CN106992816A - Photonic propulsion wide-band microwave I/Q modulator and its operating method - Google Patents

Photonic propulsion wide-band microwave I/Q modulator and its operating method Download PDF

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Publication number
CN106992816A
CN106992816A CN201611010632.1A CN201611010632A CN106992816A CN 106992816 A CN106992816 A CN 106992816A CN 201611010632 A CN201611010632 A CN 201611010632A CN 106992816 A CN106992816 A CN 106992816A
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dpmzm
modulator
pdm
obpf
wide
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CN106992816B (en
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高永胜
文爱军
陈玮
谭庆贵
梁栋
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Xidian University
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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]
    • H04B10/5563—Digital frequency modulation
    • 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
    • H04B10/5165—Carrier suppressed; Single sideband; Double sideband or vestigial
    • 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
    • H04B10/60—Receivers
    • H04B10/61—Coherent receivers
    • H04B10/616—Details of the electronic signal processing in coherent optical receivers
    • H04B10/6162—Compensation of polarization related effects, e.g., PMD, PDL

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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)

Abstract

The invention discloses a kind of photonic propulsion wide-band microwave I/Q modulator and its operating method, this method is related to microwave technical field and technical field of photo communication.Methods described as shown in drawings, including laser diode (LD), palarization multiplexing double parallel horse once modulator (PDM DPMZM), optical band pass filter (OBPF), photodetector (PD).This method constructs a pair of upconverter using PDM DPMZM and OBPF, the baseband waveform on I and Q roads can be directly modulated on LO, broadband RF signal is obtained after PD.The present invention is simple in construction, and the band of IQ baseband waveforms is roomy, and the frequency of LO signals can be in a wide range of interior tuning.The phase relation of two upconverter can be adjusted flexibly, and then can solve the problems, such as IQ phase imbalances.The RF signals that the other I/Q modulator is produced are big to LO isolations, can suppress LO leakages.

