CN105099570A - Orthogonal multi-carrier light source and PDM-QPSK signal transmitting device - Google Patents

Orthogonal multi-carrier light source and PDM-QPSK signal transmitting device Download PDF

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Publication number
CN105099570A
CN105099570A CN201410218720.5A CN201410218720A CN105099570A CN 105099570 A CN105099570 A CN 105099570A CN 201410218720 A CN201410218720 A CN 201410218720A CN 105099570 A CN105099570 A CN 105099570A
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signal
radio frequency
light
qpsk
optical
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CN105099570B (en
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迟楠
余建军
苏婕
黄新刚
马壮
张佩华
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Fudan University
ZTE Corp
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Fudan University
ZTE Corp
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Priority to PCT/CN2014/093989 priority patent/WO2015176527A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/548—Phase or frequency modulation
    • H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Communication System (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention discloses an orthogonal multi-carrier light source and PDM-QPSK signal transmitting device, wherein the orthogonal multi-carrier light source comprises the components of a sinusoidal RF signal source which is used for outputting a sinusoidal RF signal with a preset signal frequency to a power divider; the power divider which is used for dividing the input sinusoidal RF signal to a left sinusoidal RF signal and a right sinusoidal RF signal; a first electric power amplifier which is used for performing power amplification on the left sinusoidal RF signal; a phase shifter which is used for adjusting the right sinusoidal RF signal; a second electric power amplifier which is used for performing power amplification on the right sinusoidal RF signal that is adjusted by the phase shifter; an electric absorption modulation laser which is used for generating an optical signal in response to driving of the left sinusoidal RF signal that is output by the first electric power amplifier; and a phase modulator which is used for modulating the input optical signal and generating multiple orthogonal carriers with a fixed frequency in response to the right sinusoidal RF signal that is output by the second electric power amplifier.

Description

Orthogonal multiple carrier light source and PDM-QPSK sender unit
Technical field light
The present invention relates to coherent communication field, specifically, relate to a kind of orthogonal multiple carrier light source and palarization multiplexing orthogonal phase modulation (Polarizationdivisionmultiplexedquadraturephaseshiftkeyin g, PDM-QPSK) sender unit.
Background technology
In optical communication field, applying frequency the locking widely and smooth orthogonal multiple carrier of power produces technology, this technology can be used in Microwave photonics, all-optical signal processing, light random waveform occur and wavelength division multiplexing (WDM) ultra broadband light source etc.Particularly when multicarrier is concerned with ultra broadband light source as WDM, orthogonal multiple carrier produces technology and is considered to the crucial enabling tool of of following Tbit/s optical communication.
The main technical schemes at present producing technical elements at orthogonal multiple carrier comprises: (1) is based on the concatenated schemes of phase-modulator (PM) and intensity modulator (IM); (2) based on the concatenated schemes that phase-modulator and frequency multiplication thereof drive; (3) based on the generation scheme of I/Q modulator; (4) the loop multicarrier based on phase-modulation produces scheme; (5) based on the generation scheme etc. that I/Q modulator and frequency displacement loop (RFS) combine.Above scheme all can produce Wavelength tunable, Frequency Locking and the smooth orthogonal multiple carrier of power, but has the deficiency of high insertion loss and high cost.
In the related, also proposed a class and produce scheme based on the multicarrier of directly modulation distributed feedback laser (DML) and phase-modulator cascade, though the program effectively can overcome the high deficiency of above five kinds of scheme costs and have the simple feature of structure, but the subcarrier that the program generates has relatively wide live width (about 25MHz), thus modulate intensity modulated light signal can only be used for, different from modulating PDM-QPSK modulation signal.
But compared with direct detection intensity-modulated signal, coherent detection PDM-QPSK modulation signal has higher spectrum efficiency and application is also increasingly extensive.Thus particularly important for the orthogonal multiple carrier generation technology that can be applied in PDM-QPSK modulation signal coherent light detection system.
For in correlation technique when producing PDM-QPSK modulation signal the problem of the high insertion loss that exists and high cost, at present effective solution is not yet proposed.
Summary of the invention
For in correlation technique when producing PDM-QPSK modulation signal the problem of the high insertion loss that exists and high cost, the invention provides a kind of orthogonal multiple carrier light source and PDM-QPSK sender unit, at least to solve the problem.
According to an aspect of the present invention, provide a kind of orthogonal multiple carrier light source, comprising: Electroabsorption Modulated Laser, phase-modulator, sinusoidal radio frequency signal source, power divider, phase-shifter, the first electrical power amplifier, and the second electrical power amplifier, wherein; Described sinusoidal radio frequency signal source, for exporting the sinusoidal radio frequency signal of prearranged signals frequency to described power divider; Described power divider, for the described sinusoidal radio frequency signal of input is divided into left sinusoidal radio frequency signal and right wing sinusoidal radio frequency signal, described left sinusoidal radio frequency signal is input to described electrical power amplifier, described right wing sinusoidal radio frequency signal is input to described phase-shifter; Described first electrical power amplifier, for carrying out power amplification to described left sinusoidal radio frequency signal, is input to described Electroabsorption Modulated Laser by the described left sinusoidal radio frequency signal after power amplification; Described phase-shifter, for adjusting described right wing sinusoidal radio frequency signal, to make described right wing sinusoidal radio frequency signal synchronous with described left sinusoidal radio frequency signal, and exports the described right wing sinusoidal radio frequency signal after adjustment; Described second electrical power amplifier, for carrying out power amplification to the described right wing sinusoidal radio frequency signal after described phase-shifter adjustment, is input to described phase-modulator by the described right wing sinusoidal radio frequency signal after power amplification; Described Electroabsorption Modulated Laser, for producing light signal under the driving of the described left sinusoidal radio frequency signal of described first electrical power amplifier output, and is input to described phase-modulator by the described light signal produced; Described phase-modulator, under the driving of the described right wing sinusoidal radio frequency signal of described second electrical power amplifier output, modulates the described light signal of input, produces Frequency Locking and orthogonal multicarrier.
