CN105099570B - Orthogonal multiple carrier light source and PDM-QPSK sender units - Google Patents
Orthogonal multiple carrier light source and PDM-QPSK sender units Download PDFInfo
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- CN105099570B CN105099570B CN201410218720.5A CN201410218720A CN105099570B CN 105099570 B CN105099570 B CN 105099570B CN 201410218720 A CN201410218720 A CN 201410218720A CN 105099570 B CN105099570 B CN 105099570B
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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]
Abstract
The invention discloses a kind of orthogonal multiple carrier light source and PDM QPSK sender units.Wherein, the orthogonal multiple carrier light source includes：Sinusoidal radio frequency signal source, for exporting the sinusoidal radio frequency signal of prearranged signals frequency to power divider；Power divider, for the sinusoidal radio frequency signal of input to be divided into left sinusoidal radio frequency signal and right wing sinusoidal radio frequency signal；First electrical power amplifier, for carrying out power amplification to left sinusoidal radio frequency signal；Phase-shifter, for being adjusted to right wing sinusoidal radio frequency signal；Second electrical power amplifier, for carrying out power amplification to the right wing sinusoidal radio frequency signal after phase-shifter adjusts；Electroabsorption Modulated Laser, for generating optical signal under the driving for the left sinusoidal radio frequency signal that the first electrical power amplifier exports；Phase-modulator generates Frequency Locking and orthogonal multicarrier under the driving for the right wing sinusoidal radio frequency signal that the second electrical power amplifier exports, being modulated to the optical signal of input.
Description
Technical field light
The present invention relates to coherent communication fields, orthogonal in particular to a kind of orthogonal multiple carrier light source and palarization multiplexing
Phase-modulation (Polarization division multiplexed quadrature phase shift keying, PDM-
QPSK) sender unit.
Background technology
In optical communication field, it is widely applied Frequency Locking and the flat orthogonal multiple carrier generation technology of power, the skill
Art can be used in Microwave photonics, all-optical signal processing, the generation of light random waveform and wavelength-division multiplex (WDM) ultra broadband light source
Deng.Especially when multicarrier is concerned with ultra broadband light source as WDM, orthogonal multiple carrier generation technology is considered as the following Tbit/s
One crucial enabling tool of optic communication.
The main technical schemes in terms of orthogonal multiple carrier generation technology include at present：(1) it is based on phase-modulator (PM)
With the concatenated schemes of intensity modulator (IM)；(2) concatenated schemes driven based on phase-modulator and its frequency multiplication；(3) it is based on I/Q
The generation scheme of modulator；(4) the loop multicarrier based on phase-modulation generates scheme；(5) I/Q modulator and frequency displacement ring are based on
The generation scheme etc. that road (RFS) combines.The above scheme energy orthogonal overloading that generation wavelength is adjustable, Frequency Locking and power are flat
Wave, but with high insertion loss and high-cost deficiency.
In the related art, it is also proposed that one kind is based on direct modulated laser device with distributed feedback (DML) and phase-modulator
Cascade multicarrier generates scheme, though the program can effectively overcome the shortcomings of that above five kinds of schemes are of high cost and simple with structure
Single feature, but the subcarrier that the program generates has relatively wide line width (about 25MHz), thus it is only used for modulate intensity
Modulated optical signal, difference is for modulating PDM-QPSK modulated signals.
However, compared with direct detection intensity-modulated signal, coherent detection PDM-QPSK modulated signals have higher frequency
Spectrum efficiency and application also increasingly extensively.It is thus orthogonal in the relevant optical detection system of PDM-QPSK modulated signals for can apply to
Multicarrier generation technology is particularly important.
For in the related technology when leading to the problem of PDM-QPSK modulated signals existing high insertion loss with it is high-cost,
Currently no effective solution has been proposed.
Invention content
For in the related technology when leading to the problem of PDM-QPSK modulated signals existing high insertion loss with it is high-cost,
The present invention provides a kind of orthogonal multiple carrier light source and PDM-QPSK sender units, at least to solve the above problems.
According to an aspect of the invention, there is provided a kind of orthogonal multiple carrier light source, including：Electroabsorption Modulated Laser,
Phase-modulator, sinusoidal radio frequency signal source, power divider, phase-shifter, the first electrical power amplifier and the second electrical power are put
Big device, wherein；The sinusoidal radio frequency signal source, for exporting the sinusoidal radio frequency signal of prearranged signals frequency to the power distribution
Device；The power divider, for the sinusoidal radio frequency signal of input to be divided into left sinusoidal radio frequency signal and right wing sine
The left sinusoidal radio frequency signal is input to the electrical power amplifier by radiofrequency signal, by the right wing sinusoidal radio frequency signal
It is input to the phase-shifter；First electrical power amplifier, for carrying out power amplification to the left sinusoidal radio frequency signal,
The left sinusoidal radio frequency signal after power amplification is input to the Electroabsorption Modulated Laser；The phase-shifter, is used for
The right wing sinusoidal radio frequency signal is adjusted, so that the right wing sinusoidal radio frequency signal is the same as the left sinusoidal radio frequency signal
It is synchronous, and the right wing sinusoidal radio frequency signal after output adjustment；Second electrical power amplifier, for through the phase shift
The right wing sinusoidal radio frequency signal after device adjustment carries out power amplification, by the right wing sinusoidal radio frequency signal after power amplification
It is input to the phase-modulator；The Electroabsorption Modulated Laser, the institute for being exported in first electrical power amplifier
It states and generates optical signal under the driving of left sinusoidal radio frequency signal, and the optical signal of generation is input to the phase-modulation
Device；The phase-modulator, the driving of the right wing sinusoidal radio frequency signal for being exported in second electrical power amplifier
Under, the optical signal of input is modulated, generates Frequency Locking and orthogonal multicarrier.
