CN200993681Y - Opticalfiber all-optical data converter - Google Patents
Opticalfiber all-optical data converter Download PDFInfo
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- CN200993681Y CN200993681Y CNU2006201633619U CN200620163361U CN200993681Y CN 200993681 Y CN200993681 Y CN 200993681Y CN U2006201633619 U CNU2006201633619 U CN U2006201633619U CN 200620163361 U CN200620163361 U CN 200620163361U CN 200993681 Y CN200993681 Y CN 200993681Y
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Abstract
The utility model discloses an optical fiber type all-optical code transducer, which comprises a temperature control circuit, an optical fiber type Mach-Zehnder interometer, a heat conducting heat sink, a thermistance and a cooling plate. Wherein, the interometer is formed by linking two 3dB coupling mechanisms on the heat conducting heat sink; the relationship between the length difference triangle L of two arms and the timelag difference triangle T is in formula as below: triangle L is equal to c multiply with triangle T/n; wherein, the c refers to the velocity of light in vacuum, the n refers to the optical fiber refractive index. The thermistance is used for detecting the interometer temperature and the temperature control circuit is used for comparing the detected voltage with the designed voltage fed back by the thermistance and adjusting the working current of a semiconductor refrigerator; the semiconductor refrigerator cools and heats for the two interometer arms through the heat conducting heat sink simultaneously. The utility model, compared with other all-optical code of transduction device, is free of speed limitation and can lower the signal noise, fulfill the conversion of various codes with stable result.
Description
Technical field
The utility model belongs to field of optical device technology, is specially a kind of optical fiber all-optical data converter.The utility model is applicable to high speed optical communication system, can solve return-to-zero code RZ in this system and arrive the multiple full optical code type transfer problem of doubinary system Carrier-Suppressed Return-to-Zero DCSRZ to nonreturn to zero code NRZ, nonreturn to zero code NRZ to pseudo-return-to-zero code PRZ, differential phase keying (DPSK) sign indicating number DPSK on ﹠ off switch control code OOK, differential phase keying (DPSK) sign indicating number DPSK.
Background technology
Along with the generation of various novel sign indicating number types in the present optical communication system, the switch technology between the different sign indicating number types becomes the research focus of full light signal in handling.Full optical code type conversion is played important effect in optical network interface, full light 3R regeneration, high-speed optical signal transmission and reception etc. aspect numerous.
Realize following two-forty, high capacity optical communication network, tool prospect be that dense wave division multipurpose (DWDM) and Optical Time Division Multiplexing (OTDM) technology are combined, constitute subnet with DWDM, and a plurality of DWDM subnets interconnection formed with the OTDM high speed signal.In the lower DWDM network of speed, be partial to use the modulation format of nonreturn to zero code (NRZ), and, then be partial to adopt the modulation format of return-to-zero code (RZ) in the higher OTDM system of speed.Therefore the sign indicating number type between RZ sign indicating number and the NRZ sign indicating number is converted into an important interfacing of following optical communication network.
Clock recovery technology in the full light 3R regeneration is a gordian technique that realizes high speed optical communication system.But great majority are used the clock recovery that all is confined to the RZ sign indicating number at present, because RZ code book body has clock-pulse component, implement than being easier to; And, realize that all-optical clock recovery is just very difficult for the NRZ sign indicating number that does not comprise clock-pulse component.Problem hereto, the most schemes that adopt are earlier the NRZ sign indicating number to be converted to the PRZ sign indicating number at present, and then extract clock-pulse component from the signal that is converted to.Therefore, the NRZ sign indicating number is very important to the full optical code type conversion of PRZ sign indicating number, and very high practical value is arranged.
Along with improving constantly of the speed and capacity of optical communication system, the on ﹠ off switch control code OOK that nonreturn to zero code (NRZ) and return-to-zero code (RZ) are traditional so can not satisfy higher system requirements, and therefore new-type sign indicating number type is the focus of research at present always.Differential phase keying (DPSK) sign indicating number DPSK is a kind of new sign indicating number type, and its relative on ﹠ off switch control code (OOK) has higher receiving sensitivity and non-linear tolerance, is one of optimum code type that adopts in the following optical communication system.But, the data message of DPSK sign indicating number is carried on the signal phase, therefore the DPSK sign indicating number that carries phase information just is received after must being converted to the OOK sign indicating number that carries amplitude information, and in the DPSK system, the DPSK sign indicating number is to the full optical code type conversion of the OOK sign indicating number key link that is absolutely necessary.