Alternatively, also comprise: 2 frequency multipliers, being connected between described phase-shifter and described second electrical power amplifier, for realizing 2 frequencys multiplication of the described right wing sinusoidal radio frequency signal that described phase-shifter exports, the described right wing sinusoidal radio frequency signal after 2 frequencys multiplication being input to described second electrical power amplifier.
Alternatively, described Electroabsorption Modulated Laser comprises: distributed feedback laser, for output optical signal; Electroabsorption modulator, under the driving of the described left sinusoidal radio frequency signal of described first electrical power amplifier output, carries out light modulation to the described light signal that described distributed feedback laser exports, exports the light signal after modulation.
Alternatively, the operating current of described distributed feedback laser is greater than the threshold current of described distributed feedback laser.
Alternatively, the bias voltage of described electroabsorption modulator is in the linear modulation region of described electroabsorption modulator.
Alternatively, described Electroabsorption Modulated Laser also comprises: semiconductor optical amplifier, enters compensation for the described light signal exported described electroabsorption modulator, to compensate the insertion loss of described electroabsorption modulator, exports the light signal after compensating.
Alternatively, the live width of described Electroabsorption Modulated Laser is 1.9MHz.
Alternatively, described phase-modulator is also for increasing by increasing the radiofrequency signal amplitude driving described phase-modulator the orthogonal sub-carriers number generated.
Alternatively, described Electroabsorption Modulated Laser is also for driving the radiofrequency signal amplitude of described Electroabsorption Modulated Laser to make the amplitude of the subcarrier of generation smooth by regulating.
According to another aspect of the present invention, additionally provide a kind of palarization multiplexing orthogonal phase modulation PDM-QPSK sender unit, comprising: the orthogonal multiple carrier light source be linked in sequence, photon carrier selection module and PDM-QPSK optical emitting module; Wherein, described orthogonal multiple carrier light source is above-mentioned orthogonal multiple carrier light source; Described photon carrier selection module comprises: optical add/drop multiplexer, is divided into odd even two parts, odd number road multicarrier or even number road multicarrier are input to adjustable light wave-filter for the multicarrier exported by described quadrature carrier light source; Described adjustable light wave-filter, for bandwidth and wavelength by regulating described adjustable light wave-filter, carries out filtering to obtain required light carrier to input multicarrier; Described PDM-QPSK optical emitting module, comprising: I/Q modulator, and the phase difference of upper and lower two-arm is pi/2, under the light carrier for exporting at described photon carrier selection module driving, producing and exporting light QPSK signal; Polarization multiplexer, light QPSK signal for being exported by I/Q modulator is divided into Liang Ge branch, a wherein road light signal is postponed, power equalization is carried out to another road light signal, then two ways of optical signals is merged, the palarization multiplexing of analog signal, generates PDM-QPSK light signal, is launched by described PDM-QPSK light signal through optical fiber link.
Alternatively, described optical add/drop multiplexer is frequency is 12.5/25-GHz.
Alternatively, described polarization multiplexer comprises: a polarization keeps optical coupler, one section of optical delay line, an optical attenuator and polarization beam combiner, wherein, described polarization keeps optical coupler to be used for the QPSK light signal of input to be divided into Liang Ge branch, wherein a road signal inputs to described optical delay line, and another road then inputs to described optical attenuator; Described optical delay line, for being produced the delay of 150 symbol lengths by the QPSK light signal of simulation to input, inputs to described polarization beam combiner by the QPSK light signal after postponing; Described optical attenuator, the power of the QPSK light signal of Yong Yu Dui Ying adjusts, and realizes the equilibrium to QPSK optical signal power described in two branch roads, and the QPSK light signal after adjustment is inputed to described polarization beam combiner; Described polarization beam combiner, for input two ways of optical signals by merging, the palarization multiplexing of analog signal, generates described PDM-QPSK signal.
Pass through the present invention, adopt based on the orthogonal multiple carrier light source of Electroabsorption Modulated Laser (EML) with phase-modulator (PM) cascade, some can not only be generated and the good subcarrier of flatness, also effectively overcome in DML and PM concatenated schemes and generate the excessive deficiency of subcarrier live width, thus coherent light reception can be carried out to high speed PDM-QPSK modulation signal.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, and form a application's part, schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the orthogonal multiple carrier light source according to the embodiment of the present invention;
Fig. 2 is the schematic diagram of the spectrum according to the output of embodiment of the present invention orthogonal multiple carrier light source;
Fig. 3 A is the structural representation of the PDM-QPSK sender unit according to the embodiment of the present invention;
Fig. 3 B is the structural representation of the PDM-QPSK signal coherence optical receiver system according to the embodiment of the present invention;
Fig. 4 is the structural representation of the photon carrier selection module according to the embodiment of the present invention;
Fig. 5 is the spectrogram of the odd number road multicarrier that the optical add/drop multiplexer of the photon carrier selection module adopted in the embodiment of the present invention exports;
Fig. 6 is the spectrogram of the required photon carrier wave that the photon carrier selection module polarization adopted in the embodiment of the present invention keeps adjustable light wave-filter to export;
Fig. 7 is the structural representation according to the PDM-QPSK optical emitting module in the embodiment of the present invention;
Fig. 8 is the structural representation of the homodyne coherent light detecting module according to the embodiment of the present invention.