Optionally, further include：2 frequency multipliers are connected between the phase-shifter and second electrical power amplifier, are used for
2 frequencys multiplication for realizing the right wing sinusoidal radio frequency signal of the phase-shifter output, the right wing sinusoidal radio frequency after 2 frequencys multiplication is believed
Number it is input to second electrical power amplifier.
Optionally, the Electroabsorption Modulated Laser includes：Distributed feedback laser, for exporting optical signal；Electric absorption
Modulator is used under the driving for the left sinusoidal radio frequency signal that first electrical power amplifier exports, to described point
The optical signal of cloth feedback laser output carries out light modulation, exports modulated optical signal.
Optionally, the operating current of the distributed feedback laser is more than the threshold current of the distributed feedback laser.
Optionally, the bias voltage of the electroabsorption modulator is in the linear modulation region of the electroabsorption modulator.
Optionally, the Electroabsorption Modulated Laser further includes：Semiconductor optical amplifier, for the electro-absorption modulation
The optical signal of device output, to compensate the insertion loss of the electroabsorption modulator, exports after compensating into compensation is advanced into
Optical signal.
Optionally, the line width of the Electroabsorption Modulated Laser is 1.9MHz.
Optionally, the phase-modulator is additionally operable to drive the radio frequency signal amplitude of the phase-modulator to increase by increasing
Add the orthogonal sub-carriers number of generation.
Optionally, the Electroabsorption Modulated Laser is additionally operable to drive penetrating for the Electroabsorption Modulated Laser by adjusting
Frequency signal amplitude keeps the amplitude of the subcarrier of generation flat.
According to another aspect of the present invention, a kind of palarization multiplexing orthogonal phase modulation PDM-QPSK signals hair is additionally provided
Injection device, including：Orthogonal multiple carrier light source, photon carrier selection module and the PDM-QPSK optical signal launch being linked in sequence
Module；Wherein, the orthogonal multiple carrier light source is above-mentioned orthogonal multiple carrier light source；The photon carrier selection module includes：
Optical add/drop multiplexer, for the multicarrier of the quadrature carrier light source output to be divided into odd even two parts, by odd number road multicarrier
Or even number road multicarrier is input to adjustable light wave-filter；The adjustable light wave-filter, for described tunable by adjusting
The bandwidth and wavelength of optical filter are filtered to obtain required light carrier input multicarrier；The PDM-QPSK light letter
Number transmitting module, including：The phase difference of I/Q modulators, upper and lower two-arm is pi/2, for defeated in the photon carrier selection module
Under the light carrier driving gone out, simultaneously output light QPSK signals are generated；Polarization multiplexer, the light QPSK for exporting I/Q modulators
Signal is divided into Liang Ge branches, to wherein optical signal postpones all the way, power equalization is carried out to another way optical signal, then by two
Road optical signal merges, the palarization multiplexing of analog signal, generates PDM-QPSK optical signals, and the PDM-QPSK optical signals are passed through
Optical fiber link emits.
Optionally, it is 12.5/25-GHz that the optical add/drop multiplexer, which is frequency,.
Optionally, the polarization multiplexer includes：One polarization keeps photo-coupler, one section of optical delay line, a light decay
Subtract device and a polarization beam combiner, wherein the polarization keeps photo-coupler to be used to the QPSK optical signals of input being divided into two
Branch, wherein signal is input to the optical delay line all the way, another way is then input to the optical attenuator；The optical delay line,
Delay for generating 150 symbol lengths to the QPSK optical signals of input by simulating, the QPSK optical signals after delay is defeated
Enter to the polarization beam combiner；The optical attenuator is adjusted Yong the power of the QPSK optical signals of Yu Dui Ying, is realized to two
QPSK optical signals after adjustment are input to the polarization beam combiner by the equilibrium of QPSK optical signal powers described in road；The polarization
Bundling device, for the two ways of optical signals to input by merging, the palarization multiplexing of analog signal generates the PDM-QPSK
Signal.
Through the invention, using cascade orthogonal more with phase-modulator (PM) based on Electroabsorption Modulated Laser (EML)
Carrier wave light source can not only generate certain amount and the good subcarrier of flatness, also effectively overcome DML and PM concatenated schemes
It is middle to generate the excessive deficiency of subcarrier line width, so as to carry out relevant light-receiving to high speed PDM-QPSK modulated signals.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the structural schematic diagram according to the orthogonal multiple carrier light source of the embodiment of the present invention；
Fig. 2 is the schematic diagram according to the spectrum of orthogonal multiple carrier light source output of the embodiment of the present invention；
Fig. 3 A are the structural schematic diagram according to the PDM-QPSK sender units of the embodiment of the present invention；
Fig. 3 B are the structural schematic diagram according to the PDM-QPSK signal coherence optical receiver systems of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram according to the photon carrier selection module of the embodiment of the present invention；
Fig. 5 is that the odd number road of the optical add/drop multiplexer output of the photon carrier selection module used in the embodiment of the present invention is more
The spectrogram of carrier wave；
Fig. 6 is that the photon carrier selection module polarization used in the embodiment of the present invention keeps adjustable light wave-filter output
The spectrogram of required photon carrier wave；
Fig. 7 is the structural schematic diagram according to the PDM-QPSK optical emitting modules in the embodiment of the present invention；
Fig. 8 is the structural schematic diagram according to the homodyne coherent light detecting module of the embodiment of the present invention.
