CN206946131U - A kind of device that optics nyquist pulse is produced based on bipolar electrode Mach zehnder modulators - Google Patents
A kind of device that optics nyquist pulse is produced based on bipolar electrode Mach zehnder modulators Download PDFInfo
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- CN206946131U CN206946131U CN201720650701.9U CN201720650701U CN206946131U CN 206946131 U CN206946131 U CN 206946131U CN 201720650701 U CN201720650701 U CN 201720650701U CN 206946131 U CN206946131 U CN 206946131U
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- bipolar electrode
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- electrode mach
- radio frequency
- zehnder modulator
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- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
A kind of device that optics nyquist pulse is produced based on bipolar electrode Mach zehnder modulators, the bipolar electrode Mach zehnder modulators (MZM) driven by the combination of fundamental wave and second harmonic radiofrequency signal are produced to demonstrate simple efficient nyquist pulse.The raised cosine shape termporal filter and time lens that the device creates in MZM, without any external optical wave filter, so as to produce the optics nyquist pulse with 0.52 roll-off factor and 37% intrinsic conversion efficiency.Pass through somewhat modification time wave filter and time lens, it is possible to achieve the appropriate adjustability in α (in α ＞ 0.3).The device does not need any external optical wave filter, and the generation for nyquist pulse, which has, saves and reduce cost benefit.
Description
Technical field
It the utility model is related to a kind of dress that optics nyquist pulse is produced based on bipolar electrode Mach-Zehnder modulator
Put, the utility model belongs to fiber optic communication process field, for lifting the transmission capacity of optical fiber telecommunications system.
Background technology
In recent years, internet has penetrated into the every aspect of our lives, especially under the overall background of " internet+",
Greatly impact and new visual angle are brought to every profession and trade.Smart mobile phone, social media, high definition internet television, the more matchmakers of network
The new business such as body, Internet of Things, big data and cloud computing are fast-developing.Network has become a part for people's life, with this
Meanwhile requirement of the people to network bandwidth " network speed " in other words is continuously increased, price reduction speed-raising has become main flow craving.With this phase
Close, the rate of information throughput and data traffic in communication network are increasing substantially always, most basic to composition communication network
Physical layer link -- fiber optic network proposes the requirement of high-performance high reliability.Increasing experts and scholars start both at home and abroad
Pay close attention to ultrahigh speed, vast capacity, the generation technology of high spectrum efficiency optical signal.
Optical Time Division Multiplexing (OTDM) technology has been widely used for improving the limitation of character rate modulation bandwidth.Especially, due to
The optics nyquist pulse of its intersymbol interference suppressed, spectral efficient and high dispersion tolerance is considered as that OTDM is transmitted
Most potential candidate.Pulse is characterised by roll-off factor α (0≤α≤1), and α=0, which corresponds to have, minimizes spectral width
The time waveform of the sinusoidal shape of the rectangular spectrum of degree.Larger α values can increase spectral width, while be prevented in time waveform
Oscillatory tail.
Have at present by using optical frequency com (OFC) generator and optical band pass filter or arbitrary filter to produce
Raw pulse, although arbitrary filter can be used for controlling α, for each OFC lines, many control terminals make system complex
Change, and the insertion loss of wave filter is undesirable.Direct optics Nyquist is proved by using the MZM of two synchronizations
Pulses generation.Although this technology can be produced in the case of without using any external filter the optics with α=0 how Kui
This special pulse, but available repetition rate is reduced to 2/3rds of MZM modulation bandwidths, and caused using two MZM
Big insertion loss be still a problem.The use of optical parametric amplification is reported at present, yet with its non-linear spy
Property, Self-phase modulation is very inconvenient for stable operation.On the other hand, there is the light for carrying outside bandpass filter
The report of nyquist pulse generator and the flat OFC generators based on time lens is learned, this technology is relatively easy, still
Outside bandpass filter is needed to use to carry out light spectrum reshaping.Passive configuration based on CW lasing light emitters and external modulator is simple
Property, stability and still there is certain advantage with the compatibility aspect of single-slice integrated semiconductor laser and modulator.For example,
Trembled by using pulse caused by bipolar electrode Mach-Zehnder modulator (MZM) due to its passive configuration with the ultralow time
Dynamic property., it is necessary to study more cheap optics nyquist pulse device from the point of view of cost-effective.
The content of the invention
Basic conception of the present utility model is：The bipolar electrode driven using the combination by fundamental wave and second harmonic radiofrequency signal
Mach-Zehnder modulator (MZM) produces to demonstrate simple efficient nyquist pulse.More than the liter that the device creates in MZM
String shape termporal filter and time lens, without any external optical wave filter, so as to produce with 0.52 roll-off factor
With the optics nyquist pulse of 37% intrinsic conversion efficiency.
