied as to integrated circuit, or be embodied as the software application that is stored as firmware on memory.Processing unit can comprise one or more processing unit.
In this manual, " non-interfering type modulation " refer to the negligible modulation of impact on the user data between optical transceiver in optical communication system.For example, non-interfering type modulation can comprise the envelope modulation that the frequency that light data-signal is carried out is lower, amplitude is less.Here envelope refers to the track of the amplitude peak of light data-signal.Light data-signal can be as the carrier wave of secondary modulation, and described secondary modulation changes the amplitude of envelope more slowly compared with the bit rate of this carrier wave.Light signal with user data is compared, and the amplitude of envelope modulation can remain relatively little.Should be understood that, be only exemplary execution mode to the envelope modulation by a small margin of user data signal.Disclosed system and method can adopt other modulation and demodulation technology, such as but not limited to: frequency modulation(FM) and phase-modulation.
Early described " in band " communication means compares, and Integrated Light modulator-demodulator 211 and 221 is negligible on the impact of user data transmission on the modulation /demodulation of light signal.There is no to change packet and the data rate by the user data of optical link 203.In other words, optical modem 211 and 221 can be realized in the mode of non-interference " transparent " or " outside band " management in optical communication system 200.Link 204 between optical modem 211 and 221 is communication ports.In this manual, optical transceiver 210 and 220 can be called to intelligent optical transceiver, this is because they comprise the not available intelligent element of conventional transceiver.
Optical communication system 200 can be managed by network management unit 205.Down management information in optical communication system 200 is sent to administration module 212 from network management unit 205 by management interface 206.Management interface 206 can be RS232 control desk, ethernet port or other types interface.Down management information is sent to intelligent optical transceiver 210 by communication interface 216 subsequently, and communication interface 216 can be I
2c (between integrated circuit, inter-integrated circuit) interface.Optical modem 211 in intelligent optical transceiver is processed down management information.Optical modem 211 is applied to the downlink optical signal being generated by intelligent optical transceiver 210 non-interfering type that comprises management information subsequently and is modulated.Downlink optical signal is received by optical transceiver 220 after propagating by optical link 203.Optical modem 221 extracts down management information by demodulation downlink optical signal from downlink optical signal.Down management information is sent to administration module 222 by communication interface 226 subsequently.Equally, up management information can adopt the path through optical transceivers 220, optical transceiver 210 and the administration module 212 final opposite directions that arrive network management unit 205 from administration module 222.Thereby optical communication system 200 has the managerial ability of expansion, the managerial ability of this expansion is transparent and non-interfering type to user data.
Management data signal can be generated by administration module 212,222 and optical transceiver 210,220.For example, what optical transceiver 210,220 was can time-triggered report current transmits and receives luminous power, and they can be used to analyze descending and link-quality uplink optical fibers.Occur significantly when deteriorated when passing in time, warning information can be sent to network management unit 205.Except the state of monitor optical transceiver 210,220, other states of administration module 212,222 all right watch-dogs 201,202.For example, the running status of data processing unit 224 can be reported to network management unit 205 by non-interfering type management channels.
In certain embodiments, the up supervisory signal that network management unit 205 extracts in response to modulator-demodulator 211 and generate at least a portion down management signal.For example, in the time that equipment 202 powers on for the first time and is connected to equipment 201, administration module 222 can generate registration information, and sends it to modulator-demodulator 211 by link 204.The modulated demodulator 211 of described registration information extracts, and is sent to network management unit 205.Network management unit 205 produces and will return to the confirmation of administration module 222.
Optical communication system 200 provides the communication port for the management data of photosphere (or layer 1) in the case of the management data without in transmission and processing upper strata.Therefore optical communication system 200 and disclosed other system and method can provide " photosphere management ", in photosphere generation, processing and transfer management data.Photosphere management can not cause the variation of user data transmission.For example, the transmission rate of user data, data format and content (expense and the Payload) impact that sensitive layer management does not exist.
It is all that the network equipment of central office side and optical cable belong to service provider conventionally.It is all and managed by it that far-end network equipment belongs to client conventionally.In the time that two parts network equipment is had by different institutions and operate and " in band " administrative standard is had to different adaptedness, it is very difficult that network management and condition monitoring may become.Prior, the cost of network operation is high, and this is due to " fault is patrolled and examined " (Service Technicians who refers to carry necessary diagnostic tool, equipment and supplies is to scene or the assignment of customer rs premise, for location and deal with problems).When occurring when network failure, for service provider personnel, it is desirable to can by service provider's place alarm signal is provided or from its place accesses network management system with the localization of faults and failure cause.In other words, it is desirable to, service provider not only can monitor and diagnose the equipment in the place that is positioned at service provider, but also can monitor and diagnose the equipment that is positioned at customer rs premise.