Embodiment
Hereinafter also describe the present invention in detail with reference to accompanying drawing in conjunction with the embodiments.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.
According to the embodiment of the present invention, provide a kind of orthogonal multiple carrier light source.
Fig. 1 is the structural representation of the orthogonal multiple carrier light source according to the embodiment of the present invention, as shown in Figure 1, this orthogonal multiple carrier light source mainly comprises: Electroabsorption Modulated Laser (EML), phase-modulator (PM), sinusoidal radio frequency signal source, power divider, phase-shifter (PS) and 2 electrical power amplifier (EA).
Wherein, described sinusoidal radio frequency signal source is used for the sinusoidal radio frequency signal exporting prearranged signals frequency (such as, 12.5GHz) to described power divider.Described power divider is used for the sinusoidal radio frequency signal of input to be divided into left and right two-way, and left signal is input to first electrical power amplifier (EA), right wing signal inputs to described phase-shifter.First electrical power amplifier, carries out power amplification to the left sinusoidal radio frequency signal that power divider exports, the signal after power amplification is inputted described Electroabsorption Modulated Laser (EML) as radio-frequency (RF) driving signal.In embodiments of the present invention, the Main Function of this electrical power amplifier is that left sinusoidal radio frequency signal carries out power amplification, and therefore, the left radiofrequency signal amplitude exported through electrical power amplifier by reasonable adjusting can produce suitable number of sub carrier wave and flatness.Described phase-shifter adjusts described right wing sinusoidal radio frequency signal, to make described right wing sinusoidal radio frequency signal synchronous with described left sinusoidal radio frequency signal, and exports the described right wing sinusoidal radio frequency signal after adjustment.Second electrical power amplifier, for carrying out power amplification to the described right wing sinusoidal radio frequency signal after described phase-shifter adjustment, is input to described phase-modulator by the described right wing sinusoidal radio frequency signal after power amplification.Electroabsorption Modulated Laser, for producing light signal under the driving of the described left sinusoidal radio frequency signal of first electrical power amplifier output, and is input to described phase-modulator by the described light signal produced.Described phase-modulator, under the driving of the described right wing sinusoidal radio frequency signal of second electrical power amplifier output, modulates the described light signal of input, produces Frequency Locking and orthogonal multicarrier.
In an Alternate embodiments of the embodiment of the present invention, as shown in Figure 1, orthogonal multiple carrier light source can also comprise 2 frequency multipliers, be connected between described phase-shifter and second electrical power amplifier, right wing sinusoidal radio frequency signal is first through described phase-shifter, then realize 2 frequencys multiplication of signal frequency through described 2 frequency multipliers, eventually pass after second electric amplifier carries out power amplification and input described phase-modulator as radio-frequency (RF) driving signal.In this alternative, the Main Function of 2 frequency multipliers realizes 2 frequencys multiplication to right wing sinusoidal radio frequency signal.Because described phase-modulator has relatively large modulation bandwidth, therefore, in the present embodiment, adopt phase-modulator described in 2 higher frequency multiplication radio frequency signals drive, adopt Electroabsorption Modulated Laser described in lower single frequency multiplication radio frequency signals drive simultaneously.To driving the radiofrequency signal of phase-modulator to carry out 2 frequency multiplication operations, contribute to increasing the number producing subcarrier further.
In an Alternate embodiments of the embodiment of the present invention, as shown in Figure 1, described Electroabsorption Modulated Laser can by distributed feed-back (DFB) laser and electroabsorption modulator (EAM) be integrated forms, alternatively, the live width of described EML is only 1.9MHz (the live width 25MHz much smaller than DML).Alternatively, the operating current of described distributed feedback laser need be greater than the threshold current of distributed feedback laser, and Electroabsorption Modulated Laser operating current is provided by a DC power supply (DC); The light signal that described distributed feedback laser exports injects the described electroabsorption modulator by a road radio frequency signals drive and the bias voltage of described electroabsorption modulator need in the linear modulation region of electroabsorption modulator.In linear modulation range, the bias voltage improving described electroabsorption modulator will expand the optimum working zone scope of Electroabsorption Modulated Laser.But when the bias voltage of electroabsorption modulator is too high, owing to introducing larger insertion loss, the average power of Electroabsorption Modulated Laser output signal will be less than-10dBm.Now can consider the insertion loss of the integrated semiconductor optical amplifier (SOA) of employing one in order to compensating for modulator.Alternatively, the index of modulation of described Electroabsorption Modulated Laser is as given a definition: drive the radiofrequency signal amplitude of Electroabsorption Modulated Laser and the ratio of electroabsorption modulator bias voltage.Under the prerequisite that bias voltage is certain, the radiofrequency signal amplitude of raising driving Electroabsorption Modulated Laser can realize the adjustment to exporting sub-carrier power flatness effectively.Along with the increase of radiofrequency signal amplitude, the difference power generating subcarrier will reduce thereupon, and also namely power flatness will be improved thereupon; But the number generating subcarrier will remain unchanged.