Description

Photonic propulsion wide-band microwave I/Q modulator and its operating method
Technical field
The present invention relates to microwave technical field and technical field of photo communication, photonic propulsion wide-band microwave IQ modulation skills are related generally to Art.
Background technology
Requirement more and more higher with people to traffic rate, the positive court of electronic system such as present radar, broadband wireless communications Big bandwidth, wide-band direction to develop.In traditional microwave signal generation technology based on electronics, there is speed bottle in electronic device Neck, instant bandwidth is small, working frequency tuning performance is poor, and electromagnetic interference is serious.Photonic propulsion microwave signal generation technology has big instantaneous The series of advantages such as bandwidth, wide working band, electromagnetism interference and receive much concern.
At present in electronic system radio frequency sending set, typically first pass through digital analog converter and produce intermediate-freuqncy signal, it is then upper to become Frequency arrives radio frequency (RF).This structure has the disadvantage that：(1) when signal bandwidth is very big, it is desirable to which digital analog converter has higher Sample rate and working frequency, current modulus conversion technique are gradually difficult to meet needs；(2) when radiofrequency signal carrier frequency is higher, Generally require one and arrive two-stage up-conversion, configuration amplifier, wave filter are generally required after every grade of frequency conversion, it is complicated；(3) tradition is micro- The bandwidth of wave mixing device is small, and the passband tuning performance of wave filter is poor, causes emitter frequency range reconfigurability poor, it is impossible to meet following many The application demand of frequency range integration.
Base band data is directly carried out IQ modulation in carrier frequency, realizes that zero intermediate frequency is launched, adopting for digital analog converter can be reduced Sample rate and working frequency demand, simplified transmitter architecture.But there is Bandwidth-Constrained, IQ in current microwave signal IQ modulation techniques The problems such as uneven, local oscillator (LO) is revealed is difficult to solve.
Current optic communication and optical signal processing technology development are swift and violent, and researcher is realizing microwave signal using Photonics Technology All done a lot of work in terms of frequency conversion and phase shift, its advantage is also evident from.But the photonic propulsion IQ of wide-band microwave signal is adjusted Technology processed rare people's research.
The content of the invention
The problem of in order to solve in the presence of background technology, the present invention proposed it is a kind of using palarization multiplexing double parallel horse once The method that modulator (PDM-DPMZM) realizes wide-band microwave signal IQ modulation.This method constructs a pair of orthogonal upconverter, energy It is enough directly to modulate the baseband waveform on I and Q roads on LO, obtain broadband RF signal.In the program, the bandwidth of IQ baseband waveforms and The frequency of LO signals is only limited (more than 50GHz) by modulator and photodetector (PD) bandwidth, with traditional microwave IQ modulation The superiority bandwidth that device is unable to reach.In the program, the phase difference of two up-conversion signals can be adjusted flexibly, and then can solve IQ phase imbalance problems.The RF signals that the other I/Q modulator is produced are big to LO isolations, therefore can suppress LO leakages.
The technical solution adopted in the present invention is：Described device includes laser diode (LD), PDM-DPMZM, light belt and led to Wave filter (OBPF), PD.LD delivery outlet connects PDM-DPMZM optical signal input；The light signal output end of the modulator Connect OBPF input；OBPF output end connection PD.
The PDM-DPMZM is by a beam splitter, in parallel two (being designated as X, Y) double parallel horses once modulator up and down And polarization beam combiner (PBC) is constituted (DPMZM).There is two horses in parallel once modulator (MZM) inside each DPMZM, Four MZM are designated as Xa, Xb, Ya, Yb respectively successively.Two DPMZM main offset angle is designated as θxAnd θy。
The present invention operationally comprises the following steps：
(1) from the LD continuous light carriers exported are injected into PDM-DPMZM；
(2) I circuit-switched datas connect Xa radio-frequency head, and Q circuit-switched datas connect Ya radio-frequency head, and LO signals work(point two-way, two-way connects respectively Connect Xb and Yb radio-frequency head；
(3) Dc bias is provided to four MZM, four MZM is operated in smallest point；
(4) optical signal after two-way modulation up and down is complex as palarization multiplexing light, output modulator by the PBC inside PDM-DPMZM；
(5) palarization multiplexing optical signal enters OBPF, filter out under a LO modulation generation (or on) sideband, leave behind a LO side Band, and the information that I and Q roads are modulated around in light carrier；
(6) filtered optical signal enters one RF signal of output after PD, palarization multiplexing optical signal detection；
