CN101394231B - Burst type ultralong distance optical fiber protectors based on SOA optical switch - Google Patents
Burst type ultralong distance optical fiber protectors based on SOA optical switch Download PDFInfo
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- CN101394231B CN101394231B CN200810197527A CN200810197527A CN101394231B CN 101394231 B CN101394231 B CN 101394231B CN 200810197527 A CN200810197527 A CN 200810197527A CN 200810197527 A CN200810197527 A CN 200810197527A CN 101394231 B CN101394231 B CN 101394231B
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Abstract
The invention provides a burst-type super-long distance optical fiber protector based on an SOA optical switch, which comprises an optical line terminal interface, an optical splitter, the SOA optical switch and a main fiber interface which are connected in sequence, wherein the optical splitter is connected with a light detector and a control logic circuit in sequence; and the control logic circuit is further connected with the SOA optical switch. The optical fiber protector is compatible with all PON systems, enlarges the transmission distance and the branching ratio of the PON systems, and realizes the automatic optical fiber protection switching of a PON network.
Description
Technical field
The present invention relates to the Technology of Light Access Network field, particularly relate to a kind of be used to realize the trunk optical fiber redundancy protecting of EPON and the light path equipment that increases its transmission range and branching ratio.
Background technology
Ethernet passive optical network (EPON)/gigabit passive optical network (GPON) is progressively ripe and used rapidly as EPON (PON) technology of a new generation in recent years, and the PON technology has become the mainstream technology of optical access network.EPON is the access that realizes integrated service on the optical-fiber network topology of multiple spot putting.Generally, the PON system is by optical line terminal (0LT) and optical network unit (ONU), and the passive optical distribution network between OLT and ONU (ODN) constitutes.
The line speed of EPON/GPON all is the gigabit level, and the EPON/GPON technology of 10Gbps also develops, and the bandwidth resources that can supply utilize improve greatly, but this makes operator increase considerably the income bandwidth that the PON technological investment obtains.But cost benefit factor, network reliability etc. remain the big obstacle in the PON application.
On the one hand, the maximum transmission distance of PON technical stipulation is 20km, and the maximum branch ratio is 1: 32 (EPON) or 1: 64 (GPON), and this is difficult to meet the demands in the popularization of private network market and rural area.Consider the cost benefit factor, be necessary to invent a kind of light path equipment and amplify optical path signal, the coverage of expansion PON.On the other hand, be the tree topology of point because PON adopts to multiple spot, be connected a plurality of ONU equipment of far-end between OLT and the ODN through an optical fiber, in case the trunk optical fiber fault, all ONU will lose communication capacity.In order to improve network reliability and survivability; In the specification requirement of China Telecom (CTC) to PON equipment; Protected modes such as trunk optical fiber redundancy protecting, OLT PON mouth redundancy protecting, full guard have been stipulated; If but there is not the design protection function when OLT and ONU equipment development, then must could realize through additional equipment.
And traditional fibre circuit protector can only can't be used in the PON network the optical fiber link protection of transmission continuous wave signal; And also can't realize the amplification of optical path signal based on the fibre circuit protector of art designs such as micro electronmechanical (MEMS) optical switch, waveguide optical switch, can't improve the coverage of PON.
Summary of the invention
Technical problem to be solved by this invention is: a kind of burst type ultralong distance fiber optic protection device based on the SOA optical switch is provided.These compatible all PON systems of fiber optic protection device ability, transmission range and the branching ratio of expansion PON can realize that the automatic optical fiber protection of PON network is switched.
The technical scheme that the present invention adopted is: the present invention includes optical line terminal interface, optical branching device, SOA optical switch, trunk optical fiber interface, they join in order.Optical branching device also links to each other with photo-detector, control logic circuit successively.Control logic circuit also links to each other with the SOA optical switch.Optical branching device comprises descending optical branching device and up optical branching device.