Specific implementation mode
Come that the present invention will be described in detail below with reference to attached drawing and in conjunction with the embodiments.It should be noted that not conflicting
In the case of, the features in the embodiments and the embodiments of the present application can be combined with each other.
According to embodiments of the present invention, a kind of orthogonal multiple carrier light source is provided.
Fig. 1 is according to the structural schematic diagram of the orthogonal multiple carrier light source of the embodiment of the present invention, as shown in Figure 1, this is orthogonal more
Carrier wave light source includes mainly：Electroabsorption Modulated Laser (EML), phase-modulator (PM), sinusoidal radio frequency signal source, power distribution
Device, phase-shifter (PS) and 2 electrical power amplifiers (EA).
Wherein, the sinusoidal radio frequency signal source be used for power divider output prearranged signals frequency (for example,
Sinusoidal radio frequency signal 12.5GHz).The power divider is used to the sinusoidal radio frequency signal of input being divided into left and right two-way, will
Left signal is input to first electrical power amplifier (EA), and right wing signal is input to the phase-shifter.First electrical power is put
Big device carries out power amplification, using the signal after power amplification as penetrating to the left sinusoidal radio frequency signal of power divider output
Frequency drive signal inputs the Electroabsorption Modulated Laser (EML).In embodiments of the present invention, the electrical power amplifier is main
Effect is that left sinusoidal radio frequency signal carries out power amplification, therefore, by rationally adjusting the left exported through electrical power amplifier
Radio frequency signal amplitude can generate suitable number of sub carrier wave and flatness.The phase-shifter is to the right wing sinusoidal radio frequency signal
It is adjusted, so that the right wing sinusoidal radio frequency signal is synchronized with the left sinusoidal radio frequency signal, and the institute after output adjustment
State right wing sinusoidal radio frequency signal.Second electrical power amplifier, for sinusoidal to the right wing after phase-shifter adjustment
Radiofrequency signal carries out power amplification, and the right wing sinusoidal radio frequency signal after power amplification is input to the phase-modulator.
Electroabsorption Modulated Laser, for being produced under the driving for the left sinusoidal radio frequency signal that first electrical power amplifier exports
Third contact of a total solar or lunar eclipse signal, and the optical signal of generation is input to the phase-modulator.The phase-modulator, at second
Under the driving of the right wing sinusoidal radio frequency signal of electrical power amplifier output, the optical signal of input is modulated, is produced
Raw Frequency Locking and orthogonal multicarrier.
In an optional embodiment of the embodiment of the present invention, as shown in Figure 1, orthogonal multiple carrier light source can also include
2 frequency multipliers are connected between the phase-shifter and second electrical power amplifier, and right wing sinusoidal radio frequency signal first passes around described
Phase-shifter, is then passed through 2 frequencys multiplication that 2 frequency multiplier realizes signal frequency, finally passes through second electric amplifier and carries out power
After amplification the phase-modulator is inputted as RF driving signal.In the optional embodiment, the main function of 2 frequency multipliers
It is 2 frequencys multiplication realized to right wing sinusoidal radio frequency signal.Since the phase-modulator has relatively large modulation bandwidth, because
This, in the present embodiment, using phase-modulator described in higher 2 frequency multiplication radio frequency signals drive, while using lower list times
Electroabsorption Modulated Laser described in frequency radio frequency signals drive.2 frequency multiplication operations are carried out to the radiofrequency signal for driving phase-modulator, are had
Help further increase the number for generating subcarrier.
In an optional embodiment of the embodiment of the present invention, as shown in Figure 1, the Electroabsorption Modulated Laser can be with
It is integrated and is formed by distributed feed-back (DFB) laser and an electroabsorption modulator (EAM), optionally, the line width of the EML
Only 1.9MHz (the line width 25MHz for being much smaller than DML).Optionally, the operating current of the distributed feedback laser need to be more than and divide
The threshold current of cloth feedback laser, Electroabsorption Modulated Laser operating current are provided by a DC power supply (DC)；Described point
Electroabsorption modulator by radio frequency signals drive all the way and the electric absorption described in the optical signal injection of cloth feedback laser output
The bias voltage of modulator need to be in the linear modulation region of electroabsorption modulator.In linear modulation range, the electricity is improved
The bias voltage of Absorption modulation device will be enlarged by the optimum working zone range of Electroabsorption Modulated Laser.However work as electro-absorption modulation
When the bias voltage of device is excessively high, due to introducing larger insertion loss, the average work(of Electroabsorption Modulated Laser output signal
Rate will be less than -10dBm.At this time it is contemplated that using an integrated semiconductor optical amplifier (SOA) to the slotting of Compensation Modulation device
Enter loss.Optionally, the index of modulation of the Electroabsorption Modulated Laser is such as given a definition：Driving Electroabsorption Modulated Laser is penetrated
The ratio between frequency signal amplitude and electroabsorption modulator bias voltage.Under the premise of bias voltage is certain, driving electric absorption tune is improved
The radio frequency signal amplitude of laser processed can effectively realize the adjusting to exporting sub-carrier power flatness.With radiofrequency signal width
The increase of degree, generating the difference power of subcarrier will be reduced namely power flatness will improve therewith therewith；However generate subcarrier
Number will remain unchanged.