(7) adjusting two DPMZM main offset angle makes θxAnd θy90 degree of difference, such as θxFor 0 degree, θyFor 90 degree, then two DPMZM Orthogonal upconverter is constituted, PD output carrier frequency is equal to LO frequencies, carries the RF vector signals of I/Q data.
The present invention proposes a photonic propulsion wide-band microwave I/Q modulator and its operating method, and the program utilizes PDM- DPMZM realizes the Electro-optical Modulation of I/Q data and LO signals, and OBPF filters out a LO sideband, inclined by the master for adjusting two DPMZM RF vector signals after being modulated after angle setting, photodetection.The present invention is simple in construction, with very strong operability.
IQ waveforms and LO signals, which are used in suppressed carrier modulation system, obtained RF vector signals, in this programme inhibits LO Leakage.
Because the phase difference of IQ two-way upconverter in the program can continuously be appointed by two main offset angles of modulator Meaning regulation, it is hereby ensured that IQ two-way phase strict orthogonals, solves the problems, such as IQ unbalance in phase.
Brief description of the drawings
Fig. 1 is the schematic diagram of photonic propulsion wide-band microwave I/Q modulator of the present invention and its operating method；
Fig. 2 (a) is that the carrier frequency produced using the I/Q modulator is that 40GHz, bit rate 100MSym/s, modulation format are 16QAM's RF vector signals；
Fig. 2 (b) is to the planisphere and Error Vector Magnitude after the signal demodulation shown in Fig. 2 (a) by VSA (EVM)；
Fig. 2 (c) is that the carrier frequency produced using the I/Q modulator is that 40GHz, bit rate 100MSym/s, modulation format are 64QAM's RF vector signals；
Fig. 2 (d) is to the planisphere and EVM after the signal demodulation shown in Fig. 2 (c) by VSA.
Embodiment
Embodiments of the invention are elaborated below in conjunction with the accompanying drawings：The present embodiment using technical solution of the present invention before Put and implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to down The embodiment stated：
Fig. 1 is the schematic diagram of photonic propulsion wide-band microwave I/Q modulator and its operating method.In this example, device includes：LD、PDM- DPMZM, OBPF, PD, microwave signal source, microwave power distributor, vector signal source.LD delivery outlet passes through polarization maintaining optical fibre and PDM- DPMZM optical input is connected, and the I roads output end of vector signal source connects Xa rf inputs, and the Q roads of vector signal source are defeated Go out end connection Ya rf inputs, microwave signal source is connected with microwave power distributor common port, two delivery outlets of microwave power distributor The rf input port with Xb and Yb is connected respectively, and PDM-DPMZM output ends are connected with image intensifer input, image intensifer output End is connected with OBPF inputs, and OBPF output ends are connected with PD inputs.
In this example, the specific implementation step of method is：
Step one：The continuous light wave operation wavelength that LD is produced is 1552nm, and mean power is 15dBm；What vector signal source was produced IQ waveforms bit rate is 100MHz, coded format 16QAM；The LO signal center frequencies that microwave signal source is produced are 40GHz, power For 15dBm；PDM-DPMZM four MZM bands are wider than 40GHz, and half-wave voltage is about 3.5V, and extinction ratio is all higher than 30dB； OBPF centre wavelength 1552.2nm, three dB bandwidth 0.4nm；PD band is wider than 40GHz, responsiveness 0.6A/W.
Step 2：Upper Dc bias is supplied to modulator by direct voltage source so that four MZM are operated in smallest point.
Step 3：Two main offset angles are adjusted by direct voltage source, make θxFor 0 degree, θyFor 90 degree；
Step 4：The RF signals that PD is obtained enter frequency spectrograph, shown in experimental result such as Fig. 2 (a), obtain centre frequency 40GHz, code Speed 100MSym/s, modulation format are 16QAM RF vector signals, it can be seen that without obvious LO leakages, also without obvious Crosstalk；
Step 5：Obtained RF signals feeding VSA demodulation, is obtained shown in planisphere such as Fig. 2 (b), planisphere is clear Clear, EVM is 13.4%, and the RF signal qualitys produced by showing are good.
Step 6：The IQ waveform coding forms that vector signal source is produced are set to 64QAM, and other holdings are constant, repeat step four, Five, obtained centre frequency 40GHz, bit rate 100MSym/s, the RF vector signals that modulation format is 64QAM, spectrogram and star Seat figure is respectively as shown in Fig. 2 (c) and Fig. 2 (d), and produced RF signal qualitys are good.
In this example, IQ phase balance can be calibrated by adjusting two main offset angles.
To sum up, photonic propulsion wide-band microwave I/Q modulator and its operating method of the present invention, simple in construction to be easily achieved, with bright Aobvious superiority bandwidth, not by electromagnetic interference, systematic function is well and stably.
In a word, embodiments described above is only embodiments of the invention, is not only used for limiting the guarantor of the present invention Protect scope, it is noted that for those skilled in the art, can be with present disclosure Some equivalent variations and replacement are made, LO frequencies, IQ bit rates, modulation format can all change.These equivalent variations and replace with And the adjustment of frequency range also should be regarded as the scope of protection of the invention.