Doubinary system Carrier-Suppressed Return-to-Zero (DCS-RZ) is a kind of up-to-date sign indicating number type that occurred in recent years.Than traditional RZ or NRZ sign indicating number type, it has stronger chromatic dispersion and non-linear tolerance, and transmission range increases greatly in the system of no chromatic dispersion compensation thereby make, and it also has narrow bandwidth, the band efficiency advantages of higher is a kind of new-type sign indicating number type that has application prospect.Along with popularizing of the jumbo all-optical network of two-forty, DCS-RZ sign indicating number type will be more widely used and develop.
Realize that RZ mainly contains following several to the method for the full optical code type conversion of NRZ: the method for the Mach-Zehnder interferometer SOA-MZI of (one) based semiconductor image intensifer.Owing to the restriction of release time of SOA charge carrier, can not be applicable to high speed signal; (2) based on the go in ring method of mirror (NOLM) of nonlinear optical fiber.This method utilization be the Kerr effect of optical fiber, therefore must introduce control light, increased the complexity and the cost of equipment; (3) based on the method for the injection locking of Fabry one Perot FB laser instrument.This method can be with the multiplexing and sign indicating number type counter-rotating of unnecessary rate.
Realize that NRZ mainly contains following several to the method for the full optical code type conversion of PRZ: (one) based semiconductor image intensifer SOA is from the method for phase modulation (PM) (SPM).This method is subjected to the restriction of release time of SOA charge carrier, can not be applicable to high speed signal; (2) based on the go in ring method of mirror (NOLM) of nonlinear optical fiber.This method utilization be the Kerr effect of optical fiber, therefore must introduce control light, increased the complexity and the cost of equipment; (3) based on the method for SOA ring mirror.This method is subjected to the restriction of release time of SOA charge carrier, and the pattern effect of transformation result is extremely serious, and speed is not high yet.
Realize that DPSK mainly contains following several to the method for the full optical code type conversion of OOK: (one) directly compares the phase differential of front and back code element based on the sign indicating number type conversion of Mach-Ze De time delay interferometer structure.But the difficulty of this structure is that it is difficult to stablize, and is easy to be subjected to the influence of environment such as temperature, shake; (2) method of the injection locking of based semiconductor laser instrument, but the longitudinal mode that the dpsk signal that injects must produce with laser-assisted on polarization direction and wavelength is complementary, and therefore the service condition of this method is very harsh; (3) based on the method for polarization maintaining optical fibre, relevant but method remains polarization, must determine the polarization direction of input signal light, and the polarization direction of input signal light can change at any time in the actual transmissions system; (4) based on the method for birefringence fiber ring, basic structure is a birefringence fiber ring that has Polarization Controller (PC).But its main deficiency is the polarization state of Polarization Controller output and is difficult to stablize.
At present, the full optical code type conversion all can only be changed at a certain sign indicating number type, and all exists the equipment complexity, and speed is lower, and a series of problems such as poor stability have produced serious restriction to the high speed full optical networks development.
Summary of the invention
The purpose of this utility model is to provide a kind of multi-functional tunable type optical fiber all-optical data converter, this apparatus structure is simple, speed is transparent, good stability, by adjust working temperature can realize RZ to NRZ, NRZ to PRZ, the multiple full optical code type of DPSK to OOK, DPSK to DCSRZ change.
A kind of optical fiber all-optical data converter that the utility model provides is characterized in that: this converter comprise temperature control circuit and be positioned at that optical-fiber type Mach-Zehnder interferometer, the heat conduction of seal box is heat sink, semiconductor cooler, thermistor and heat radiator; Wherein interferometer forms by being positioned at two three-dB coupler cascades of heat conduction on heat sink, and the pass between the delay inequality Δ T of the length difference Δ L of two arms and generation is Δ L=c Δ T/n, and c is the light velocity in the vacuum, and n is an optical fibre refractivity; Heat conduction is heat sink to be positioned on the semiconductor cooler, heat radiator is housed on the semiconductor cooler, semiconductor cooler all links to each other with temperature control circuit with thermistor, thermistor is used for the temperature of interferometer is surveyed, temperature control circuit is used for the detecting voltage and the setting voltage of comparison thermistor feedback, working current to semiconductor cooler is regulated, and semiconductor cooler freezes simultaneously or heats interferometer two arms by heat conduction is heat sink.