In some cases, service provider can configure boundary equipment at customer rs premise and realize required telemanagement ability.Boundary equipment is a kind of network-termination device (NTE) that service provider has, and therefore it can communicate with the equipment with the ability that interconnects completely in service provider place.By boundary equipment, management data can be inserted in user data and by it and extract from user data.Although increased cost, boundary equipment can contribute to managing network, reduce operation expenditure and service implementation grade agreement (SLA).
Disclosed intelligent optical transceiver can be exempted the needs to this boundary equipment, thereby provides simplification, flexibility and low cost aspect can and safeguarding at the structure of optical communication network.In certain embodiments, with reference to figure 3, optical communication system 300 comprise be arranged in service provider place the network equipment 201, be inserted into the insertable intelligent optical transceiver 320 of the network equipment 302 that is positioned at far-end (such as customer rs premise).Pluggable optical transceiver 320 can communicate by electrical interface 322 and the network equipment 302.For example, the network equipment 302 can be the Ethernet switch of enterprise.Pluggable optical transceiver 320 can be SFP (SFP) optical transceiver, and described SFP optical transceiver comprises integrated modulator-demodulator as above, and can be inserted in the standard SFP slot on enterprise's Ethernet switch.In this case, the electrical interface of optical transceiver, optical interface, mechanical interface and control interface meet MSA (multi-source agreement) specification.Can make intelligent optical transceiver meet other industry standard and specification, for example GBIC, SFF, SFP, XFP, X2, XENPAK and SFP+.
The network equipment 201 comprises intelligent optical transceiver 210, data processing unit 214 and administration module 212, and data processing unit 214 is processed communication data, and administration module 212 carries out monitoring and controlling to the network equipment 201.Intelligent optical transceiver 210 carries out optical communication by optical link 203 and pluggable optical transceiver 320.Intelligent optical transceiver 210 comprises modulator-demodulator 211, can insert optical transceiver 320 and comprise modulator-demodulator 321.In certain embodiments, optical transceiver 210 can also be inserted into the network equipment that is arranged in central office.As mentioned above, can transmit the management to the network equipment 201 and the network equipment 302 by modulator-demodulator 211 and 321 via non-interfering type management channels 204.In certain embodiments, can carry out bearer management data by being loaded with the relative low speed of light signal of user data and envelope modulation by a small margin, and carry out recovery management data by this envelope modulation of demodulation.Intelligent optical transceiver 320 can be accessed and manage to network management unit 205.
Management data signal in optical communication system 300 can be generated by various communicators or parts, for example network management unit 205, administration module 212, intelligent optical transceiver 210 and pluggable optical transceiver 320.Equipment 302, i.e. the main frame of pluggable optical transceiver 320, can belong to different institutions all.As mentioned above, equipment 302 is without participating in photosphere management.Therefore, without the interconnection and interflow requiring between equipment 302 and the network equipment 201.Optical communication system 300 can provide photosphere OAM by low-cost high-efficiency beneficially, and without boundary equipment or with the ability that interconnects completely of the network equipment at customer rs premise place.
In certain embodiments, the standard compliant MSA specification of the machinery of pluggable optical transceiver 320, light and electrical interface 322, for example GBIC, SFP, XFP, X2, XENPAK and SFP+ etc.It makes in the situation that not changing equipment 302, to realize light regime.In certain embodiments, pluggable optical transceiver 320 can be the device without self power supply.Pluggable optical transceiver 320 can receive the power from the network equipment 302 at its standard pin electrical interface 322 places.
Fig. 4 illustrates the intelligent optical transceiver 400 with non-interfering type management channels ability, and it is compatible mutually with the intelligent optical transceiver 210,220 and 320 in optical communication system 200 and 300.Driver 403, as laser driver, receives the differential data signals TD+ and the TD-that are loaded with user data, for launching at transmitting electrical interface 421 places.Under the driving of driver 403, utilizing emitted light assembly (TOSA) 401 can be in utilizing emitted light interface 422 place's utilizing emitted light output signals.The receiving optical signals that receives optical interface 432 places can be received optical assembly (ROSA) 402 and converts the reception signal of telecommunication to and further amplified by post amplifier 404, thereby is receiving the electrical interface 431 output differential data signals RD+ of places and RD-.Micro controller unit (MCU) 410 can monitoring and controlling optical transceiver 400 operation.MCU 410 can be at interface 411 place's output states and other signals reception control signal.Processing unit 412 is integrated in optical transceiver 400, so that carry out non-interfering type photosphere supervisory communications with other far-end optical transceivers, as above in conjunction with as described in Fig. 2 and Fig. 3.In certain embodiments, processing unit 412 can be embodied as to the modulator-demodulator being integrated in optical transceiver 400.In certain embodiments, processing unit 412 and MCU 410 can be embodied as to the modulator-demodulator being integrated in optical transceiver 400.Processing unit 412 can also be embodied as to circuit, or all or part ofly be realized by the software being stored in computer storage, for example firmware.Processing unit 412 is connected very closely with MCU 410, so that management data is sent to MCU 410 rapidly, and for data processing.Processing unit 412 communicates with driver 403.Should be understood that, the reception signal that what driver received transmit and post amplifier is exported is not limited to differential signal.These two kinds of signals can also meet single-ended signal standard.