In the Alternate embodiments of the embodiment of the present invention, described Electroabsorption Modulated Laser output optical signal inputs the described phase-modulator by another road 2 frequency multiplication radio frequency signals drive further and produces Frequency Locking and orthogonal multicarrier, and the frequency interval between multicarrier is by being 12.5GHz.Alternatively, the index of modulation of described phase-modulator is as given a definition: the ratio driving the radiofrequency signal phase and magnitude modulator half-wave voltage of phase-modulator.Under the prerequisite that half-wave voltage is certain, improve and drive the radiofrequency signal amplitude of phase-modulator can effectively realize regulating output sub-carrier number object.Along with the increase of radiofrequency signal amplitude, the number generating subcarrier will increase thereupon.Therefore, in actual applications, reply drives the radiofrequency signal amplitude of Electroabsorption Modulated Laser and phase-modulator to carry out reasonable adjusting, to produce the many as far as possible and multicarrier that power flatness is good.Therefore, alternatively, described phase-modulator is also for increasing by increasing the radiofrequency signal amplitude driving described phase-modulator the orthogonal sub-carriers number generated.Described Electroabsorption Modulated Laser is also for driving the radiofrequency signal amplitude of described Electroabsorption Modulated Laser to make the amplitude of the subcarrier of generation smooth by regulating.
Below in conjunction with accompanying drawing 1, to comprise the orthogonal multiple carrier light source of Electroabsorption Modulated Laser, phase-modulator, sinusoidal radio frequency signal source, power divider, phase-shifter, 2 frequency multipliers and electric amplifier, the multicarrier in the technical scheme provide embodiment of the present invention generates and is described in detail.
First, described sinusoidal radio frequency signal source is the sinusoidal radio frequency signal of 12.5GHz to described power divider output signal frequency.
Secondly, above radiofrequency signal is divided into two-way by described power divider: wherein the single frequency multiplication radiofrequency signal in a road carries out Electroabsorption Modulated Laser described in power amplification rear drive through described electric amplifier; Another road, first through described phase-shifter, then realizes 2 frequencys multiplication of signal frequency through described 2 frequency multipliers, finally this 2 frequency multiplication radiofrequency signal carries out phase-modulator described in power amplification rear drive through described electric amplifier.
The phase-shifter Main Function that above-mentioned Article 2 branch road adopts is realize two-way radiofrequency signal synchronous.
Described Electroabsorption Modulated Laser is by a distributed feedback laser and electroabsorption modulator is integrated forms.A DC power supply is provided as described distributed feedback laser provides operating current.Preferably, this operating current need be greater than the threshold current of laser.
Again, the described electroabsorption modulator by the single frequency multiplication radio frequency signals drive in a road of light signal input that described distributed feedback laser exports carries out light modulation and the bias voltage of described electroabsorption modulator need in the linear modulation region of device.
Then, the light signal that described electroabsorption modulator exports inputs the erbium-doped fiber amplifier of a polarization maintenance further in order to compensate the modulation loss introduced by described electroabsorption modulator.
Subsequently, the light signal through power amplification that the erbium-doped fiber amplifier that described polarization keeps exports inputs the described phase-modulator by another road 2 frequency multiplication radio frequency signals drive further, produce Frequency Locking and orthogonal multicarrier, the electrical domain expression formula of its output signal is as follows:
E out 2 ( t ) ≈ E 0 [ 1 + R 1 sin ( 2 π f s t ) ] exp ( j 2 π f c t ) exp [ j R 2 sin ( 4 π f s t ) ] = E 0 Σ n = - ∞ ∞ J n ( R 2 ) exp [ j 2 π ( f c + 2 n f s ) t ] - j E 0 R 1 2 Σ n = - ∞ ∞ J n ( R 2 ) exp { j 2 π [ f c + ( 2 n + 1 ) f s ] t } + j E 0 R 1 2 Σ n = - ∞ ∞ J n ( R 2 ) exp { j 2 π [ f c + ( 2 n - 1 ) f s ] t } . - - - ( 1 )
Wherein, R1 is the Electroabsorption Modulated Laser index of modulation, definition specific as follows: drive the radiofrequency signal amplitude of Electroabsorption Modulated Laser and the ratio of electroabsorption modulator bias voltage; R2 is phase modulator modulation coefficient, definition specific as follows: the ratio driving the radiofrequency signal phase and magnitude modulator half-wave voltage of phase-modulator.Known by analyzing above formula, in formula 1 second, three power not only achieved exporting multicarrier are smooth, also introduce new frequency component, make the frequency interval between adjacent sub-carrier drive 2 frequency-doubled signal frequency halvings of phase-modulator to be single frequency-doubled signal frequency by reality.
In actual applications, the electric amplifier of two branch roads as shown in Figure 1 can be regulated respectively, realize the reasonable adjusting of the 2 frequency multiplication radiofrequency signal amplitudes to the single frequency multiplication radiofrequency signal and driving phase-modulator driving Electroabsorption Modulated Laser.Experiment proves, as shown in Figure 2, the above orthogonal multiple carrier light source based on EML and PM cascade finally can export 25 and power difference is less than the Frequency Locking orthogonal multiple carrier of 5dB at phase-modulator output, and the frequency interval between subcarrier is 12.5GHz.
Alternatively, as shown in Figure 1, this orthogonal multiple carrier light source can also arrange an image intensifer (PM-EDFA) between EML and PM cascade, amplifies light signal.