The SOA optical switch comprises main with SOA optical switch and subsequent use SOA optical switch, and the trunk optical fiber interface comprises main with optical interface and subsequent use optical interface, and photo-detector comprises main with photo-detector and subsequent use photo-detector; The master is connected to main with optical interface and the main photo-detector of using respectively with SOA optical switch two ends; Subsequent use SOA optical switch two ends are connected to subsequent use optical interface and subsequent use photo-detector respectively; The optical line terminal interface links to each other with optical branching device through first wavelength division multiplexer, and the master links to each other with optical interface with main through second wavelength division multiplexer with the SOA optical switch, and subsequent use SOA optical switch links to each other with subsequent use optical interface through the 3rd wavelength division multiplexer.
Descending optical branching device comprises the first one-to-two optical branching device, and its two outputs are connected to main descending input port with SOA optical switch and subsequent use SOA optical switch respectively; Up optical branching device comprises two-in-one optical branching device, the second one-to-two optical branching device and the 3rd one-to-two optical branching device; The input of the second one-to-two optical branching device is connected to main up output with the SOA optical switch, and two outputs of the second one-to-two optical branching device are connected to an input of two-in-one optical branching device respectively and use photo-detector with the master; The input of the 3rd one-to-two optical branching device is connected to the up output of subsequent use SOA optical switch, and two outputs of the 3rd one-to-two optical branching device are connected to another input and the subsequent use photo-detector of two-in-one optical branching device respectively.
Advantage of the present invention: the present invention utilizes semiconductor optical amplifier (SOA) to protocol transparent; Amplify wavelength and cover S, C, L-band; Characteristics such as the switching speed of nanosecond; The fibre circuit protector of the PON system that is applicable to burst mode of design not only can realize not having the redundancy of Insertion Loss, the transmission range that can also prolong PON greatly.Now the integrated level of photonic device improves with reliability greatly, and monolithic photonic integrated circuit (PIC) can integrated multipath SOA and Passive Optical Components, and employing PIC designs can both meet the demands from cost and reliability aspect.The burst type ultralong distance fiber optic protection device of the present invention's design; The PON system of compliant with various protocols; Support that just at developing 10Gbps EPON/GPON maximum transmission range and 128 tunnel branching ratios of supporting 50km support the automatic optical fiber protection to switch; Maximum protection switching time＜3ms can improve the reliability and the cost advantage of PON network greatly.The present invention provides a kind of protocol transparent for the PON system; Safe and reliable, fault recovery is fibre circuit protection solution fast, when PON trunk optical fiber line broken circuit or loss become big; Can automatically accomplish fibre circuit in the short time at the utmost point and switch, thereby improve the stability of PON system greatly.The present invention safeguards very simple, can good investment yield be provided for the developer.Present device provides a PON interface and two trunk optical fiber interfaces, supports 1+1,1:1 trunk optical fiber redundancy protecting, supports automatic optical fiber protection Switch mode.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Fig. 2 is a device connection layout of the present invention.
Fig. 3 is an optical detection part signal view of the present invention.
Fig. 4 is an optical detection partial circuit sketch map of the present invention.
Fig. 5 is a control logic circuit sketch map of the present invention.
Fig. 6 is the drive circuit sketch map of SOA optical switch of the present invention.
Fig. 7 is the temperature control circuit sketch map of SOA optical switch of the present invention.
Embodiment
The present invention is between the OLT and ODN of PON system.As shown in Figure 1, the present invention includes optical line terminal interface, optical branching device, SOA optical switch, trunk optical fiber interface, they join in order.Optical branching device also links to each other with photo-detector, control logic circuit successively.Control logic circuit also links to each other with the SOA optical switch.
Device connection layout of the present invention is as shown in Figure 2.The optical line terminal interface of external OLT can be the SC/PC type.SC is the rectangle embedded plastic housing joint of Japanese ntt company exploitation, and PC representes return loss value >=40db.The trunk optical fiber interface comprises the master with optical interface and subsequent use optical interface, and interface type is SC/APC, and APC representes return loss value >=60db.The trunk optical fiber interface is through the ODN network connection user side ONU equipment of two trunk optical fibers with 2:N, and N is a natural number.