In the optional embodiment of the embodiment of the present invention, the Electroabsorption Modulated Laser output optical signal is further defeated
Enter the phase-modulator by 2 frequency multiplication radio frequency signals drive of another way and generates Frequency Locking and orthogonal multicarrier, multicarrier
Between frequency interval by for 12.5GHz.Optionally, the index of modulation of the phase-modulator is such as given a definition：Drive phase-modulation
The ratio between radio frequency signal amplitude and half-wave voltage of phase modulator of device.Under the premise of half-wave voltage is certain, driving phase is improved
The radio frequency signal amplitude of modulator, which can effectively realize, adjusts output sub-carrier number purpose.With the increasing of radio frequency signal amplitude
Add, generating the number of subcarrier will increase therewith.Therefore, in practical applications, reply driving Electroabsorption Modulated Laser and phase
The radio frequency signal amplitude of position modulator is rationally adjusted, to generate as the more as possible and good multicarrier of power flatness.Cause
This, optionally, the phase-modulator is additionally operable to drive the radio frequency signal amplitude of the phase-modulator to increase life by increasing
At orthogonal sub-carriers number.The Electroabsorption Modulated Laser is additionally operable to drive the Electroabsorption Modulated Laser by adjusting
Radio frequency signal amplitude keep the amplitude of the subcarrier of generation flat.
Below in conjunction with attached drawing 1, to include Electroabsorption Modulated Laser, phase-modulator, sinusoidal radio frequency signal source, power
Distributor, phase-shifter, 2 frequency multipliers and electric amplifier orthogonal multiple carrier light source for, alternative embodiment of the present invention is provided
Technical solution in multicarrier generation be described in detail.
First, the sinusoidal radio frequency signal source is penetrated to the sine that the power divider output signal frequency is 12.5GHz
Frequency signal.
Secondly, the above radiofrequency signal is divided into two-way by the power divider：Wherein single frequency multiplication radiofrequency signal is passed through all the way
The electric amplifier drives the Electroabsorption Modulated Laser after carrying out power amplification；Another way first passes around the phase-shifter,
Be then passed through 2 frequencys multiplication that 2 frequency multiplier realizes signal frequency, finally the 2 frequency multiplication radiofrequency signal by the electric amplifier into
The phase-modulator is driven after row power amplification.
Phase-shifter main function used by above-mentioned Article 2 branch is the synchronization for realizing two-way radiofrequency signal.
The Electroabsorption Modulated Laser is integrated and is formed by a distributed feedback laser and an electroabsorption modulator.One
A DC power supply is provided as the distributed feedback laser and provides operating current.Preferably, which need to be more than laser
Threshold current.
Again, by single frequency multiplication radio frequency signals drive all the way described in the optical signal input of the distributed feedback laser output
Electroabsorption modulator carries out light modulation and the bias voltage of the electroabsorption modulator need to be in the linear modulation region of device.
Then, the optical signal of the electroabsorption modulator output Erbium-doped fiber amplifier that further one polarization of input is kept
Device is compensating the modulation loss introduced by the electroabsorption modulator.
Then, the optical signal through power amplification for the erbium-doped fiber amplifier output that the polarization is kept further inputs institute
It states by the phase-modulator of 2 frequency multiplication radio frequency signals drive of another way, generates Frequency Locking and orthogonal multicarrier, output signal
Electrical domain expression formula it is as follows：
Wherein, R1 is the Electroabsorption Modulated Laser index of modulation, definition specific as follows：Drive Electroabsorption Modulated Laser
The ratio between radio frequency signal amplitude and electroabsorption modulator bias voltage；R2 is phase modulator modulation coefficient, definition specific as follows：It drives
The ratio between radio frequency signal amplitude and half-wave voltage of phase modulator of dynamic phase-modulator.By analyze above formula it is found that in formula 1 the
Two, three not only realize to export multicarrier power it is flat, also introduce new frequency component so that between adjacent sub-carrier
Frequency interval is single frequency-doubled signal frequency by actually driving 2 frequency-doubled signal frequency halvings of phase-modulator.
In practical applications, the electric amplifier of two branches as shown in Fig. 1 can be adjusted respectively, realized to driving electric absorption
Modulate the reasonable adjusting of single frequency multiplication radiofrequency signal of laser and 2 frequency multiplication radio frequency signal amplitudes of driving phase-modulator.Experiment
It proves, it is as shown in Fig. 2, above to be based on EML with the cascade orthogonal multiple carrier light sources of PM in the final energy of phase-modulator output end
Output 25 and power difference are less than the Frequency Locking orthogonal multiple carrier of 5dB, and the frequency interval between subcarrier is 12.5GHz.
Optionally, as shown in Figure 1, the orthogonal multiple carrier light source one light of setting can also be put between EML and PM cascades
Big device (PM-EDFA), is amplified optical signal.
According to embodiments of the present invention, a kind of PDM-QPSK sender units are additionally provided.
Fig. 3 A are the structural schematic diagram according to the PDM-QPSK sender units of the embodiment of the present invention, as shown in Figure 3A,
The device mainly includes：Orthogonal multiple carrier light source, photon carrier selection module, the PDM-QPSK optical signal launch moulds being linked in sequence
Block.