Above-mentioned temperature control circuit comprises power module, reference and setting voltage module, temperature control module, A/D modular converter, single chip processing module and display module; Wherein, reference and setting voltage module are used for providing A/D the reference voltage of conversion to the A/D modular converter, and for temperature control module provides setting voltage, also this setting voltage are sent to the A/D modular converter; Temperature control module is used for the detecting voltage and the setting voltage of comparison thermistor feedback, and the working current of output control semiconductor cooler; The A/D modular converter is used to receive the setting voltage of self-reference and setting voltage module and the detecting voltage of thermistor, and becomes data-signal to send single chip processing module to analog signal conversion; Single chip processing module receives the digital signal from the A/D modular converter, judges the magnitude of voltage of sampling, and is translated into corresponding temperature value and offers display module, display setting temperature and detecting temperature.
The utility model is realized multiple sign indicating number type translation function based on the optical-fiber type Mach Zehnder interferometer: be completely without the source device, and nonexistent code type effect, converted output signal quality height; There is not the restriction of switching rate in theory, can be higher than 100Gb/s; Both arms to interferometer carry out temperature control, can improve temperature stability and temperature controlled precision; When the delay inequality of two arms is 25ps, regulate the working temperature of fibre optic interferometer, the phase differential of setting two arms is respectively 0 or 180 when spending, the RZ that can realize 20Gb/s changes to the NRZ of the conversion of NRZ sign indicating number type, 40Gb/s to PRZ sign indicating number type, the dpsk signal of 40Gb/s to the dpsk signal of OOK conversion of signals and 40Gb/s to the DCS-RZ function switching signal.This invention be expected in high-speed optical transmission system, to be used as separating of dpsk signal be in harmonious proportion receive, the sign indicating number type in full photo reversal, DWDM and the OTDM interface of NRZ signal is changed and the generation of duobinary signal or the like.
Description of drawings
The structural representation of the sign indicating number type converter that Fig. 1 provides for the utility model;
Fig. 2 is the vertical view of optical-fiber type Mach-Zehnder interferometer among Fig. 1;
Fig. 3 is temperature controlled process flow diagram;
Fig. 4 is the temperature control circuit design frame chart;
Fig. 5 is the schematic diagram of RZ to the sign indicating number type conversion of NRZ;
Fig. 6 is the schematic diagram of NRZ to the sign indicating number type conversion of PRZ;
Fig. 7 is the schematic diagram of DPSK to the sign indicating number type conversion of OOK;
Fig. 8 is the schematic diagram of DPSK to the sign indicating number type conversion of DCS-RZ.
Embodiment
The light signal of source code type enters from the input port of interferometer, by regulating the temperature of optical fiber, the phase place when changing the light signal interference, the light signal of sign indicating number type after the output port of interferometer can obtain changing.Structure of the present utility model as shown in Figure 1, it comprises optical-fiber type Mach-Zehnder interferometer 1 and the temperature control system that is positioned at seal box 2, and two arms of optical-fiber type interferometer are carried out temperature control simultaneously, can obtain higher control accuracy, improves stability.Temperature control system comprises that heat conduction is heat sink 3, semiconductor cooler 4, thermistor 5, heat radiator 6 and temperature control circuit 7, and except that temperature control circuit 7, all the other each parts all are arranged in seal box 2, and seal box 2 is isolated these parts and external environment.As shown in Figure 2, optical-fiber type Mach-Zehnder interferometer 1 is cascaded up by welding optic fibre or the method by direct drawing by two three- dB couplers 8,9, have input port P1, P2 and output port P3, P4, the length difference Δ L of interferometer two arms is relevant with operating rate, pass between the delay inequality Δ T of length difference Δ L and generation is Δ L=c Δ T/n, c is the light velocity in the vacuum, and n is an optical fibre refractivity under a certain temperature.When operating rate was 40Gbit/s, interferometer two arm lengths difference Δ L were 5.2mm, and being converted into delay inequality Δ T is 25ps.Temperature change, phase differential changes between two arms, can realize different sign indicating number type translation functions.Two three- dB couplers 8,9 and welding optic fibre are fixed in the heat conduction heat sink 3 with glue.Heat conduction is heat sink 3 to be positioned on the semiconductor cooler 4, and heat radiator 6 is housed on the semiconductor cooler 4.Semiconductor cooler 4 all links to each other with temperature control circuit 7 with thermistor 5, thermistor 5 is used for the temperature of interferometer is surveyed, temperature control circuit 7 is used for the detecting voltage and the setting voltage of comparison thermistor 5 feedbacks, and the working current of semiconductor cooler 4 is regulated.Semiconductor cooler freezes simultaneously or heats interferometer two arms by heat conduction is heat sink.
