CN102811093A - Parallel modulation optical frequency-multiplying millimeter-wave radio over fiber (RoF) system and quadrature phase shift keying (QPSK) modulation way thereof - Google Patents
Parallel modulation optical frequency-multiplying millimeter-wave radio over fiber (RoF) system and quadrature phase shift keying (QPSK) modulation way thereof Download PDFInfo
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- CN102811093A CN102811093A CN201210232185XA CN201210232185A CN102811093A CN 102811093 A CN102811093 A CN 102811093A CN 201210232185X A CN201210232185X A CN 201210232185XA CN 201210232185 A CN201210232185 A CN 201210232185A CN 102811093 A CN102811093 A CN 102811093A
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Abstract
The invention relates to a parallel modulation optical frequency-multiplying millimeter-wave radio fiber (RoF) system and a quadrature phse shift keying (QPSK) modulation way thereof. The system consists of a central station and a base station, which are connected with each other through a downlink optical fiber. The central station consists of a laser, a dual-electrode Mach-Zehnder optical modulator, a cosine microwave signal source, a pi phase shifter and an erbium-doped fiber amplifier (EDFA). The base station consists of an optical detector, a prepose low-noise amplifier, a power divider, a band pass filter, a millimeter wave amplifier and a millimeter wave transmitting antenna. The central station is connected with the base station through the downlink optical fiber. A QPSK middle-frequency signal is modulated onto an optical wave by utilizing an optical frequency-multiplying method in the central station, and the base station generates a millimeter wave QPSK signal through the photoelectric detection after receiving the optical wave signal. The system is simple in structure, stable in performance and easy to realize.
Description
Technical field
The present invention relates to a kind of parallel modulation optical frequency-doubling millimeter wave RoF (radio over fiber) system and QPSK thereof (Quadrature Phase Shift Keying, QPSK) modulation system.Propose a kind ofly,, realize that again be the modulation of millimeter wave with signal to the Modulation Transfer of light wave when light wave produces millimeter wave based on the RoF system configuration of optical frequency-doubling method and new parallelly connected optical modulations.
Background technology
Along with radio communication towards the further developing of express network, the frequency spectrum resource of low frequency part and the transmission range of coaxial cable have seriously limited development of wireless communication devices and application; The shortcoming that the while millimeter-wave signal is not suitable in coaxial cable, transmitting has promoted the fusion of optical communication and radio communication, and this will become the developing direction of future communications.RoF is the focus of current communications field research, has contained correlative technology fields such as fixed radio communication and mobile radio telecommunications.The RoF art designs utilize the non-linear generation millimeter wave of Mach-Zender modulator, produce radio frequency with optical frequency-doubling method, use the rf modulations light wave, through the modulated light wave of Optical Fiber Transmission, radio frequency demodulation from the light wave a series of conversion process such as get off.
Summary of the invention
The objective of the invention is to the defective to the prior art existence, a kind of parallel modulation frequency-doubling millimeter wave RoF system of optical and QPSK modulation system thereof are provided, make system configuration simple, stability is good, and method is easy to realize, and is with low cost.
The technical solution adopted for the present invention to solve the technical problems is: a kind of parallel modulation frequency-doubling millimeter wave RoF system of optical is provided, comprises that a central station connects a base station through downlink optical fiber.It is characterized in that: the structure of central station comprises a laser, the first bipolar electrode Mach-Zender optical modulator, the second bipolar electrode Mach-Zender optical modulator, the 3rd bipolar electrode Mach-Zender optical modulator, microwave signal source, phase shifter, the one the second two signal input parts and mixes the jade or pearl earring fiber amplifier; It wherein on first arm of the 3rd bipolar electrode Mach-Zender optical modulator the first bipolar electrode Mach-Zender optical modulator; And be the second bipolar electrode Mach-Zender optical modulator on its another arm, more than three bipolar electrode Mach-Zender optical modulators constituted lithium niobate modulator; Described base station comprises photo-detector, preposition low noise amplifier, power splitter, first band pass filter, second band pass filter, first millimeter wave amplifier, second millimeter wave amplifier, frequency mixer and millimeter wave transceiving antenna.Link to each other through downlink optical fiber between central station and the base station.The output of laser links to each other with the input of the 3rd bipolar electrode Mach-Zender optical modulator; The output of microwave signal source divides two-way; One tunnel output connects first arm of the first bipolar electrode Mach-Zender optical modulator; The output on another road links to each other with the input of phase shifter, and the output of phase shifter links to each other with second arm of the first bipolar electrode Mach-Zender optical modulator, and first signal input part links to each other with first arm of the second bipolar electrode Mach-Zender optical modulator; The secondary signal input links to each other with second arm of the second bipolar electrode Mach-Zender optical modulator; The output of the 3rd bipolar electrode Mach-Zender optical modulator links to each other with the input of mixing the jade or pearl earring fiber amplifier, and the output of mixing the jade or pearl earring fiber amplifier links to each other through the input of the photodetector in downlink optical fiber and the base station, and the output of photodetector links to each other with the input of preposition low noise amplifier; The output of preposition low noise amplifier links to each other with the input of power splitter; One tunnel output of power splitter links to each other with the input of first band pass filter, and the output of first band pass filter links to each other with the input of first millimeter wave amplifier, and the output of first millimeter wave amplifier links to each other with the transmitting terminal of millimeter wave transceiving antenna; Another road output of power splitter links to each other with the input of second band pass filter; The output of second band pass filter links to each other with the input of second millimeter wave amplifier, and the local oscillator end of the output of second millimeter wave amplifier and frequency mixer links to each other, and the receiving terminal of millimeter wave transceiving antenna links to each other with the rf inputs of frequency mixer.