In transmission path, processing unit 412 can send the modulator control signal 418 that includes management information to driver 403.Conventionally, compared with the transmitting user data receiving in transmitting electrical interface 421 places, preferably low speed signal of modulator control signal 418, for example tens of kilobit per second, and the former can be greater than 1 gigabit per second.In certain embodiments, bias voltage or the electric current of modulator control signal 418 in can modulating driver 403, with in upper low speed, the envelope modulation by a small margin of generating of differential data signals (TD+ and TD-).In RX path, ROSA 402 can be in response to receiving optical signals to processing unit 412 transmitted signals 416.Low speed in receiving optical signals 416, modulation can bearer management data by a small margin.Conventionally, compared with reception user data output electrical signals from ROSA 402, signal 416 is for example tens of kilobits per second of low speed signal, and the former can be greater than 1 gigabit per second.For example, signal 416 can be the mirror image photo-signal producing at ROSA 402 places.Processing unit 412 can restituted signal 416 extract management data.Therefore, intelligent optical transceiver 400 has the ability of sending and receiving non-interfering type management data.The management data extracting can be processed by MCU 410, or is sent to the main process equipment of optical transceiver 400 by interface 411.For example, can use optical transceiver 400 to replace the optical transceiver 210 in optical communication system 200 or 300.Optical transceiver 400 can be located at the OLT (optical line terminal) that is positioned at service provider place.Management data can be sent out away by interface 216, and is managed module 212 and processes.In another example, optical transceiver 400 can be positioned at the remote location away from service provider place.Optical transceiver 400 can be the insertable transceiver that is connected to as shown in Figure 3 third party device.MCU 410 can serve as the center cell of processing and generating management data.
Should be understood that, disclosed optical transceiver can comprise the parts the above-mentioned parts in optical transceiver 400.For example, disclosed optical transceiver can comprise the functional module such as CDR (clock and data recovery), SerDes (serializer, deserializer) and other functional modules.In addition, driver 403 can be laser-driven chip or the external modulator that can modulate from the continuous wave light signal of TOSA 401.
Should be understood that, the functional block in optical transceiver 400 and parts can be discrete physical devices.Several functional blocks can be integrated into single device.For example, utilizing emitted light assembly 401 and reception optical assembly 402 can be integrated in bi-directional light assembly (BOSA), and wherein said bi-directional light assembly has the bi-directional light interface that can export utilizing emitted light signal 422 and receive receiving optical signals 432.
Data loopback test is for debugging and the useful means of fixer network failure mode to service provider.It can helping service provider be avoided unnecessary " fault is patrolled and examined " and reduce operating cost.Fig. 5 illustrate with optical communication system 200 and 300 in optical transceiver 210,220 and 320 compatible intelligent optical transceiver 500 mutually.Intelligent optical transceiver 500 comprises non-interfering type management channel, and it is similar to the non-interfering type management channel described in combined with intelligent optical transceiver 400 above.Intelligent optical transceiver 500 comprises integrated loopback controller 570, and integrated loopback controller 570 can receive differential data signals (TD+, TD-), for launching at transmitting electrical interface 421 places.Loopback controller 570 can be operated in the bypass situation of acquiescence, in bypass situation, directly be sent to driver 403 for the differential data signals (TD+, TD-) of launching, receive data (RD+, RD-) and also directly launched from post amplifier 404.