Photo-detector comprises main with photo-detector PD1 and subsequent use photo-detector PD2.SOA (semiconductor optical amplifier) optical switch comprises main with SOA optical switch SOA1 and subsequent use SOA optical switch SOA2.The optical line terminal interface links to each other with optical branching device through the first wavelength division multiplexer WDM1, and the master links to each other with optical interface with main through the second wavelength division multiplexer WDM2 with the SOA optical switch, and subsequent use SOA optical switch links to each other with subsequent use optical interface through the 3rd wavelength division multiplexer WDM3.The master is connected to main with optical interface and the main photo-detector PD1 that uses respectively with SOA optical switch SOA1 two ends; Subsequent use SOA optical switch SOA2 two ends are connected to subsequent use optical interface and subsequent use photo-detector PD2 respectively.
The SOA optical switch is realized the amplification of light signal and the switch of light path; The SOA module of selecting for use adopts the photon integrated technology, and (up 1310nm amplifies with two-way SOA; Descending 1490nm amplifies) be integrated in inside the module of a butterfly encapsulation, the module coupling has encapsulated the access of 4 optical fiber interface realization uplink and downlink signals.
Each SOA optical switch all is connected to drive circuit and temperature control circuit.The master is connected to drive circuit 1 and temperature control circuit 1 with SOA optical switch SOA1, and subsequent use SOA optical switch SOA2 is connected to drive circuit 2 and temperature control circuit 2.The break-make of SOA realizes through the drive circuit of control SOA.Each drive circuit is connected to the corresponding controling end of control logic circuit respectively, and drive circuit 1 is connected to the switch of control logic circuit and controls 1 end, and drive circuit 2 is connected to the switch of control logic circuit and controls 2 ends.SOA is the threshold value device, for obtaining modulation rate, reduction modulated current faster, should add a direct current biasing to SOA.Select direct current prebias electric current to consider several aspects: 1, to strengthen dc bias current and make it approach threshold value; Can reduce Electro-Optical Delay Time; Can also suppress relaxation oscillations; When the SOA bias current was near threshold value, less Modulation Pulse Current just can obtain enough output optical pulses, can reduce pattern effect like this and bind up one's hair thermal effect.2, bias current can not be excessive, because there is certain spontaneous emission noise (ASE) output in SOA itself, the light signal extinction ratio of behind SOA, exporting worsened, and reduces the performance index of optical switch.
The SOA drive circuit can be changed the control signal of control logic circuit output and the reference level signal of external toggle switch setting, is loaded into upward formation light signal amplification output of SOA thereby finally change current signal into.External toggle switch is provided with drive circuit and injects the direct current biasing of SOA and the size of ac modulated current, to realize the modulation to the SOA optical signal gain.As shown in Figure 6, drive circuit is accepted the input of control signal and the setting of reference level dial-up, is connected to the current switch drive circuit through after the level conversion, through this circuit control modulated current (I
s) break-make.Modulated current and dc bias current (I
o) provide by modulation constant-current source and biasing constant-current source respectively, two electric currents accumulate total current (I
Total) supply lumination of light emitting diode, with control SOA drive circuit.Therefore, the relation of three kinds of electric currents is I
Total=I
o+ I
sThe control that the modulation constant-current source is modulated current control circuit, the biasing constant-current source receives the control of bias current control circuit.External toggle switch is provided with the size of direct current biasing and ac modulated current that drive circuit injects SOA with the modulation of realization to the SOA optical signal gain.