Emitter provided in an embodiment of the present invention is used generates overloading based on the cascade orthogonal multiple carrier light sources of EML and PM
Wave generates high speed PDM-QPSK modulated signals using PDM-QPSK optical signal generation modules
Above-mentioned modules are illustrated separately below.
Orthogonal multiple carrier light source is the orthogonal multiple carrier light source as shown in Figure 1 that this hair embodiment provides, referring specifically to upper
Description is stated, details are not described herein.
The photon carrier selection module may include optical add/drop multiplexer (IL) and adjustable light wave-filter (PM-
TOF).Optionally, as shown in figure 4, photon carrier selection module by an optical add/drop multiplexer (IL) by a 12.5/25-GHz
Adjustable light wave-filter (PM-TOF) composition kept with a polarization.Optical add/drop multiplexer is used for the quadrature carrier light
The multicarrier of source output is divided into odd even two parts, and odd number road multicarrier or even number road multicarrier are input to tunable optical filtering
Device；The adjustable light wave-filter, for the bandwidth and wavelength by adjusting the adjustable light wave-filter, to inputting multicarrier
It is filtered to obtain required light carrier.In embodiments of the present invention, by being based on EML and the cascade orthogonal multiple carrier light sources of PM
The multicarrier of output first passes around the optical add/drop multiplexer and is divided into odd even two parts, the frequency between odd number or even number road multicarrier
Thus interval will increase to 25GHz.Then described in odd number or even number road the multicarrier input optical add/drop multiplexer exported
Polarization keeps adjustable light wave-filter, by adjust the bandwidth of the adjustable light wave-filter and wavelength filter out needed for should light carry
Wave.
Optionally, adjustable light wave-filter can be the EDFA Erbium-Doped Fiber Amplifier that a polarization is kept.
In embodiments of the present invention, the orthogonal multiple carrier that orthogonal multiple carrier light source generates inputs the optical add/drop multiplexer point
For odd even two parts.Optionally, in order to match with radiofrequency signal source frequency 12.5GHz, the optical add/drop multiplexer device ginseng
Number is 12.5/25-GHz.Intersection uses the alternative of other add-drop multiplexer device parameters, the parameter setting that can realize to light
The optimal separation of multi-carrier signal.Thus frequency interval between the odd number or even number road multicarrier will increase to 25GHz.Institute
The odd number road multi-carrier light spectrogram for stating optical add/drop multiplexer output is as shown in Fig. 5.Then odd number road multicarrier is inputted
The polarization keeps adjustable light wave-filter.Optionally, the bandwidth of the adjustable light wave-filter should answer light with wavelength with required
Carrier wave is consistent.Herein, the adjustable light wave-filter also simultaneously realize to above-mentioned orthogonal multiple carrier light source use to
The polarization of compensation electroabsorption modulator modulation loss keeps filtering out for EDFA Erbium-Doped Fiber Amplifier ASE noises.It is alternatively possible to using
The fixed bandpass filter of several centre frequencies realizes the filtering to corresponding light carrier, but uses the adjustable light wave-filter
On the one hand can simplied system structure, it is on the other hand also more flexible convenient in terms of filter centre frequency adjusting.The polarization is protected
The spectrogram for holding the required photon carrier wave of adjustable light wave-filter output is as shown in Fig. 6.Polarization is finally kept into tunable optical
The photon carrier wave of filter output keeps EDFA Erbium-Doped Fiber Amplifier to carry out power amplification by a polarization again, inputs PDM-QPSK
Optical emitting module realizes QPSK optical signal modulations as optical carrier.
The PDM-QPSK optical emitting modules may include I/O modulators and polarization multiplexer.I/O modulators, on
The phase difference of lower two-arm is pi/2, and the light carrier for being exported to the photon carrier selection module drives, and generates light QPSK
Signal；Polarization multiplexer, the light QPSK signals for exporting I/O modulators are divided into Liang Ge branches, to wherein optical signal all the way
Postponed, power equalization is carried out to another way optical signal, then merges two ways of optical signals, the polarization of analog signal is multiple
With the PDM-QPSK optical signals are transferred to the relevant optical detection of the homodyne by generation PDM-QPSK optical signals through optical fiber link
Module.
Optionally, as shown in fig. 7, the PDM-QPSK optical emitting modules are polarized by an I/Q modulator and one
Multiplexer forms.The I/Q modulators increase Dare modulator (MZM) by two parallel Mach and form, and the Mach increases moral
You are biased in null point and are driven in all-wave modulator.The phase-difference control of two-arm is in pi/2 above and below the I/Q modulators.By
The light carrier that the photon carrier selection module filters out drives via above-mentioned I/Q modulators for 28G bauds electricity binary signal all the way
Movable property third contact of a total solar or lunar eclipse QPSK signals, and the electric binary signal results from a pattern generator (PPG).The polarization multiplexer
Photo-coupler (PM-OC), one section of optical delay line (DL), an optical attenuator and a polarization beam combiner are kept by a polarization
(PBC) it forms.The polarization keeps photo-coupler that the light QPSK signals of input are divided into Liang Ge branches first, wherein signal all the way
The delay for generating 150 symbol lengths is simulated by the optical delay line, another way is then realized by the optical attenuator to two
The equilibrium of branch optical signal power.Finally two ways of optical signals is merged by the polarization beam combiner, analog signal it is inclined
It shakes multiplexing, generates the PDM-QPSK signals.