The utility model provides a kind of dress that optics nyquist pulse is produced based on bipolar electrode Mach-Zehnder modulator
Put, including：
One signal generator, for producing the radiofrequency signal that frequency is 6GHz；
One multiplier, for producing 12GHz second harmonic signal；
The radio frequency combiner of one isolation 18dB signals, for radiofrequency signal and second harmonic signal to be amplified and combine
And it is applied on a MZM electrode；
One bipolar electrode Mach-Zehnder modulator, half wavelength voltage VπFor 5.3V, modulation bandwidth ＞ 25GHz；
One DC voltage, for applying voltage to another electrode；
One CW lasers, wavelength 1549.8nm, for producing broadband optical signal；
One single-mode fiber, length 6km；
One EDFA Erbium-Doped Fiber Amplifier；
One spectrometer；
One Optical Sampling oscillograph, for measured waveform.
The beneficial effects of the utility model：
By second harmonic radiofrequency signal come modification time wave filter and time lens, it is possible to achieve in α (in α ＞ 0.3)
Appropriate adjustability.The present apparatus does not need any external optical wave filter, the generation for nyquist pulse have energy-conservation and
Reduce cost benefit.
Brief description of the drawings
Fig. 1 is that one kind involved by the utility model is based on bipolar electrode Mach-Zehnder modulator generation optics Nyquist
The overall schematic of the device of pulse.
Fig. 2 is that one kind involved by the utility model is based on bipolar electrode Mach-Zehnder modulator generation optics Nyquist
The schematic diagram of the device of pulse.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and detailed description.
Fig. 1 is that one kind involved by the utility model is based on bipolar electrode Mach-Zehnder modulator generation optics Nyquist
The overall schematic of the device of pulse.The device includes signal generator, frequency multiplier, phase shifter, radio frequency combiner, radio frequency amplification
Device, bipolar electrode Mach-Zehnder modulator, CW lasers, dc source, single-mode fiber, erbium-doped fiber amplifier, spectrometer and light
Sampling oscilloscope.
Signal generator 1, its output end are connected with the input port of frequency multiplier 2；
Frequency multiplier 2, its output end are connected with the input port of phase shifter 3；
Phase shifter 3, its output end are connected with the input port of radio frequency amplifier 4；
Radio frequency amplifier 4, its output end are connected with the port 1 of radio frequency combiner 5；
Radio frequency combiner 5, its port 3 are connected with the electrode 1 of bipolar electrode Mach-Zehnder modulator 8；
Phase shifter 6, its input are connected with the output port of signal generator 1；
Radio frequency amplifier 7, its input are connected with the output port of phase shifter 6, its output end and the end of radio frequency combiner 5
Mouth 2 is connected；
Bipolar electrode Mach-Zehnder modulator 8, its input are connected with CW lasers 15；
Single-mode fiber 9, its input are connected with the output port of bipolar electrode Mach-Zehnder modulator 8；
Erbium-doped fiber amplifier 10, its input are connected with the output port of single-mode fiber 9；
Optical Sampling oscillograph 11, its input are connected with the output port of erbium-doped fiber amplifier 10；
Spectrometer 12, its input are connected with the output port of bipolar electrode Mach-Zehnder modulator 8；
Radio frequency amplifier 13, its input are connected with the output port of signal generator 1, its output port and bipolar electrode horse
The electrode 2 of conspicuous-zehnder modulators 8 is connected；
DC voltage 14 is connected with the electrode 2 of bipolar electrode Mach-Zehnder modulator 8.
Wherein, signal generator 1 is used for the radiofrequency signal for producing 6GHz；Frequency multiplier 2 is used for the second harmonic for producing 12GHz
Signal；Phase shifter 3 is used to be adjusted waveform；Radio frequency amplifier 4 is used for the power amplification of signal to sufficiently large；Radio frequency group
Clutch 5 is used for the signal for isolating 18dB, and signal is amplified and combined and is applied to bipolar electrode Mach-Zehnder modulator 8
An electrode on；Bipolar electrode Mach-Zehnder modulator 8 is carried out by periodicity raised cosine in shape to the input intensity of CW light sources
Modulation, and cause quadratic phase modulation approximate in limited cycle duration；Single-mode fiber 9 is used for linear compensation；Mix bait
Fiber amplifier 10 is used to be amplified optical signal；Optical Sampling oscillograph 11 is used for the measurement of time waveform；Spectrometer 12 is used
In the measurement of spectrum；Radio frequency amplifier 13 is used to be amplified 6GHz signals and be applied to bipolar electrode Mach-Zehnder modulator 8
Another electrode on；DC voltage 14 is used for another electrode for being applied to bipolar electrode Mach-Zehnder modulator 8；CW swashs
Light device 15 is used to produce wideband light source.
Bipolar electrode Mach-Zehnder modulator 8 uses commercial LiNbO3Bipolar electrode Mach-Zehnder modulator, half-wavelength electricity
Press as 5.3V, modulation bandwidth ＞ 25GHz；
The length of single-mode fiber 9 is 6km；
CW lasers 15 use the light source when wavelength is 1549.8nm；
After above-mentioned regulation, device produce with 0.52 roll-off factor and 37% intrinsic conversion efficiency optics how Kui
This special pulse.