According to the embodiment of the present invention, additionally provide a kind of PDM-QPSK sender unit.
Fig. 3 A is the structural representation of the PDM-QPSK sender unit according to the embodiment of the present invention, and as shown in Figure 3A, this device mainly comprises: the orthogonal multiple carrier light source be linked in sequence, photon carrier selection module, PDM-QPSK optical emitting module.
The emitter that the embodiment of the present invention provides adopts the orthogonal multiple carrier light source based on EML and PM cascade to produce multicarrier, adopts PDM-QPSK light signal generation module to generate high speed PDM-QPSK modulation signal
Respectively above-mentioned modules is described below.
The orthogonal multiple carrier light source as shown in Figure 1 that orthogonal multiple carrier light source provides for this embodiment, specifically see foregoing description, does not repeat them here.
Described photon carrier selection module, can comprise optical add/drop multiplexer (IL) and adjustable light wave-filter (PM-TOF).Alternatively, as shown in Figure 4, the adjustable light wave-filter (PM-TOF) that photon carrier selection module is kept by an a 12.5/25-GHz and polarization by an optical add/drop multiplexer (IL) forms.Optical add/drop multiplexer, is divided into odd even two parts for the multicarrier exported by described quadrature carrier light source, odd number road multicarrier or even number road multicarrier is input to adjustable light wave-filter; Described adjustable light wave-filter, for bandwidth and wavelength by regulating described adjustable light wave-filter, carries out filtering to obtain required light carrier to input multicarrier.In embodiments of the present invention, first the multicarrier exported by the orthogonal multiple carrier light source based on EML and PM cascade is divided into odd even two parts through described optical add/drop multiplexer, and the frequency interval between odd number or even number road multicarrier will be increased to 25GHz thus.Then the odd number exported by described optical add/drop multiplexer or even number road multicarrier input described polarization and keep adjustable light wave-filter, answer light carrier needed for being leached by the bandwidth and wavelength regulating described adjustable light wave-filter.
Alternatively, adjustable light wave-filter can be the Erbium-Doped Fiber Amplifier that a polarization keeps.
In embodiments of the present invention, the orthogonal multiple carrier that orthogonal multiple carrier light source produces inputs described optical add/drop multiplexer and is divided into odd even two parts.Alternatively, in order to match with radiofrequency signal source frequency 12.5GHz, described optical add/drop multiplexer device parameters is 12.5/25-GHz.Intersect the alternative adopting other add-drop multiplexer device parameters, this setting parameter can realize being separated the optimum of light multi-carrier signal.Frequency interval between described odd number or even number road multicarrier will be increased to 25GHz thus.The odd number road multi-carrier light spectrogram that described optical add/drop multiplexer exports as shown in Figure 5.Then described odd number road multicarrier is inputted described polarization and keep adjustable light wave-filter.Alternatively, the bandwidth of described adjustable light wave-filter should be consistent with required light carrier of answering with wavelength.Herein, described adjustable light wave-filter also achieves the filtering keeping Erbium-Doped Fiber Amplifier ASE noise in order to the polarization compensating electroabsorption modulator modulation loss adopted above-mentioned orthogonal multiple carrier light source simultaneously.Alternatively, the band pass filter that several centre frequencies can be adopted fixed realizes the filtering to corresponding light carrier wave, but adopts described adjustable light wave-filter on the one hand can simplied system structure, also convenient more flexibly in filter centre frequency adjustment on the other hand.The spectrogram of the required photon carrier wave that described polarization keeps adjustable light wave-filter to export as shown in Figure 6.The photon carrier wave finally keeping adjustable light wave-filter to export polarization keeps Erbium-Doped Fiber Amplifier to carry out power amplification by a polarization again, and input PDM-QPSK optical emitting module realizes QPSK optical signal modulation as optical carrier.
Described PDM-QPSK optical emitting module can comprise I/O modulator and polarization multiplexer.I/O modulator, the phase difference of upper and lower two-arm is pi/2, drives for the light carrier exported described photon carrier selection module, produces light QPSK signal; Polarization multiplexer, light QPSK signal for being exported by I/O modulator is divided into Liang Ge branch, a wherein road light signal is postponed, power equalization is carried out to another road light signal, then two ways of optical signals is merged, the palarization multiplexing of analog signal, generates PDM-QPSK light signal, described PDM-QPSK light signal is transferred to described homodyne coherent light detecting module through optical fiber link.
Alternatively, as shown in Figure 7, described PDM-QPSK optical emitting module is made up of an I/Q modulator and a polarization multiplexer.Described I/Q modulator increases Dare modulator (MZM) by two parallel Mach and form, and described Mach increasing Dare modulator is all biased in ignore and is driven in all-wave.The phase-difference control of the upper and lower two-arm of described I/Q modulator is at pi/2.The light carrier leached by described photon carrier selection module is that a road 28G baud electricity binary signal drives generation light QPSK signal via above-mentioned I/Q modulator, and described electric binary signal results from a pattern generator (PPG).Described polarization multiplexer keeps optical coupler (PM-OC) by a polarization, one section of optical delay line (DL), an optical attenuator and polarization beam combiner (PBC) composition.Described polarization keeps optical coupler first the light QPSK signal of input to be divided into Liang Ge branch, wherein a road signal is through the delay of described optical delay line simulation generation 150 symbol lengths, and another road then realizes the equilibrium to two branch road optical signal powers through described optical attenuator.Finally two ways of optical signals is merged by described polarization beam combiner, the palarization multiplexing of analog signal, generate described PDM-QPSK signal.