MCU 410 can be at interface 411 places to outside output status signal with receive from outside control signal (not shown in Fig. 5).MCU 410 can transmit control signal 590, so that loopback controller 570 is controlled as different loopback modes, comprises local loopback and remote loopback.Under local loopback pattern, be routed in loopback controller 570 inside and get back to reception electrical interface (along path 580) for the differential data (TD+, TD-) of launching.The normal operation of the network equipment that the signal that institute's route is returned can insert for checking intelligent optical transceiver 500.Under remote loopback pattern, the output of post amplifier 404 is got back to driver 403 (along path 585) by loopback controller 570.Driver 403 and TOSA 401 can generate the utilizing emitted light signal that the receiving optical signals to receiving optical interface 432 places receptions copies.The light signal copying under remote loopback pattern can make service provider remotely verify and come and go optical transceiver 500 and the operating state of optical transceiver 500 own.
In certain embodiments, above-mentioned intelligent optical transceiver, system and method can be able to further enhancing by light loop-back capability.With reference to the intelligent optical transceiver 600 in figure 6A, reflector 601 is configured to receive the transmitting signal of telecommunication and launch utilizing emitted light signal at transmitting electrical interface 621 places.Optical branch device 604 can output to utilizing emitted light signal utilizing emitted light interface 622.Optical branch device 603 is configured to receiving optical interface 632 places' reception receiving optical signals.Receiver 602 changes the receiving optical signals receiving from optical branch device 603 into the reception signal of telecommunication at reception electrical interface 631 places.The suitable execution mode of optical branch device 603 and 604 comprises optical splitter, optical switch, variable optical attenuator and other optical branch devices.Loop-back path 610 is configured to from optical branch device 603 to optical branch device 604.Under normal operating condition, loop-back path 610 be open circuit or decay very large.Compared with the utilizing emitted light signal of launching with reflector 601, the intensity of light loopback signal is little of ignoring.Under diagnostic mode, at least a portion receiving optical signals returns by light loop-back path 610: from optical branch device 603 to optical branch device 604, then arrive utilizing emitted light interface 622.Reflector 601 can be disabled or its light output is stopped by optical branch device 604.The receiving optical signals returning can be received by the optical device in diverse location, the integrality of the optical link being connected with intelligent optical transceiver 600 for remote testing.
Optical branch device 603 and 604 can be realized by Passive Optical Components.In the time that data loopback is unavailable (during power-fail), the ring of light returns the remote testing that allows optical link.Optical branch device 603 with 604 can with optical transceiver 600 in reflector 601 and receiver 602 mutually integrated and form overall optical assembly (OSA).Entirety OSA can meet different optical transceiver canonical form or specification, includes but not limited to: GBIC, SFP, XFP, X2, XENPAK and SFP+.Launch electrical interface 621 and receive electrical interface 631 thereby can insert in the mainframe network equipment based on these standard interfaces.Utilizing emitted light interface 622 with receive optical interface 632 and be configured to be connected with optical fiber, to allow and the optical communication of remote station.
Optical branch device 603 and 604 can be realized by optical splitter (being directional optical coupler).As shown in Figure 6B, optical splitter 650 comprises three ports: public port 651, optical branch port A652 and optical branch port B 653.The light signal receiving at public port 651 places can be conducted to branch port A 652 and branch port B 653 with specific splitting ratio.Otherwise, can be with corresponding combination than combining, to export at public port 651 places at the light signal of branch port A 652 and branch port B 653 places reception.Splitting ratio and combination are than changing along with the structure of optical splitter 650.Optical crosstalk between branch port A 652 and branch port B 653 can be minimized, so that branch port A 652 and branch port B 653 can be considered to isolation.Optical splitter 650 can be used as and not use the device of power supply and be implemented.When be applied in intelligent optical transceiver 600 optical branch device 603 time, public port 651 receives from receiving the receiving optical signals of optical interface 632.Branch port A 652 and branch port B 653 are connected to respectively receiver 602 and optical branch device 604.In the time being applied to optical branch device 604, public port 651 is connected to utilizing emitted light interface 622.Branch port A 652 and branch port B 653 are connected to respectively reflector 601 to receive utilizing emitted light signal and optical branch device 603 to receive receiving optical signals.For optical branch device 603 and 604, splitting ratio between branch port A 652 and branch port B 653 is designed to provide enough strong light loopback signal to detect for remote diagnosis, makes to be incorporated into utilizing emitted light signal under normal operating condition and the noise minimum of receiving optical signals simultaneously.
Fig. 6 C illustrates another embodiment of optical branch device 603 and 604.Optical switch 660 comprises public port 661, branch port A 662 and branch port B 663.Under the control of control signal 665, public port 661 can be switched to branch port A 662 or branch port B 663.An illustrative embodiments of optical switch 660 is 1 × 2 optical switches.In optical branch device 603 and 604, the execution mode of optical switch 660 is similar to the above description relevant to optical splitter 650.In addition, optical switch 660 can be to receive external power source and the active device of working.Once power-fail, described optical switch 660 can automatically restore to default conditions, to set up light loop-back path for remote testing.