As shown in Figure 7, temperature control circuit can guarantee that SOA is operated under the stationary temperature.Temperature control circuit comprises bridge circuit, integrating amplification circuit, adder, absolute value circuit, temperature control chip and SOA refrigerator, and they link to each other successively.The temperature control chip is the external impressed current detector also.Bridge circuit comprises two arms, and an arm comprises resistance, the thermistor R that resistance is R
c, resistance that it is R that another arm also comprises a resistance and feedback resistance R
fTemperature control circuit utilizes the inner thermistor of SOA to constitute an arm of feedback circuit electric bridge, works when causing variations in temperature thermistor R as SOA like this
CResistance change accordingly; Electric bridge two arms produce voltage difference; Realize the voltage difference amplification through integrating amplification circuit; This reference electrode pressure reduction is offered the temperature control chip, and then adjust the electric current in the removal TEC circuit (TEC) in the SOA refrigerator accordingly, thereby realize laser works temperature controlling and monitoring in real time.
SOA control circuit of the present invention; Can be to different transmission range and branching ratio requirements in the practical applications; Switch controlling signal through control logic circuit output; Through the level conversion of drive circuit control unit, controlling the ac modulated current of drive circuit and whether exporting, control passing through and shutoff of light signal.
The SOA optical switch is optional-48V direct current or 220V Alternating Current Power Supply, externally export 5V or 3.3V direct voltage.Optical interface has indicator light pilot light line state, and has outside toggle switch to regulate the parameters such as gain of SOA according to the practical applications situation.The parameter of the available SOA optical switch of the present invention is: the maximum bias electricity electric current of up SOA device is 200mA, and the light signal maximum gain is 20dB, and saturation output power is 0dBm, and noise figure is 7dB, and gain flatness is 3dB, and Polarization-Dependent Gain is less than 1dB.The maximum bias electricity electric current of descending SOA device is 450mA, and the light signal maximum gain is 13dB, and saturation output power is 13dBm, and noise figure is 7dB, and gain flatness is 3dB, and Polarization-Dependent Gain is less than 1dB.
Optical branching device comprises descending optical branching device and up optical branching device.Descending optical branching device comprises the first one-to-two optical branching device splitter1 (splitting ratio 1: 2), and its two outputs are connected to main descending input port with SOA optical switch SOA1 and subsequent use SOA optical switch SOA2 respectively.Up optical branching device comprises two-in-one optical branching device splitter0 (splitting ratio 2: 1), the second one-to-two optical branching device splitter2 (splitting ratio 1: 2) and the 3rd one-to-two optical branching device splitter3 (splitting ratio 1: 2).The input of the second one-to-two optical branching device splitter2 is connected to main up output with SOA optical switch SOA1, and two outputs of the second one-to-two optical branching device splitter2 are connected to the input of two-in-one optical branching device splitter0 respectively and use photo-detector PD1 with the master.The input of the 3rd one-to-two optical branching device splitter3 is connected to the up output of subsequent use SOA optical switch SOA2, and two outputs of the 3rd one-to-two optical branching device splitter3 are connected to another input and the subsequent use photo-detector PD2 of two-in-one optical branching device splitter0 respectively.
The OLT optical interface is divided into 1310nm, 1490nm light signal light path through 1310/1490 wave band WDM1 device of inside: the descending light path of 1490nm connects the 1490nm input of two-way SOA module through descending optical branching device (splitter1); The 1310nm uplink optical signal of the amplification of process SOA module; At first be divided into two-way through 1 1:2 splitter (splitter2 or splitter3); Wherein one the tunnel connect PD detector (PD1 or PD2) and be used for acquisition of signal; Another road connects the branch end of 1 2:1 splitter (splitter0) again, the 1310nm input of total termination WDM1 device of this splitter.