In the present embodiment, a road optical carrier and a road 28G baud electricity binary signal together input I/Q modulator and carry out light modulation, export QPSK modulated light signal.The pseudo-random binary sequence that described electric binary signal is 223-1 by length is formed and is produced by a pattern reflector.Preferably, described I/Q modulator increases Dare modulator by upper and lower two parallel Mach and forms and there is pi/2 phase difference, and described Mach increases Dare modulator and is all biased in ignore and is driven in all-wave.Compared with increasing the plan of establishment of Dare modulator parameter with other Mach, described setting can realize optimum zero and warble, the phase-modulation of π phase hit.
Then by the QPSK modulated light signal input polarization multiplexer that I/Q modulator exports, produce PDM-QPSK signal, described PDM-QPSK light signal is launched through optical fiber link.Described polarization multiplexer keeps optical coupler by a polarization, and one section of optical delay line, an optical attenuator becomes with a polarization beam combiner.Described polarization keeps optical coupler first to input QPSK modulated light signal and is divided into Liang Ge branch, preferably, wherein a road signal is through the delay of described optical delay line simulation generation 150 symbol lengths, and another road then realizes the equilibrium to two branch road optical signal powers through described optical attenuator.Finally two ways of optical signals is merged by described polarization beam combiner, the palarization multiplexing of analog signal.There is a kind of alternative herein, namely directly integrated light polarization multiplexer module is adopted, but described analog optical signal palarization multiplexing module comparatively has advantage on the one hand on the cost of experiment apparatus, on the other hand because can directly to regulate optical delay line therefore convenient more flexibly.The 112-Gb/s light PDM-QPSK signal generated then is transmitted into receiving terminal via optical fiber link.
According to the embodiment of the present invention, according to the embodiment of the present invention, additionally provide a kind of PDM-QPSK signal coherence optical receiver system.
Fig. 3 B is the structural representation of the PDM-QPSK signal coherence optical receiver system according to the embodiment of the present invention, and as shown in Figure 3 B, this system comprises receiving system and above-mentioned PDM-QPSK sender unit.As shown in Figure 3 B, receiving system adopts homodyne coherent light detecting module to realize coherent detection and the date restoring of local oscillator light and flashlight signal.The 112-Gb/s light PDM-QPSK signal that emitter generates then is transferred to receiving system via optical fiber link, and wherein said optical fiber link is made up of 80km standard single-mode fiber-28 (SMF-28).
Alternatively, the homodyne coherent light detecting module of receiving system can comprise: polarization diversity adds phase diversity optical coherent detection module and digital signal processing unit.Wherein, polarization diversity adds phase diversity optical coherent detection module and comprises an outside cavity gas laser, two polarization beam apparatus, two 90 ° of optical mixer units, four photodiodes, and four high-speed AD converters, wherein, described outside cavity gas laser is for serving as local oscillator light with the described PDM-QPSK light signal received respectively through a described polarization beam apparatus, described local oscillator light and described PDM-QPSK light signal are separated into two orthogonal polarization state light signals by this polarization beam apparatus, the described local oscillator light of identical polarization state and described PDM-QPSK light signal are together inputted described 90 ° of optical mixer units, described 90 ° of optical mixer units carry out beat frequency with described PDM-QPSK light signal after being used for the light signal of input to produce the phase shift of 0 °, 90 °, 180 °, 270 °, export after realizing coherent detection, described photodiode, carries out balance detection for the four road coherent detection light signals exported two described 90 ° of optical mixer units, output four road photoelectric current is input to four described high-speed AD converters respectively, described adjustment analog to digital converter, is converted into sampled signal for carrying out Nyqusit sampling to the photoelectric current of input.Described digital signal processing unit carries out date restoring to the sampled signal of high speed analog-to-digital conversion sampling gained described in each respectively.
Alternatively, as shown in Figure 8, described homodyne coherent light detecting module adds phase diversity optical coherent detection module by a polarization diversity and Digital Signal Processing (DSP) unit forms.Described polarization diversity adds phase diversity optical coherent detection module and comprises an outside cavity gas laser (ECL), two polarization beam apparatus (PBS), two 90 ° of optical mixer units, four photodiodes (PD) and four high-speed AD converter (AEC) compositions.Wherein, the effect of serving as local oscillator light source (LO) of described outside cavity gas laser and the flashlight transmitted through described optical fiber link received are separated into two orthogonal polarization states respectively through a described polarization beam apparatus; Then the local oscillator light of identical polarization state and flashlight are together inputted described 90 ° of optical mixer units, the major function of described 90 ° of optical mixer units is that then the phase shift making local oscillator light produce 0 °, 90 °, 180 °, 270 ° is carried out beat frequency with flashlight and realized coherent detection; Subsequently by four road coherent detection light signal (X polarization direction in-phase component, quadrature components of two described 90 ° of optical mixer units outputs; Y polarization direction in-phase component, quadrature component) input four described photodiodes respectively and carry out balance detection, export four road photoelectric currents and input four high-speed AD converters more respectively and carry out Nyqusit sampling and be converted into sampled signal.The major function of described digital signal processing unit realizes carrying out date restoring to the sampled signal through high speed analog-to-digital conversion sampling gained, and comprising: when signal resets, dispersion compensation, constant modulus algorithm is balanced, carrier auxiliary, differential decoding and error rate calculation.