The ultimate principle of sign indicating number type of the present utility model conversion is, at first the light signal of source code type is divided into two-way from being coupled device 8 after input port P1 of interferometer 1 or P2 enter, transmit the back respectively through interferometer two arms then and produce at coupling mechanism 9 places and interfere, can obtain changing the light signal of back sign indicating number type at last at two output port P3 and P4.The refractive index of optical fiber is subjected to temperature variation and changes, temperature control system is by regulating the temperature of interferometer two arms simultaneously, change the refractive index of optical fiber, thereby can change the phase differential ΔΦ of the light signal that causes by arm length difference Δ L, the phase differential ΔΦ is adjustable in 0～360 ° of gamut, by setting different phase differential, can obtain different sign indicating number type conversions.
As shown in Figure 3, temperature control process of the present utility model is, at first survey by the temperature of 5 pairs of interferometers 1 of thermistor, temperature control circuit 7 is by comparing the detecting voltage and the setting voltage of thermistor 5 feedbacks then, working current to semiconductor cooler 4 is regulated, last semiconductor cooler 4 freezes simultaneously by 1 liang of arm of the heat sink 3 pairs of interferometers of heat conduction or heats, and makes it reach needed temperature.
Fig. 4 has enumerated the schematic diagram of a kind of implementation of temperature control circuit.Temperature control circuit comprises power module 10, reference and setting voltage module 11, temperature control module 12, A/D modular converter 13, single chip processing module 14 and display module 15.Each module all can adopt existing techniques in realizing, as long as select the good existing thermoelectric controller of temperature stability (for example WTC3243) for use as temperature control module 12.
Power module 10 provides power supply for each module in the circuit for regulating and controlling.Reference and setting voltage module 11 are used for providing A/D the reference voltage of conversion to A/D modular converter 13, and for temperature control module 12 provides setting voltage, also this setting voltage are sent to A/D modular converter 13 simultaneously.Behind temperature control module 12 the detecting voltage and setting voltage that relatively thermistor 5 feeds back, the working current of output control semiconductor cooler 4; A/D modular converter 13 is used to receive the setting voltage of self-reference and setting voltage module 11 and the detecting voltage of thermistor 5, and becomes data-signal to send single chip processing module 14 to analog signal conversion; The digital signal that single chip processing module 14 receives from A/D modular converter 13 is judged the magnitude of voltage of sampling, and is translated into corresponding temperature value.Single chip processing module 14 offers display module 15 with this temperature value, display setting temperature and detecting temperature.
The following describes the utility model and realize the concrete principle of work of various sign indicating number type conversion.
RZ changes to the sign indicating number type of NRZ: as shown in Figure 5, speed is that the RZ signal of 20Gb/s enters MZI from port P1, is divided into two-way through behind the three-dB coupler 8, and one the tunnel produces the time-delay of 25ps, phase differential ΔΦ=0 ° is set by temperature control system in another road, and this moment, port P3 was constructive interference.The minimum of intensity that the peak value of " 1 " of road signal after the delay is just in time aimed at undelayed that road signal with the pulse strenching of signal " 1 ", like this, is output as the NRZ signal at port P3 after the coherence stack.
NRZ changes to the sign indicating number type of PRZ: as shown in Figure 6, speed is that the NRZ signal of 40Gb/s is imported from port P1, is divided into two-way through behind the three-dB coupler 8, and one the tunnel produces the time-delay of 25ps, another road setting phase differential ΔΦ=180 °, this moment, port P3 was destructive interference.Two ways of optical signals has been done a nonequivalence operation at coupling mechanism 9 places up and down, and promptly when the two-way input signal was " 1 " and " 0 ", output signal was " 1 "; When the two-way input signal was " 1 " or is " 0 ", output signal was " 0 ", and the phase differential of π is arranged between adjacent " 1 " of output signal, like this, was output as the PRZ signal at port P3.