It is one of modal fault in optical-fiber network that device power supply (DPS) lost efficacy.Power-fail often occurs in the equipment that is arranged in remote station." alarm for power-off " refers to a kind of ability of reporting power failure from remote station by optical-fiber network." alarm for power-off " can for example be undertaken by the Ethernet OAM in optical-fiber network (operation management maintenance).Traditional " alarm for power-off ", such as " alarm for power-off " that define in ieee specification, requires the interoperability losing efficacy between the equipment of end and the test side of light connection.In fact, this interoperability usually realizes by configure extra boundary equipment at remote station, so just needs extra equipment cost and cost of labor.
In certain embodiments, as shown in Figure 7, " alarm for power-off " function can be implemented by the photosphere between the intelligent optical transceiver 701 and 702 being connected by optical link 703.Intelligent optical transceiver 701 is positioned at service provider's guard station.Intelligent optical transceiver 702 is positioned at remote station (such as customer rs premise).Optical transceiver 701 comprises receiver 710, post amplifier 711 and alarm for power-off detector 713.Optical transceiver 702 comprises reflector 720, driver 721 and power-fail monitor 723.
In the time being about to power-fail occurs at far-end optical transceiver 702 places, power-fail monitor 723 can detect this problem.Before power supply drops to the threshold level lower than the normal operation of optical transceiver 702, power-fail monitor 723 sends signal to driver 721, and this signal driver reflector 720 sends predefined alarm for power-off signal 705 by optical link 703.Receiver 710 in optical transceiver 701 obtains predefined alarm for power-off signal 705 the output packet mirror image photoelectric current 715 containing alarm for power-off signal 705.Predefined alarm for power-off signal 705 can be realized by light envelope modulation, light output on/off switch and other modulation schemes.Intelligent optical transceiver 701 may further include and is configured to the demodulation signal of telecommunication to extract the processing unit of alarm for power-off signal.Alarm for power-off detector 713 detects " alarm for power-off " event in mirror image photoelectric current 715.Alternatively, post amplifier 711 receives the signal of telecommunication and sends dropout (LOS) 716 to alarm for power-off detector 713 from receiver 710, and wherein " alarm for power-off " event is detected.Alarm for power-off detector 713 can be realized by circuit or the software (as firmware) being stored in computer storage.The detection of above-mentioned " alarm for power-off " can be implemented in photosphere, and described photosphere is independent of the form of customer data in layer 2 and transmitting and RX path.
Fig. 8 illustrates the exemplary detailed diagram of intelligent optical transceiver 800.Optical transceiver 800 can be implemented as insertable transceiver, and it has the lower widely accepted form of multi-source agreement (MSA) in optical-fiber network industry.For example, optical transceiver 800 can meet GBIC, SFP, XFP, X2, XENPAK and SFP+.
Optical transceiver 800 can comprise and is configured to provide as the previous optical branch device 830 and 831 to optical transceiver 600 described smooth loop fuctions.The overwhelming majority of input optical signal is coupled to ROSA 801 by optical branch device 830.The overwhelming majority of the power output of optical branch device 831 is from TOSA 811.In the time realizing with optical splitter, optical branch device have different splitting ratios and in conjunction with than.For example, optical branch device 830 and 831 can have respectively 10% splitting ratio and in conjunction with than, thereby cause 1% of input optical power to return and be fed back by the ring of light.MCU 820 can process and control telecommunication management, and transmits communications status and control signal (TxDisable, TxFault, LOS etc.) to outside at I2C interface.
On data receiver path, be converted to differential electric signal by the input optical signal of optical branch device 830 by ROSA801.Then this differential electric signal amplifier 803 that is further limited amplifies and is sent to fan out buffer 823, fan out buffer 823 can export data RD+/-.Fan out buffer 823 is also to data loop-back path output data.
On data transmission path, the differential data signals TD+ of input/-received by 2 × 1MUX 824.2 × 1MUX 824 under the control of the SEL signal from MCU 820 by TD+/-signal or send to driver 812 from the looping back data of fan out buffer 823.Therefore, driver 812 drives TOSA 811 transmittings can comprise the utilizing emitted light signal of user data or looping back data.Driver 812 is enabled from the enable signal of MCU 820.The output of optical branch device 831 comprises from the signal of TOSA 811 with from the combination of the light loopback signal of optical branch device 830.