In this Alternate embodiments, the PDM-QPSK light signal that first emitter exports inputs described polarization diversity via the transmission of 80km standard single-mode fiber-28 as Received signal strength light and adds phase diversity optical coherent detection module.Described polarization diversity adds phase diversity optical coherent detection module and comprises an outside cavity gas laser, two polarization beam apparatus, two 90 ° of optical mixer units, four photodiodes and four high-speed AD converter compositions.
Secondly the Received signal strength light of input and local oscillator light are realized being separated of two orthogonal polarization states respectively through a described polarization beam apparatus, described local oscillator light source is realized by described outside cavity gas laser.
Then the local oscillator light and flashlight with identical polarization state are together inputted described 90 ° of optical mixer units, the major function of described 90 ° of optical mixer units is that then the phase shift making local oscillator light produce 0 °, 90 °, 180 °, 270 ° is carried out beat frequency with flashlight and realized coherent detection.
Subsequently by four road coherent detection light signal (X polarization direction in-phase component, quadrature components of two described 90 ° of optical mixer units outputs; Y polarization direction in-phase component, quadrature component) respectively input four described photodiodes carry out balance detection, export four road photoelectric currents.
Last more described four road photoelectric currents inputted respectively four described high-speed AD converters and carry out Nyqusit sampling and be converted into the sampling signal of telecommunication.
Although adding phase diversity optical coherent detection by above-mentioned polarization diversity intactly can remain in the sampling signal of telecommunication after opto-electronic conversion by the amplitude of carrying in Received signal strength area of light and phase information, but because local oscillator light source and the frequency of making a start between light carrier are difficult to keep completely the same and the live width of local oscillator light source will introduce corresponding phase deviation, frequency and the phase place of the sampling signal of telecommunication will be subject to the disturbance of local oscillator light frequency and phase place.In addition, also there is other signal impairment such as channel static impairment and polarization mode dispersion effect that sending and receiving end sampling clock does not mate and causes due to optical fiber dispersion in coherent detection process.Therefore, described digital signal processing unit need be introduced and carry out respectively estimating and compensates for above loss, and then the recovery regeneration completed original transmitted signal and recovery.As shown in Figure 7, preferably, described digital signal processing unit comprises: when signal resets, dispersion compensation, and constant modulus algorithm is balanced, carrier auxiliary, differential decoding and error rate calculation.Be mainly used in solving ADC sampling clock when wherein signal resets and do not mate the clock misalignment issues caused, dispersion compensation and constant modulus algorithm equilibrium are mainly used in eliminating the damage that optical fiber dispersion and polarization mode dispersion cause signal, carrier auxiliary is mainly used in eliminating phase deviation to the impact of signal, finally carries out differential decoding to the correct signal constellation (in digital modulation) figure recovered and reverts to 0-1 bit sequence and by the overall performance of error rate calculation evaluating system.
The said system that the embodiment of the present invention provides, effectively subcarrier can will be exported owing to adopting the orthogonal multiple carrier light source based on EML and PM cascade, thus can the live width of transmitting terminal be controlled at 1.9MHz, thus ensure that the product of light carrier live width and symbol duration meets the condition (product is less than 1 × 10-4) can implemented 28G baud high speed PDM-QPSK signal coherence and receive, and makes the practicable of embodiment 3 become possibility.
As can be seen from the above description, in the embodiment of the present invention, propose a kind of orthogonal multiple carrier light source based on EML and PM cascade, and this multicarrier light source is applied to a PDM-QPSK modulation signal emitter and coherent light detection system.Some can not only be generated and the good subcarrier of flatness by this orthogonal multiple carrier light source, also effectively overcome in DML and PM concatenated schemes and generate the excessive deficiency of subcarrier live width, making to carry out coherent light reception to high speed PDM-QPSK modulation signal becomes possibility.In addition the described orthogonal multiple carrier light source that the present invention proposes also has small size, low-power consumption and feature easy of integration, having broad application prospects thus at real system.
Obviously, those skilled in the art should be understood that, above-mentioned of the present invention each module or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on network that multiple calculation element forms, alternatively, they can realize with the executable program code of calculation element, thus, they can be stored and be performed by calculation element in the storage device, and in some cases, step shown or described by can performing with the order be different from herein, or they are made into each integrated circuit modules respectively, or the multiple module in them or step are made into single integrated circuit module to realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (13)

1. an orthogonal multiple carrier light source, is characterized in that, comprising: Electroabsorption Modulated Laser, phase-modulator, sinusoidal radio frequency signal source, power divider, phase-shifter, the first electrical power amplifier, and the second electrical power amplifier, wherein,
Described sinusoidal radio frequency signal source, for exporting the sinusoidal radio frequency signal of prearranged signals frequency to described power divider;
Described power divider, for the described sinusoidal radio frequency signal of input is divided into left sinusoidal radio frequency signal and right wing sinusoidal radio frequency signal, described left sinusoidal radio frequency signal is input to described electrical power amplifier, described right wing sinusoidal radio frequency signal is input to described phase-shifter;
Described first electrical power amplifier, for carrying out power amplification to described left sinusoidal radio frequency signal, is input to described Electroabsorption Modulated Laser by the described left sinusoidal radio frequency signal after power amplification;
Described phase-shifter, for adjusting described right wing sinusoidal radio frequency signal, to make described right wing sinusoidal radio frequency signal synchronous with described left sinusoidal radio frequency signal, and exports the described right wing sinusoidal radio frequency signal after adjustment;
Described second electrical power amplifier, for carrying out power amplification to the described right wing sinusoidal radio frequency signal after described phase-shifter adjustment, is input to described phase-modulator by the described right wing sinusoidal radio frequency signal after power amplification;
Described Electroabsorption Modulated Laser, for producing light signal under the driving of the described left sinusoidal radio frequency signal of described first electrical power amplifier output, and is input to described phase-modulator by the described light signal produced;
Described phase-modulator, under the driving of the described right wing sinusoidal radio frequency signal of described second electrical power amplifier output, modulates the described light signal of input, produces Frequency Locking and orthogonal multicarrier.