DPSK changes to the sign indicating number type of OOK: as shown in Figure 7, speed is that the dpsk signal of 40Gb/s enters MZI from port P1, be divided into two-way through behind the three-dB coupler 8, one the tunnel produces the time-delay of 25ps, it is the time width of a bit of dpsk signal, another road setting phase differential ΔΦ=0 °, this moment, port P3 was constructive interference.If the phase place of input signal adjacent bit is identical, then relevant the reinforcement, output signal is " 1 "; If the phase place of adjacent bit is opposite, then relevant the counteracting, output signal is " 0 ", like this, the DPSK sign indicating number that carries phase information just is converted to the OOK sign indicating number that carries amplitude information.In the sign indicating number type conversion of OOK, the utility model can be realized the conversion of three kinds of different DPSK sign indicating number types to corresponding OOK sign indicating number type, is respectively NRZ-DPSK to NRZ at DPSK, and RZ-DPSK is to RZ, and CSRZ-DPSK is to the sign indicating number type conversion of CSRZ.
DPSK changes to the sign indicating number type of DCS-RZ: as shown in Figure 8, speed is that the dpsk signal of 40Gb/s enters MZI from port P1, is divided into two-way through behind the three-dB coupler 8, and one the tunnel produces the time-delay of 25ps, another road setting phase differential ΔΦ=180 °, this moment, port P3 was destructive interference.If the phase place of input signal adjacent bit is identical, then relevant the counteracting, output signal is " 0 "; If the phase place of adjacent bit is opposite, then relevant the reinforcement, output signal is " 1 ", and has the phase differential of π, just doubinary system Carrier-Suppressed Return-to-Zero DCS-RZ between adjacent " 1 " of output signal.The utility model can be realized three kinds of different DPSK sign indicating number NRZ-DPSK, RZ-DPSK, and CSRZ-DPSK is to the conversion of DCS-RZ sign indicating number.
Claims (2)
1, a kind of optical fiber all-optical data converter is characterized in that: this converter comprise temperature control circuit (7) and be positioned at optical-fiber type Mach one Zehnder interferometer (1) of seal box (2), heat conduction is heat sink (3), semiconductor cooler (4), thermistor (5) and heat radiator (6); Wherein interferometer (1) is formed by two three-dB couplers (8, the 9) cascade that is positioned in the heat conduction heat sink (3), and the pass between the delay inequality Δ T of the length difference Δ L of two arms and generation is Δ L=c Δ T/n, and c is the light velocity in the vacuum, and n is an optical fibre refractivity; Heat conduction is heat sink (3) is positioned on the semiconductor cooler (4), heat radiator (6) is housed on the semiconductor cooler (4), semiconductor cooler (4) all links to each other with temperature control circuit (7) with thermistor (5), thermistor (5) is used for the temperature of interferometer (1) is surveyed, temperature control circuit (7) is used for the detecting voltage and the setting voltage of comparison thermistor (5) feedback, working current to semiconductor cooler (4) is regulated, and semiconductor cooler (4) freezes simultaneously to interferometer (1) two arm by heat conduction heat sink (3) or heats.
2, converter according to claim 1 is characterized in that: described temperature control circuit (7) comprises power module (10), reference and setting voltage module (11), temperature control module (12), A/D modular converter (13), single chip processing module (14) and display module (15); Wherein, reference and setting voltage module (11) are used for providing A/D the reference voltage of conversion to A/D modular converter (13), and provide setting voltage for temperature control module (12), also this setting voltage are sent to A/D modular converter (13); Temperature control module (12) is used for the detecting voltage and the setting voltage of comparison thermistor (5) feedback, and the working current of output control semiconductor cooler (4); A/D modular converter (13) is used for receiving self-reference and the setting voltage of setting voltage module (11) and the detecting voltage of thermistor (5), and becomes data-signal to send single chip processing module (14) to analog signal conversion; Single chip processing module (14) receives the digital signal from A/D modular converter (13), judges the magnitude of voltage of sampling, and is translated into corresponding temperature value and offers display module (15), display setting temperature and detecting temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2006201633619U CN200993681Y (en) | 2006-12-01 | 2006-12-01 | Opticalfiber all-optical data converter |
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| CNU2006201633619U CN200993681Y (en) | 2006-12-01 | 2006-12-01 | Opticalfiber all-optical data converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109969616A (en) * | 2019-05-27 | 2019-07-05 | 北京中创为南京量子通信技术有限公司 | A kind of vibration damping temperature control device and vibration damping temperature control optical fiber interferometer arrangement |
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2006
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109969616A (en) * | 2019-05-27 | 2019-07-05 | 北京中创为南京量子通信技术有限公司 | A kind of vibration damping temperature control device and vibration damping temperature control optical fiber interferometer arrangement |
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