Fig. 2 is that one kind involved by the utility model is based on bipolar electrode Mach-Zehnder modulator generation optics Nyquist
The schematic diagram of the device of pulse.Light beam is handled by spatial filter 1 and space lens 3, and Fourier occurs in focal position
Conversion converts so as to realize from raised cosine in shape 2 to the beam profile of Nyquist shape 4.The time domain simulation of the device can lead to
Usage time wave filter and time lens are crossed to realize.First, the input intensity of CW laser by intensity modulator 5 periodically to rise
Cosine shape is modulated；Secondly, the quadratic phase modulation as time lens 6 is applied to intensity-modulated light.Finally, time waveform quilt
Fourier transformation, and obtain nyquist pulse after being propagated in the optical fiber 7 of the certain length for compensating quadratic phase.
The generation of pulse signal is that the mapping to frequency domain, raised cosine 8 to spectrum 12 realize conversion of the time domain to frequency domain, light using time domain
Spectrum 11 is frequency-region signal corresponding to waveform 8, and waveform 9 is time-domain signal corresponding to spectrum 12；Waveform 10 is nyquist pulse, light
Spectrum 13 is frequency-region signal corresponding to nyquist pulse 10.
The bipolar electrode Mach-Zehnder that the utility model uses the combination by fundamental wave and second harmonic radiofrequency signal to drive is modulated
Device produces to demonstrate simple efficient nyquist pulse.The raised cosine shape termporal filter that the utility model creates in MZM
With time lens, without any external optical wave filter, inherently changed with 0.52 roll-off factor and 37% so as to produce
The optics nyquist pulse of efficiency.It is new by second harmonic radiofrequency signal modification time wave filter and time lens, this practicality
Type can realize the appropriate adjustability in α (in α ＞ 0.3).The utility model does not need any external optical wave filter, makes its right
Have in the generation of nyquist pulse and save and reduce cost benefit.
Claims (2)
- A kind of 1. device that optics nyquist pulse is produced based on bipolar electrode Mach-Zehnder modulator, it is characterised in that：The dress Put including signal generator, frequency multiplier, phase shifter, radio frequency combiner, radio frequency amplifier, bipolar electrode Mach-Zehnder modulator, CW Laser, dc source, single-mode fiber, erbium-doped fiber amplifier, spectrometer and Optical Sampling oscillograph,Signal generator, its output end are connected with the input port of frequency multiplier；Frequency multiplier, its output end are connected with the input port of phase shifter；Phase shifter, its output end are connected with the input port of radio frequency amplifier；The port 1 of radio frequency amplifier, its output end and radio frequency combiner connects；Radio frequency combiner, its port 3 are connected with the electrode 1 of bipolar electrode Mach-Zehnder modulator；Phase shifter, its input are connected with the output port of signal generator；Radio frequency amplifier, its input are connected with the output port of phase shifter, its output end and the phase of port 2 of radio frequency combiner Even；Bipolar electrode Mach-Zehnder modulator, its input are connected with CW lasers；Single-mode fiber, its input are connected with the output port of bipolar electrode Mach-Zehnder modulator；The output port connection of erbium-doped fiber amplifier, its input and single-mode fiber；The output port connection of Optical Sampling oscillograph, its input and erbium-doped fiber amplifier；Spectrometer, its input are connected with the output port of bipolar electrode Mach-Zehnder modulator；Radio frequency amplifier, its input are connected with the output port of signal generator, its output port and bipolar electrode Mach-Zehnder The electrode 2 of modulator is connected；DC voltage is connected with the electrode 2 of bipolar electrode Mach-Zehnder modulator.
- A kind of optics nyquist pulse is produced based on bipolar electrode Mach-Zehnder modulator 2. according to claim 1 Device, it is characterised in that：The commercial LiNbO of the model of the bipolar electrode Mach-Zehnder modulator3, half wavelength voltage is 5.3V, modulation bandwidth ＞ 25GHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720650701.9U CN206946131U (en) | 2017-06-02 | 2017-06-02 | A kind of device that optics nyquist pulse is produced based on bipolar electrode Mach zehnder modulators |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720650701.9U CN206946131U (en) | 2017-06-02 | 2017-06-02 | A kind of device that optics nyquist pulse is produced based on bipolar electrode Mach zehnder modulators |
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| Publication Number | Publication Date |
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| CN206946131U true CN206946131U (en) | 2018-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720650701.9U Expired - Fee Related CN206946131U (en) | 2017-06-02 | 2017-06-02 | A kind of device that optics nyquist pulse is produced based on bipolar electrode Mach zehnder modulators |
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2017
- 2017-06-02 CN CN201720650701.9U patent/CN206946131U/en not_active Expired - Fee Related
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180130 Termination date: 20180602 |