Fig. 4 is the optical detection circuit diagram.The optical detection circuit is through photodiode PD receiving optical signals, and it can adopt the 1310nm PIN receiving unit of coaxial packaging, typical receiving sensitivity＜-40dBm, bandwidth requirement is very low.The negative electrode of photodiode PD meets external 5V power supply VCC, and its anode is connected to sampling resistor R1, also links to each other with the backward end of feedback amplifier A.The other end ground connection of sampling resistor R1.The end in the same way of feedback amplifier A is through resistance R 2 ground connection.The output feedback of feedback amplifier A is connected to reverse input end, also is connected to the base stage of triode T.The collector electrode output voltage signal V of triode T
Los, also be connected to the 3.3V external power supply through resistance R 4.The base stage of triode T and inter-collector also are connected to resistance R 3.The grounded emitter of triode T.
Realize the detection of burst, at first will be clear that the registration process of PON agreement regulation.With the EPON technology is example, and the principle of Multi-point Control Protocol (MPCP) is: OLT finds window at the downlink broadcast passage according to fixing cycle unlatching.Wait until door (Gate) message from OLT after ONU powers on, just send acknowledgement frame to OLT, open registration process by OLT control then, only in the time window that OLT authorizes, ONU just is allowed to transmitting optical power.After the uplink optical signal of ONU at first amplified output through SOA module (SOA1 or SOA2), the splitter (splitter2 or splitter3) through 1:2 connect PD detector (PD1 or PD2) again.The PD detector converts light signal into photoelectric current, and electric current converts voltage signal into through sampling resistor R1.The receiving sensitivity of considering OLT is generally-28dBm about; Cross when low when received optical power, system can show wild effects such as BER alarm, FER alarm and ONU often go offline, therefore when PD surveys sampling resistor R1 can adjust to-during 31dBm (Insertion Loss of 1:2 splitter is 3dBm); Sampling voltage is 0.7V; When luminous power less than critical value (31dBm) time triode T by, detection circuit does not have pulse signal output, when luminous power triode T saturation conduction during greater than critical value; The inverted burst signal output (it is 0 that the light time is arranged, and is 1 when unglazed) of LVTTL level is arranged.Can see with the oscilloscope test, in the fixed cycle about 0.5ms, can detect a plurality of pulse signals.Be noted that ONU has only received the Gate message of OLT, just can send answer signal,, just can judge that light path has problem if therefore PD surveys less than light signal to OLT.In sum, photo-detector passes through voltage signal V through discharge circuit 1 or discharge circuit 2 with the state information of corresponding light path
LosBe sent to control logic circuit.Uppermost logical layer sketch map among Fig. 3, middle luminous power layer sketch map, nethermost sequential sketch map be corresponding each other, clearly reacted the principle that the present invention realizes burst signal detection.On the logical layer, idle transmission time (not having transmission) and Frame alternate.Power rising, the decline or unglazed of idle transmission time (3.3V high level in the sequential chart) corresponding luminous power layer, the relevant sublayer (PMD) of the corresponding physical media of Frame (0V low level in the sequential chart) stable region.
As shown in Figure 5, control logic circuit can use CPLD (CPLD).Optical signals synchronizing information that ONU reports and Frame are formed, and the agreement burst time of EPON regulation is not less than 512ns.The agreement burst time comprises lock in time and elongated protocol Data Unit (PDU) frame length.Comprise light make-and-break time (Laser_on/off) and settling time (settling time) lock in time again.EPON is strict for the agreement of GPON burst time ratio, and for being not less than 64ns, the length of minimum data frame or PDU message frame is 64 bytes, if according to the speed of 1Gbps, then the duration of ONU uplink optical signal is not less than 0.5 μ s.CPLD is according to the reference frequency of 10MHz, regularly the LOS pulse signal of per 0.5 μ s (or frequency) faster once sampling two-way photo-detector output.CPLD set inside multidigit counter, during sampling if low level (light is arranged) then counter add 1, and regularly every at a distance from 2ms to counter O reset.CPLD is also every to judge the relatively state of the counter of two-way detectable signal at a distance from 1ms.CPLD opens and turn-offs according to judged result control SOA optical switch, realizes the APS of optical fiber: use line fault if judge the master, then be switched to extension wire, otherwise still; If two-way is all surveyed less than signal, then the CPLD control logic can every be opened two-way SOA optical switch at a distance from 2s successively by turns, surveys light signal, has light signal to report until detect wherein one the tunnel.Since fairly simple to the judgement of trunk optical fibre protection inverting, only judge the optical power signals that ONU reports basically, thus protect the time of switching and recovering very short, design＜3ms, actual test switching time is 2.8ms.In a word, the switch controlling signal of CPLD control logic circuit output through the level conversion of overdrive circuit control unit, is being controlled the ac modulated current of drive circuit and whether is being exported, and controls passing through and shutoff of light signal.