2. orthogonal multiple carrier light source according to claim 1, it is characterized in that, also comprise: 2 frequency multipliers, be connected between described phase-shifter and described second electrical power amplifier, for realizing 2 frequencys multiplication of the described right wing sinusoidal radio frequency signal that described phase-shifter exports, the described right wing sinusoidal radio frequency signal after 2 frequencys multiplication is input to described second electrical power amplifier.
3. orthogonal multiple carrier light source according to claim 1, is characterized in that, described Electroabsorption Modulated Laser comprises:
Distributed feedback laser, for output optical signal;
Electroabsorption modulator, under the driving of the described left sinusoidal radio frequency signal of described first electrical power amplifier output, carries out light modulation to the described light signal that described distributed feedback laser exports, exports the light signal after modulation.
4. orthogonal multiple carrier light source according to claim 3, is characterized in that, the operating current of described distributed feedback laser is greater than the threshold current of described distributed feedback laser.
5. orthogonal multiple carrier light source according to claim 3, is characterized in that, the bias voltage of described electroabsorption modulator is in the linear modulation region of described electroabsorption modulator.
6. orthogonal multiple carrier light source according to claim 3, it is characterized in that, described Electroabsorption Modulated Laser also comprises: semiconductor optical amplifier, described light signal for exporting described electroabsorption modulator enters compensation, to compensate the insertion loss of described electroabsorption modulator, export the light signal after compensating.
7. orthogonal multiple carrier light source according to any one of claim 1 to 6, is characterized in that, the live width of described Electroabsorption Modulated Laser is 1.9MHz.
8. orthogonal multiple carrier light source according to any one of claim 1 to 6, is characterized in that, described phase-modulator is also for increasing by increasing the radiofrequency signal amplitude driving described phase-modulator the orthogonal sub-carriers number generated.
9. orthogonal multiple carrier light source according to any one of claim 1 to 6, is characterized in that, described Electroabsorption Modulated Laser is also for driving the radiofrequency signal amplitude of described Electroabsorption Modulated Laser to make the amplitude of the subcarrier of generation smooth by regulating.
10. a palarization multiplexing orthogonal phase modulation PDM-QPSK sender unit, is characterized in that, comprising: the orthogonal multiple carrier light source be linked in sequence, photon carrier selection module and PDM-QPSK optical emitting module; Wherein,
The orthogonal multiple carrier light source of described orthogonal multiple carrier light source according to any one of claim 1 to 9;
Described photon carrier selection module comprises:
Optical add/drop multiplexer, is divided into odd even two parts for the multicarrier exported by described quadrature carrier light source, odd number road multicarrier or even number road multicarrier is input to adjustable light wave-filter;
Described adjustable light wave-filter, for bandwidth and wavelength by regulating described adjustable light wave-filter, carries out filtering to obtain required light carrier to input multicarrier;
Described PDM-QPSK optical emitting module, comprising:
I/Q modulator, the phase difference of upper and lower two-arm is pi/2, under the light carrier for exporting at described photon carrier selection module driving, producing and exporting light QPSK signal;
Polarization multiplexer, light QPSK signal for being exported by I/Q modulator is divided into Liang Ge branch, a wherein road light signal is postponed, power equalization is carried out to another road light signal, then two ways of optical signals is merged, the palarization multiplexing of analog signal, generates the final PDM-QPSK light signal for launching.
11. devices according to claim 10, is characterized in that, described optical add/drop multiplexer is frequency is 12.5/25-GHz.
12. devices according to claim 10, is characterized in that, described polarization multiplexer comprises:
A polarization keeps optical coupler, one section of optical delay line, an optical attenuator and polarization beam combiner, wherein, described polarization keeps optical coupler to be used for the QPSK light signal of input to be divided into Liang Ge branch, wherein a road signal inputs to described optical delay line, and another road then inputs to described optical attenuator;
Described optical delay line, for being produced the delay of 150 symbol lengths by the QPSK light signal of simulation to input, inputs to described polarization beam combiner by the QPSK light signal after postponing;
Described optical attenuator, the power of the QPSK light signal of Yong Yu Dui Ying adjusts, and realizes the equilibrium to QPSK optical signal power described in two branch roads, and the QPSK light signal after adjustment is inputed to described polarization beam combiner;
Described polarization beam combiner, for input two ways of optical signals by merging, the palarization multiplexing of analog signal, generates described PDM-QPSK signal.
13. 1 kinds of palarization multiplexing orthogonal phase modulation PDM-QPSK signal coherence optical receiver systems, it is characterized in that, comprise: the emitter according to any one of receiving system and 10 to 12, wherein, the PDM-QPSK signal that described receiving system sends for receiving described emitter.
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