In the present embodiment, optical carrier and 28G bauds electricity binary signal inputs I/Q modulators together all the way all the way
Light modulation is carried out, QPSK modulated optical signals are exported.The electricity binary signal is by the pseudo-random binary sequence that length is 223-1
It forms and is generated by a pattern transmitter.Preferably, the I/Q modulators increase Dare tune by upper and lower two parallel Mach
It is poor that device processed forms and there are pi/2 phases, and the Mach increases Dare modulator and is biased in null point and is driven in all-wave.With it is other
Mach increases the Dare modulator parameter plan of establishment and compares, and the setting can realize zero optimal chirp, the phase tune of π phase hits
System.
Then QPSK modulated optical signal input polarization multiplexers I/Q modulators exported generate PDM-QPSK signals, will
The PDM-QPSK optical signals emit through optical fiber link.The polarization multiplexer keeps photo-coupler, one section of light by a polarization
Delay line, an optical attenuator and a polarization beam combiner at.The polarization keeps photo-coupler to input QPSK modulation lights first
Signal is divided into Liang Ge branches, it is preferable that wherein signal simulates prolonging for 150 symbol lengths of generation by the optical delay line all the way
Late, another way then realizes the equilibrium to two branch optical signal powers by the optical attenuator.Finally two ways of optical signals is passed through
The polarization beam combiner merges, the palarization multiplexing of analog signal.Where there is a kind of alternatives, i.e., directly using integrated
Light polarization multiplexer module, but the analog optical signal palarization multiplexing module on the one hand relatively have in the cost of experiment apparatus it is excellent
Gesture, on the other hand because that directly optical delay line can be adjusted therefore more flexible convenient.The 112-Gb/s light PDM-QPSK of generation
Signal is then emitted to receiving terminal via optical fiber link.
According to embodiments of the present invention, according to embodiments of the present invention, a kind of PDM-QPSK signal coherences light-receiving is additionally provided
System.
Fig. 3 B are according to the structural schematic diagram of the PDM-QPSK signal coherence optical receiver systems of the embodiment of the present invention, such as Fig. 3 B
Shown, which includes reception device and above-mentioned PDM-QPSK sender units.As shown in Figure 3B, reception device uses zero
Poor coherent light detecting module realizes that local oscillator light and the coherent detection of signal optical signal restore with data.The 112- that emitter generates
Gb/s light PDM-QPSK signals are then transferred to reception device via optical fiber link, wherein the optical fiber link is by 80km standard lists
Mode fiber -28 (SMF-28) forms.
Optionally, the homodyne coherent light detecting module of reception device may include：Polarization diversity adds phase diversity light relevant
Detecting module and digital signal processing unit.Wherein, polarization diversity adds phase diversity optical coherent detection module to include an exocoel
Laser, two polarization beam apparatus, two 90 ° of optical mixer units, four photodiodes and four high-speed AD converters,
Wherein, the PDM-QPSK optical signals that the outside cavity gas laser is used to serve as local oscillator light and receive pass through respectively described in one
The local oscillator light and the PDM-QPSK optical signals are separated into two orthogonal polarization states by polarization beam apparatus, the polarization beam apparatus
The local oscillator light of identical polarization state and the PDM-QPSK optical signals are inputted 90 ° of photomixing by optical signal together
Device；0 ° of optical signal generation that 90 ° of optical mixer units are used to input, 90 °, 180 °, after 270 ° of phase shift with the PDM-
QPSK optical signals carry out beat frequency, are exported after realizing coherent detection；The photodiode is used for 90 ° of photomixing described to two
Four road coherent detection optical signals of device output are balanced detection, and four road photoelectric currents of output are separately input to four high speeds
Analog-digital converter；The adjustment analog-digital converter carries out Nyqusit samplings for the photoelectric current to input and is converted into sampling letter
Number.It is extensive that the digital signal processing unit carries out data to the sampled signal of each high speed analog-to-digital conversion sampling gained respectively
It is multiple.
Optionally, as shown in figure 8, the homodyne coherent light detecting module adds phase diversity light to be concerned with by a polarization diversity
Detecting module and Digital Signal Processing (DSP) unit composition.The polarization diversity adds phase diversity optical coherent detection module
Including 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 converters (AEC) form.Wherein, the outside cavity gas laser serves as the effect of local oscillator light source (LO)
With the signal light transmitted through the optical fiber link that receives respectively by a polarization beam apparatus be separated into two it is orthogonal
Polarization state；Then the local oscillator light and signal light of identical polarization state are inputted into 90 ° of optical mixer unit together, described 90 °
The major function of optical mixer unit be make local oscillator light generate 0 °, 90 °, 180 °, then 270 ° of phase shift carries out beat frequency with signal light real
Existing coherent detection；Then by four road coherent detection optical signals of two 90 ° of optical mixer units output, (polarization directions X are the same as phase point
Amount, quadrature component；The polarization directions Y in-phase component, quadrature component) respectively input four photodiodes be balanced spy
It surveys, four road photoelectric currents of output input four high-speed AD converters progress Nyqusit samplings and are converted into sampled signal respectively again.Institute
The major function for stating digital signal processing unit is to realize to carry out data to the sampled signal through high speed analog-to-digital conversion sampling gained
Restore, including：When signal is reset, dispersion compensation, constant modulus algorithm is balanced, carrier auxiliary, differential decoding and error rate calculation.
In the optional embodiment, the PDM-QPSK optical signals of emitter output are via 80km standard single mode light first
- 28 transmission of fibre adds phase diversity optical coherent detection module as the signal light input polarization diversity is received.The polarization diversity
Add phase diversity optical coherent detection module include an outside cavity gas laser, two polarization beam apparatus, two 90 ° of optical mixer units, four
A photodiode and four high-speed AD converter compositions.