Management data is transmitted in different paths.ROSA 801 output packets contain mirror image photoelectric current received, that be carried on the management data in receiving optical signals.AFE (AFE (analog front end)) 802 is converted to this mirror image photoelectric current the voltage signal of amplification to be input to modulator-demodulator 821, and wherein said modulator-demodulator 821 is embedded in MCU 820.In order to be operated under the broad power band of receiving optical signals, AFE 802 can automatically adjust multiplication factor under the control of modulator-demodulator 821.Modulator-demodulator 821 can be implemented by firmware or software, to utilize the hardware resource of MCU820.The signal that modulator-demodulator 821 can datumization receives, carrys out extract management data and applies envelope modulation to output optical signal based on predefined algorithm.In one embodiment, pass to driver 812 to produce the variation of bias current through the offset signal of ovennodulation from MCU 820, this variation can produce modulation to the amplitude of the output optical signal by optical branch device 831 then.
Still with reference to Fig. 8, as long as power Vcc drops to below predetermined threshold value, power-fail monitor 822 just can generate event signal in real time.Under the triggering of this event signal, MCU820 sends " alarm for power-off " with predefined command mode immediately.Can by modulation bias current or by enable control signal EN simply Q-swith laser Q send " alarm for power-off ".Before power supply is down to the inoperable point of optical transceiver 800, " alarm for power-off " must be sent in time.For example, if Vcc is approximately 3.3 volts, can be by power monitoring Threshold at 3.0 volts.The minimum of optical transceiver 800 is 2.5 volts.The process that " alarm for power-off " signals should be after Vcc be down to below 3.0 volts but be completed before it reaches 2.5 volts.
Generally speaking, above-described " alarm for power-off " monitors, report and detecting is implemented in photosphere, more directly simple and have faster and respond compared with its " alarm for power-off " system traditional with some.
In certain embodiments, the above disclosed system and method about photosphere management and intelligent optical transceiver (in Fig. 1 to Fig. 8) can be embodied in multichannel light network.With reference to Fig. 9, optical network system 900 comprises wavelength filter 911 in optical line terminal (OLT) 901 and the wavelength filter 912 at distant-end node 903 places.The example of wavelength filter 911 and wavelength filter 912 comprises wavelength division multiplexing (WDM) filter (it can be realized by for example array waveguide grating AWG), film DWDM (dense wave division multipurpose) filter and film CWDM (Coarse Wavelength Division Multiplexing) filter.
Wavelength filter 911 and 912 all comprises one or more public ports.The public port of wavelength filter 911 and 912 is coupled together by optical link 902, and wherein said optical link 902 can be formed by simple optical fiber or the optical cable that comprises a branch of optical fiber.Wavelength filter 911 and 912 also comprises the branch port of multiple symmetries, the port of above-mentioned symmetry respectively different wavelength channel " Ch1 ", " Ch2 " ..., communicate in " ChN ".The branch port of the wavelength filter 911 at OLT 901 places be connected to multiple intelligent optical transceiver 910_1,910_2 ..., 910_N.Intelligent optical transceiver 910_1,910_2 ..., 910_N comprise respectively modulator-demodulator 911_1,911_2 ..., 911_N, wherein said modulator-demodulator 911_1,911_2 ..., 911_N can be integrated in optical transceiver associated with it.Intelligent optical transceiver 910_1,910_2 ..., 910_N can be inserted into the network equipment that is arranged in OLT 901 places.OLT901 also comprise with intelligent optical transceiver 910_1,910_2 ..., the network management unit 914 that communicates of 910_N.Similarly, the branch port of the wavelength filter 912 at distant-end node place be connected to lay respectively at different optical network unit (ONU) 904_1,904_2 ..., multiple intelligent optical transceiver 920_1, the 920_2 at 904_N place ..., 920_N.ONU 904_1,904_2 ..., 904_N is typically distributed on different location.Intelligent optical transceiver 920_1,920_2 ..., 920_N can be inserted into be positioned at different ONU 904_1,904_2 ..., in the network equipment of 904_N.Intelligent optical transceiver 920_1,920_2 ..., 920_N comprise respectively modulator-demodulator 921_1,921_2 ..., 921_N, wherein said modulator-demodulator 921_1,921_2 ..., 921_N can be integrated in optical transceiver associated with it.
Optical network system 900 (for example, between OLT and multiple ONU) between single-point and multiple spot can be provided with communicating by letter in different communication passage.Communication port can be special and be independent of other passages between 2 o'clock.For example, communicating by letter between the intelligent optical transceiver 910_1 in the OLT 901 in passage 1 (i.e. " Ch1 ") and the intelligent optical transceiver 920_1 in ONU 904_1 is that special branch port by wavelength filter 911 and 912 is carried out.