Claims (1)
1. based on the burst type ultralong distance fiber optic protection device of SOA optical switch, it is characterized in that: comprise optical line terminal interface, optical branching device, SOA optical switch, trunk optical fiber interface, they join in order; Optical branching device also links to each other with photo-detector, control logic circuit successively; Control logic circuit also links to each other with the SOA optical switch; Optical branching device comprises descending optical branching device and up optical branching device;
The SOA optical switch comprises main with SOA optical switch and subsequent use SOA optical switch, and the trunk optical fiber interface comprises main with optical interface and subsequent use optical interface, and photo-detector comprises main with photo-detector and subsequent use photo-detector; The master is connected to main with optical interface and the main photo-detector of using respectively with SOA optical switch two ends; Subsequent use SOA optical switch two ends are connected to subsequent use optical interface and subsequent use photo-detector respectively; The master links to each other with optical interface with main through second wavelength division multiplexer with the SOA optical switch, and subsequent use SOA optical switch links to each other with subsequent use optical interface through the 3rd wavelength division multiplexer; Primary and backup photo-detector also is sent to control logic circuit with the state information of corresponding light path through voltage signal through discharge circuit; Thereby opening and turn-offing of control logic circuit output switch control signal to drive circuit control SOA optical switch realizes the APS of optical fiber;
Descending optical branching device comprises the first one-to-two optical branching device, and its two outputs are connected to main descending input port with SOA optical switch and subsequent use SOA optical switch respectively; Up optical branching device comprises two-in-one optical branching device, the second one-to-two optical branching device and the 3rd one-to-two optical branching device; The optical line terminal interface links to each other through first wavelength division multiplexer and the output of two-in-one optical branching device and the input of the first one-to-two optical branching device; The input of the second one-to-two optical branching device is connected to main up output with the SOA optical switch, and two outputs of the second one-to-two optical branching device are connected to an input of two-in-one optical branching device respectively and use photo-detector with the master; The input of the 3rd one-to-two optical branching device is connected to the up output of subsequent use SOA optical switch, and two outputs of the 3rd one-to-two optical branching device are connected to another input and the subsequent use photo-detector of two-in-one optical branching device respectively.
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| US9647757B2 (en) * | 2014-04-21 | 2017-05-09 | Arris Enterprises, Inc. | Systems and methods for optical modulation index calibration in a CATV network |
| US10476587B2 (en) * | 2016-05-31 | 2019-11-12 | Alibaba Group Holding Limited | System and method for enhancing reliability in a transport network |
| CN106773986B (en) * | 2016-12-30 | 2019-03-19 | 广州傲视物联网信息技术有限公司 | Digital Transmission case and fault diagnosis system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101207443A (en) * | 2007-11-29 | 2008-06-25 | 华为技术有限公司 | System, apparatus and method for locking injection of light source |
| CN201114093Y (en) * | 2007-06-15 | 2008-09-10 | 上海未来宽带技术及应用工程研究中心有限公司 | Optical fibre line protector for protecting PON network |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201114093Y (en) * | 2007-06-15 | 2008-09-10 | 上海未来宽带技术及应用工程研究中心有限公司 | Optical fibre line protector for protecting PON network |
| CN101207443A (en) * | 2007-11-29 | 2008-06-25 | 华为技术有限公司 | System, apparatus and method for locking injection of light source |
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