Claims (2)

1. photonic propulsion wide-band microwave I/Q modulator and its operating method, it is characterised in that：The output end connection of laser (LD) is inclined Once the input of modulator (PDM-DPMZM), PDM-DPMZM output end connect optical band pass filter to multiplexing double parallel of shaking horse (OBPF) input, OBPF output end connection photoelectric detector (PD)；
The PDM-DPMZM is by a beam splitter, two double parallel horses in parallel once modulator (DPMZM) and a polarization Bundling device (PBC) is integrated；There is two horses in parallel once modulator (MZM) inside first DPMZM, be designated as Xa, Xb, second Equally there are two MZM inside DPMZM, be designated as Ya, Yb, four MZM are operated in smallest point；I/Q data is loaded into Xa and Ya respectively Radio frequency mouthful, local oscillator (LO) signal work(point two-way is loaded into Xb and Yb radio frequency mouthful respectively；
The OBPF is used for a sideband for filtering out LO modulation；
Two DPMZM of adjustment main offset angle makes it differ 90 degree, and it is LO frequencies that carrier frequency is produced after PD, carries the radio frequency of I/Q data (RF) vector signal.
2. photonic propulsion wide-band microwave I/Q modulator according to claim 1 and its operating method, it is characterised in that：IQ phases The degree of balance can be adjusted by two DPMZM main offset angle.
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CN108761437A (en) * 2018-04-08 2018-11-06 南京航空航天大学 microwave photon polarization radar detection method and microwave photon polarization radar
CN108933630A (en) * 2018-06-13 2018-12-04 华中科技大学 A kind of light emission system of modulation format and palarization multiplexing switching
CN109728856A (en) * 2017-10-27 2019-05-07 富士通株式会社 The unbalanced estimation device of optical sender IQ, compensation device and electronic equipment
CN111398920A (en) * 2020-04-06 2020-07-10 西北工业大学 Broadband radar target Doppler frequency shift simulator and implementation method
CN111614403A (en) * 2020-04-27 2020-09-01 复旦大学 M of polarization multiplexing based intensity modulator2-QAM RF signal generation method and system
CN112134624A (en) * 2019-06-24 2020-12-25 西安电子科技大学 Efficient microwave photon channelized receiving method
CN112532312A (en) * 2020-11-25 2021-03-19 中国舰船研究设计中心 Ultra-wideband electromagnetic environment signal generation device and method based on parallel optical IQ modulator
CN112564811A (en) * 2020-12-13 2021-03-26 西北工业大学 Microwave photon I/Q down-conversion device with large dynamic range and adjusting method

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
CN109728856A (en) * 2017-10-27 2019-05-07 富士通株式会社 The unbalanced estimation device of optical sender IQ, compensation device and electronic equipment
CN109728856B (en) * 2017-10-27 2021-12-31 富士通株式会社 Estimation device and compensation device for IQ imbalance of optical transmitter and electronic equipment
CN108761437A (en) * 2018-04-08 2018-11-06 南京航空航天大学 microwave photon polarization radar detection method and microwave photon polarization radar
CN108761437B (en) * 2018-04-08 2020-07-03 南京航空航天大学 Microwave photon full polarization radar detection method and microwave photon full polarization radar
CN108933630A (en) * 2018-06-13 2018-12-04 华中科技大学 A kind of light emission system of modulation format and palarization multiplexing switching
CN112134624A (en) * 2019-06-24 2020-12-25 西安电子科技大学 Efficient microwave photon channelized receiving method
CN112134624B (en) * 2019-06-24 2021-06-01 西安电子科技大学 Efficient microwave photon channelized receiving method
CN111398920A (en) * 2020-04-06 2020-07-10 西北工业大学 Broadband radar target Doppler frequency shift simulator and implementation method
CN111398920B (en) * 2020-04-06 2023-03-28 西北工业大学 Broadband radar target Doppler frequency shift simulator and implementation method
CN111614403A (en) * 2020-04-27 2020-09-01 复旦大学 M of polarization multiplexing based intensity modulator2-QAM RF signal generation method and system
CN111614403B (en) * 2020-04-27 2023-08-29 复旦大学 M of intensity modulator based on polarization multiplexing 2 Method and system for generating QAM RF signal
CN112532312A (en) * 2020-11-25 2021-03-19 中国舰船研究设计中心 Ultra-wideband electromagnetic environment signal generation device and method based on parallel optical IQ modulator
CN112564811A (en) * 2020-12-13 2021-03-26 西北工业大学 Microwave photon I/Q down-conversion device with large dynamic range and adjusting method
CN112564811B (en) * 2020-12-13 2023-11-10 西北工业大学 Large dynamic range microwave photon I/Q down-conversion device and adjusting method

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