Similar with above description, in optical network system 900, can set up non-interfering type management channels at photosphere.This non-interfering type management channels can be based upon intelligent optical transceiver 910_1,910_2 ..., 910_N and 920_1,920_2 ..., corresponding intelligent optical transceiver in 920_N between each wavelength channel on.For example, the dotted line of locating as wavelength channel " Ch1 " indicated, the non-interfering type management channels on wavelength channel Ch1 can be based upon between the modulator-demodulator 921_1 in modulator-demodulator 911_1 and the optical transceiver 920_1 in optical transceiver 910_1.Be similar to communicating by letter between administration module 212 in optical communication system 200 and 300 and modulator-demodulator 211, network management unit 914 by intelligent optical transceiver 910_1 all in communication interface and OLT 901 ..., 910_N communicates.Intelligent optical transceiver 910_1 in network management unit 914 and OLT901 ..., example communication interface between 910_N is I2C serial communication bus.By non-interfering type management channels, network management unit 914 can also access far-end ONU 904_1 ..., the intelligent optical transceiver 920_1 at 904_N place ..., 920_N.For example, network management unit 914 can send to smart transceiver 910_1 down management data.Modulator-demodulator 911_1 in transceiver 910_1 can send to the modulator-demodulator 921_1 in smart transceiver 920_1 down management data.Similarly, can up management data be sent to network management unit 914 from modulator-demodulator 921_1 by modulator-demodulator 911_1.Therefore comprise the OLT 901 at central office place and the ONU904_1 at remote location place ..., the optical network system 900 of 904_N can be managed by the network management unit 914 at OLT 901 places in the situation that not knowing format of user data or transferring content.
It should be noted, optical network system 900 only for example understands a point-to-multipoint optical network system.Current invention also meets the optical network system of point-to-point.In the optical network system of this point-to-point, wavelength filter 912 and intelligent optical transceiver 920_1 ..., 920_N can colocated and be integrated in a system that is similar to OLT 901.The WDM transmission system that an example of this system is point-to-point.
Should be understood that, above-mentioned concrete configuration and parameter mean the explanation to concept of the present invention.Disclosed system and method can comprise the change that described configuration and parameter are carried out, and does not depart from spirit of the present invention.For example, should be understood that, is only a kind of illustrative embodiments to the envelope modulation by a small margin of user data signal.Disclosed system and method can adopt other modulation and demodulation technology, such as but not limited to: frequency modulation(FM) and phase-modulation.Disclosed optical transceiver, optical communication network and optical communication system can comprise other part or have and above-mentioned different structure.Disclosed optical transceiver can meet other standards unlisted in above description.Disclosed system and method can be applicable to active and passive device, and point-to-point or point-to-multi-point optical network.
Claims (15)
1. an optical communication system, is characterized in that, comprising:
The first optical transceiver module, comprising:
Power-fail monitor, is configured to detect closing on power-fail and produce alarm for power-off signal while closing on power-fail when detecting in the first optical transceiver module in the first optical transceiver module;
With the first reflector that power-fail monitor communicates, described the first reflector is configured to comprise in the output of utilizing emitted light interface the first light signal of alarm for power-off signal; And
The second optical transceiver module, comprising:
The second receiver, is configured to received from first light signal that comprises alarm for power-off signal of the first optical transceiver module and exported second signal of telecommunication in response to the first light signal by optical link; And
Alarm for power-off detector, is configured to detect the alarm for power-off signal in the first light signal or second signal of telecommunication.
2. optical communication system according to claim 1, is characterized in that, described the first optical transceiver module further comprises driver, and described driver is configured to drive the first reflector in response to the alarm for power-off signal receiving from power-fail monitor.
3. optical communication system according to claim 1, it is characterized in that, described the second optical transceiver module further comprises amplifier, and described amplifier is configured to amplify from the signal of telecommunication of the second receiver and to alarm for power-off detector transmitted signal lossing signal.
4. optical communication system according to claim 1, is characterized in that, described alarm for power-off signal carries by the envelope modulation in the first light signal or on/off switch.
5. optical communication system according to claim 4, is characterized in that, described the second optical transceiver module further comprises processing unit, and described processing unit is configured to demodulation second signal of telecommunication to extract alarm for power-off signal.
6. optical communication system according to claim 1, is characterized in that, wherein said the second optical transceiver module further comprises the second optical transmitting set that is configured to launch the second light signal, and wherein said the first optical transceiver module further comprises:
The first optical receiver, is configured to generate second signal of telecommunication in response to the second light signal;
The first optical branch device, is configured at least a portion of the second light signal to be directed at the first optical receiver; And
The second optical branch device, be configured to the first light signal to be directed at utilizing emitted light interface, wherein the first optical branch device is configured at least a portion of the second light signal to be directed at the second optical branch device, and wherein the second optical branch device is configured to this part second light signal receiving from the first optical branch device to be directed at utilizing emitted light interface.