Secondly the reception signal light of input is passed through to a polarization beam apparatus realization two respectively with local oscillator light orthogonal
Polarization state separation, the local oscillator light source realized by the outside cavity gas laser.
Then local oscillator light and signal light with identical polarization state are inputted into 90 ° of optical mixer unit together, it is described
The major function of 90 ° of optical mixer units be make local oscillator light generate 0 °, 90 °, 180 °, 270 ° of phase shift then carry out beat frequency with signal light
Realize coherent detection.
Then by four road coherent detection optical signals of two 90 ° of optical mixer units output (polarization directions X in-phase component,
Quadrature component；The polarization directions Y in-phase component, quadrature component) respectively input four photodiodes be balanced detection, it is defeated
Go out four road photoelectric currents.
Four road photoelectric current is finally inputted into four high-speed AD converters respectively again and carries out Nyqusit samplings turn
Turn to sampling electric signal.
Although adding phase diversity optical coherent detection that can will receive the amplitude carried in signal area of light by above-mentioned polarization diversity
It is completely remained into phase information in the sampling electric signal after opto-electronic conversion, but due between local oscillator light source and originator light carrier
Frequency be difficult to keep completely the same and local oscillator light source line width and will introduce corresponding phase offset, sample electric signal frequency and
Phase will be disturbed by local oscillator light frequency and phase.In addition, there is also sending and receiving end sampling clocks during coherent detection not
Match and since the other signals such as channel static impairment and polarization mode dispersion effect caused by fibre-optical dispersion are damaged.Therefore, it needs
It introduces the digital signal processing unit to be estimated and compensated respectively for the above loss, and then completes to original transmitted signal
Recovery regeneration and restore.As shown in Fig. 7, it is preferable that the digital signal processing unit includes：When signal is reset, dispersion
Compensation, constant modulus algorithm is balanced, carrier auxiliary, differential decoding and error rate calculation.It is mainly used for solving ADC when wherein signal is reset
Clock misalignment issues caused by sampling clock mismatches, dispersion compensation and constant modulus algorithm equilibrium are mainly used for eliminating fibre-optical dispersion
It is damaged caused by signal with polarization mode dispersion, carrier auxiliary is mainly used for eliminating influence of the phase offset to signal, finally right
The signal constellation (in digital modulation) figure correctly restored carries out differential decoding and reverts to 0-1 bit sequences and by the total of error rate calculation assessment system
Body performance.
Above system provided in an embodiment of the present invention, due to using based on EML and the cascade orthogonal multiple carrier light source energy of PM
It is enough effectively to export subcarrier, so as to by the control of the line width of transmitting terminal in 1.9MHz, hereby it is ensured that light carrier line width with
The product satisfaction of symbol duration can implement the condition that 28G baud high speed PDM-QPSK signal coherences receive, and (product is less than 1
× 10-4) so that the practicable of embodiment 3 is possibly realized.
It can be seen from the above description that in the embodiment of the present invention, it is proposed that one kind is cascade just based on EML and PM
Multicarrier light source is handed over, and the multicarrier light source is applied to a PDM-QPSK modulated signals emitter and relevant optical detection system
System.Certain amount and the good subcarrier of flatness can not only be generated by the orthogonal multiple carrier light source, is also effectively overcome
Deficiency excessive with generation subcarrier line width in PM concatenated schemes DML so that be concerned with to high speed PDM-QPSK modulated signals
Light-receiving is possibly realized.In addition the orthogonal multiple carrier light source proposed by the present invention also has small size, low-power consumption and easy of integration
The characteristics of, thus having broad application prospects in real system.
Obviously, those skilled in the art should be understood that each module of the above invention or each step can be with general
Computing device realize that they can be concentrated on a single computing device, or be distributed in multiple computing devices and formed
Network on, optionally, they can be realized with the program code that computing device can perform, it is thus possible to which they are stored
It is performed by computing device in the storage device, and in some cases, it can be with different from shown in sequence execution herein
The step of going out or describing, either they are fabricated to each integrated circuit modules or by them multiple modules or
Step is fabricated to single integrated circuit module to realize.In this way, the present invention is not limited to any specific hardware and softwares to combine.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (13)
1. a kind of orthogonal multiple carrier light source, which is characterized in that including：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
The sinusoidal radio frequency signal source, for exporting the sinusoidal radio frequency signal of prearranged signals frequency to the power divider；
The power divider, for the sinusoidal radio frequency signal of input to be divided into left sinusoidal radio frequency signal and right wing sine
The left sinusoidal radio frequency signal is input to first electrical power amplifier by radiofrequency signal, by the right wing sinusoidal radio frequency
Signal is input to the phase-shifter；
First electrical power amplifier, for carrying out power amplification to the left sinusoidal radio frequency signal, after power amplification
The left sinusoidal radio frequency signal be input to the Electroabsorption Modulated Laser；
The phase-shifter, for being adjusted to the right wing sinusoidal radio frequency signal, so that the right wing sinusoidal radio frequency signal is same
The left sinusoidal radio frequency signal synchronizes, and the right wing sinusoidal radio frequency signal after output adjustment；
Second electrical power amplifier, for carrying out work(to the right wing sinusoidal radio frequency signal after phase-shifter adjustment
Rate is amplified, and the right wing sinusoidal radio frequency signal after power amplification is input to the phase-modulator；
The Electroabsorption Modulated Laser, the left sinusoidal radio frequency signal for being exported in first electrical power amplifier
Driving under generate optical signal, and the optical signal of generation is input to the phase-modulator；
The phase-modulator, the driving of the right wing sinusoidal radio frequency signal for being exported in second electrical power amplifier
Under, the optical signal of input is modulated, generates Frequency Locking and orthogonal multicarrier.