7. an optical network system, is characterized in that, comprising:
Multiple the first optical transceiver modules, each the first optical transceiver module comprises:
The first reflector, is configured to export downlink optical signal in response to Corticofugal Modulation of Somatosensory control signal with comprising the first downlink electrical signal of down user data;
The first receiver, be configured to receive uplink optical signal, wherein said uplink optical signal comprises uplink user data and the up modulation signal that is loaded with up management information, and wherein the first receiver is configured to the first uplink electrical signals that output comprises first signal of telecommunication of up modulation signal and comprises uplink user data; And
The first processing unit, is configured to generate Corticofugal Modulation of Somatosensory control signal and be configured to demodulation first signal of telecommunication to extract up management information in response to down management information;
The first wavelength filter, comprising:
Multiple the first branch port, each the first branch port is associated with first optical transceiver module, and be configured to receive from the downlink optical signal of the first reflector in its first associated optical transceiver module and to the first receiver in its first associated optical transceiver module and send uplink optical signal, wherein said each the first branch port is all associated with wavelength channel; And
The first public port, is configured to the downlink optical signal that output receives at arbitrary the first branch port place;
Multiple the second optical transceiver modules, each the second optical transceiver module comprises:
The second receiver, is configured to receive downlink optical signal and exports second signal of telecommunication, and wherein said second signal of telecommunication comprises Corticofugal Modulation of Somatosensory control signal and comprises the second downlink electrical signal of down user data;
The second processing unit, is configured to demodulation second signal of telecommunication to extract down management information, and generates up modulator control signal in response to up management information; And
The second reflector, is configured to launch uplink optical signal in response to up modulator control signal with comprising the second uplink electrical signals of uplink user data; And second wave length filter, comprising:
Multiple the second branch port, each the second branch port is configured to receive from the uplink optical signal of second optical transceiver module and to this second optical transceiver module and sends downlink optical signal; And
The second public port, is configured to the first public port output uplink optical signal and receives the downlink optical signal from the first public port.
8. optical network system according to claim 7, it is characterized in that, further comprise network management unit, described network management unit is configured to receive up management information and generate at least a portion of down management information in response to up management information from the first processing unit.
9. optical network system according to claim 7, is characterized in that, described the first optical transceiver module can be inserted in the first main process equipment and be configured to and receive down user data from the first main process equipment.
10. optical network system according to claim 7, is characterized in that, described the second optical transceiver module can be inserted in the second main process equipment and be configured to and receive uplink user data from the second main process equipment.
11. optical network systems according to claim 7, it is characterized in that, described the second optical transceiver module further comprises power-fail monitor, described power-fail monitor is configured to detect closing on power-fail and such producing alarm for power-off signal while closing on power-fail detecting in the second optical transceiver module, and wherein said the second processing unit is configured to generate up modulator control signal in response to alarm for power-off signal.
12. optical network systems according to claim 11, it is characterized in that, described alarm for power-off signal carries by the on/off switch of the envelope modulation in uplink optical signal or light, and wherein said the first processing unit is configured to extract alarm for power-off signal from uplink optical signal.
13. optical network systems according to claim 7, it is characterized in that, at least one in described the second optical transceiver module further comprises loopback controller, to send the second downlink electrical signal to receiving electrical interface or the second reflector under the control in the first control signal, wherein said the second reflector is configured to launch uplink optical signal in response to the second downlink electrical signal being sent by loopback controller.
14. optical network systems according to claim 13, it is characterized in that, described loopback controller is configured to receive the second uplink electrical signals at transmitting electrical interface place, and at least a portion that is configured under the control of the second control signal the second uplink electrical signals of the electrical interface of spontaneous emission is in the future routed to reception electrical interface.
15. 1 kinds of optical communication methods, is characterized in that, comprising:
Detect the power-fail that closes in the first optical transceiver module by power-fail monitor;
Produce alarm for power-off signal when detecting while closing on power-fail by power-fail monitor in the first optical transceiver module;
Comprise the first light signal of alarm for power-off signal in the output of utilizing emitted light interface;
Receive the first light signal that comprises alarm for power-off signal from the first optical transceiver module by the second receiver in the second optical transceiver module;
Export second signal of telecommunication in response to the first light signal; And
Detect the alarm for power-off signal in the first light signal or second signal of telecommunication by alarm for power-off detector.
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