2. orthogonal multiple carrier light source according to claim 1, which is characterized in that further include：2 frequency multipliers are connected to described
Between phase-shifter and second electrical power amplifier, for realizing the right wing sinusoidal radio frequency signal of phase-shifter output
2 frequencys multiplication, the right wing sinusoidal radio frequency signal after 2 frequencys multiplication is input to second electrical power amplifier.
3. orthogonal multiple carrier light source according to claim 1, which is characterized in that the Electroabsorption Modulated Laser includes：
Distributed feedback laser, for exporting optical signal；
Electroabsorption modulator, the driving of the left sinusoidal radio frequency signal for being exported in first electrical power amplifier
Under, light modulation is carried out to the optical signal of distributed feedback laser output, exports modulated optical signal.
4. orthogonal multiple carrier light source according to claim 3, which is characterized in that the work electricity of the distributed feedback laser
Threshold current of the stream more than the distributed feedback laser.
5. orthogonal multiple carrier light source according to claim 3, which is characterized in that the bias voltage of the electroabsorption modulator
In the linear modulation region of the electroabsorption modulator.
6. orthogonal multiple carrier light source according to claim 3, which is characterized in that the Electroabsorption Modulated Laser also wraps
It includes：Semiconductor optical amplifier, the optical signal for being exported to the electroabsorption modulator is into compensation is advanced into, to compensate
State the insertion loss of electroabsorption modulator, the optical signal after output compensation.
7. orthogonal multiple carrier light source according to any one of claim 1 to 6, which is characterized in that the electro-absorption modulation
The line width of laser is 1.9MHz.
8. orthogonal multiple carrier light source according to any one of claim 1 to 6, which is characterized in that the phase-modulator
It is additionally operable to drive the radio frequency signal amplitude of the phase-modulator to increase the orthogonal sub-carriers number generated by increasing.
9. orthogonal multiple carrier light source according to any one of claim 1 to 6, which is characterized in that the electro-absorption modulation
Laser is additionally operable to the width by adjusting the subcarrier for driving the radio frequency signal amplitude of the Electroabsorption Modulated Laser to make generation
It spends flat.
10. a kind of palarization multiplexing orthogonal phase modulation PDM-QPSK sender units, which is characterized in that including：It is linked in sequence
Orthogonal multiple carrier light source, photon carrier selection module and PDM-QPSK optical emitting modules；Wherein,
The orthogonal multiple carrier light source orthogonal multiple carrier light source as claimed in any one of claims 1 to 9；
The photon carrier selection module includes：
Optical add/drop multiplexer is more by odd number road for the multicarrier of the quadrature carrier light source output to be divided into odd even two parts
Carrier wave or even number road multicarrier are input to adjustable light wave-filter；
The adjustable light wave-filter, for the bandwidth and wavelength by adjusting the adjustable light wave-filter, to inputting overloading
Wave is filtered to obtain required light carrier；
The PDM-QPSK optical emitting modules, including：
The phase difference of I/Q modulators, upper and lower two-arm is pi/2, and the light carrier for being exported in the photon carrier selection module drives
Under dynamic, simultaneously output light QPSK signals are generated；
Polarization multiplexer, the light QPSK signals for exporting I/Q modulators are divided into Liang Ge branches, to wherein all the way optical signal into
Row delay carries out power equalization to another way optical signal, then merges two ways of optical signals, and the polarization of analog signal is multiple
With PDM-QPSK optical signal of the generation eventually for transmitting
11. device according to claim 10, which is characterized in that the optical add/drop multiplexer is that frequency is 12.5/25-
GHz。
12. device according to claim 10, which is characterized in that the polarization multiplexer includes：
One polarization keeps photo-coupler, one section of optical delay line, an optical attenuator and a polarization beam combiner, wherein described
Polarization keeps photo-coupler to be used to the QPSK optical signals of input being divided into Liang Ge branches, wherein signal is input to the light and prolongs all the way
Slow line, another way are then input to the optical attenuator；
The optical delay line, the delay for generating 150 symbol lengths to the QPSK optical signals of input by simulation, will postpone
QPSK optical signals afterwards are input to the polarization beam combiner；
The optical attenuator is adjusted Yong the power of the QPSK optical signals of Yu Dui Ying, and QPSK light described in two branches is believed in realization
The equilibrium of number power, the polarization beam combiner is input to by the QPSK optical signals after adjustment；
The polarization beam combiner, for the two ways of optical signals to input by merging, the palarization multiplexing of analog signal generates
The PDM-QPSK signals.
13. a kind of palarization multiplexing orthogonal phase modulation PDM-QPSK signal coherence optical receiver systems, which is characterized in that including：It connects
Emitter described in any one of receiving apparatus and 10 to 12, wherein the reception device is for receiving the emitter hair
The PDM-QPSK signals sent.
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| PCT/CN2014/093989 WO2015176527A1 (en) | 2014-05-22 | 2014-12-16 | Orthogonal multicarrier light source and pdm-qpsk signal transmission device |
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