The QPSK modulation system of said system: the output signal of microwave signal source is added on article one arm of the first bipolar electrode Mach-Zender modulator; And the signal of this microwave signal source output through 180 ° of phase shifts after, be added on the second arm of the first bipolar electrode Mach-Zender modulator.Add the I road intermediate-freuqncy signal of QPSK signal on the one arm of the second bipolar electrode Mach-Zender modulator, add the Q road intermediate-freuqncy signal of QPSK signal in addition on the one arm.The QPSK lithium niobate modulator uses push-pull mode; The light signal of the QPSK data message component that is used to produce the harmonic component that contains the cosine microwave signal and carries; After the opto-electronic conversion of photo-detector is passed through to the light signal that receives in described base station, the QPSK signal that obtains the harmonic component of cosine microwave signal and carry.The harmonic component of the cosine microwave signal of gained can be used as the local oscillation signal of up receiving demodulation, and the QPSK data message that carries is launched through the millimeter wave transceiving antenna.
The present invention compared with prior art; Have following conspicuous outstanding substantive distinguishing features and marked improvement: native system adopts the DPSK lithium niobate modulator of being made up of three Mach-Zender modulators to produce stable millimeter wave; Saved the optical filter in the central station; Simplify the structure, reduced cost.Owing to use push-pull mode, need not big optical input power, can use existing substrate bias controller on the market, just can make whole system be operated in stable status.Also realized the generation of up local oscillation signal when native system has been accomplished descending 38GHz modulated signal, and produced a plurality of scanning microwave harmonic wave passages, for the further dilatation of system lays the foundation.
Description of drawings
Fig. 1 is a system block diagram of the present invention.
Embodiment
Below in conjunction with instantiation, further set forth the present invention.Should be understood that these instances only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can make various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
The parallel modulation frequency-doubling millimeter wave RoF system of optical of present embodiment, as shown in Figure 1, comprise a central station (1), connect a base station (2) through downlink optical fiber (3).Link to each other through downlink optical fiber (3) between central station (1) and base station (2).The output of laser (1-1) links to each other with the input of the 3rd bipolar electrode Mach-Zender optical modulator (MZM-3); The output of microwave signal source (1-3) divides two-way; One tunnel output connects first arm of the first bipolar electrode Mach-Zender optical modulator (MZM-1); The output on another road links to each other with the input of phase shifter (1-4); The output of phase shifter (1-4) links to each other with second arm of the first bipolar electrode Mach-Zender optical modulator (MZM-1); First signal input part (1-5) links to each other with first arm of the second bipolar electrode Mach-Zender optical modulator (MZM-2); Secondary signal input (1-6) links to each other with second arm of the second bipolar electrode Mach-Zender optical modulator (MZM-2); The output of the 3rd bipolar electrode Mach-Zender optical modulator (MZM-3) links to each other with the input of mixing jade or pearl earring fiber amplifier (1-7); The output of mixing jade or pearl earring fiber amplifier (1-7) links to each other through the input of the photodetector (2-1) in downlink optical fiber (3) and base station (2); The output of photodetector (2-1) links to each other with the input of preposition low noise amplifier (2-2), and the output of preposition low noise amplifier (2-2) links to each other with the input of power splitter (2-3), and one tunnel output of power splitter (2-3) links to each other with the input of first band pass filter (2-4); The output of first band pass filter (2-4) links to each other with the input of first millimeter wave amplifier (2-6); The output of first millimeter wave amplifier (2-6) links to each other with the transmitting terminal of millimeter wave transceiving antenna (2-9), and another road output of power splitter (2-3) links to each other with the input of second band pass filter (2-5), and the output of second band pass filter (2-5) links to each other with the input of second millimeter wave amplifier (2-7); The output of second millimeter wave amplifier (2-7) links to each other with the local oscillator end of frequency mixer (2-8), and the receiving terminal of millimeter wave transceiving antenna (2-9) links to each other with the rf inputs of frequency mixer (2-8).
The QPSK modulation system of said system: the output signal of microwave signal source (1-3) is added on article one arm of the first bipolar electrode Mach-Zender modulator (MZM-1); And the signal of this microwave signal source (1-3) output through 180 ° of phase shifts after, be added on the second arm of the first bipolar electrode Mach-Zender modulator (MZM-1).Add the I road intermediate-freuqncy signal (promptly importing the I road intermediate-freuqncy signal of QPSK signal) of QPSK signal on the one arm of the second bipolar electrode Mach-Zender modulator (MZM-2), add the Q road intermediate-freuqncy signal (promptly importing the Q road intermediate-freuqncy signal of QPSK signal) of QPSK signal in addition on the one arm at the 1-6 signal input port at the 1-5 signal input port.QPSK lithium niobate modulator (1-2) is used to produce the harmonic component that contains the cosine microwave signal and the light signal of the QPSK data message component that carries; After the opto-electronic conversion of photo-detector (2-1) is passed through to the light signal that receives in described base station (2), the QPSK signal that obtains the harmonic component of cosine microwave signal and carry.The harmonic component of the cosine microwave signal of gained can be used as the local oscillation signal of up receiving demodulation, and the QPSK data message that carries is launched through millimeter wave transceiving antenna (2-9).
Suppose four arm delay inequalities of DQPSK lithium niobate modulator τ=0, this moment, its output light-wave electric field expression formula was:
Wherein,
is the light wave electric field amplitude;
is the central angle frequency of light wave;
is the microwave signal angular frequency;
is phase-modulation index;
;
is the microwave signal amplitude, and
is the phase modulator half-wave voltage;
,
are I, the Q two paths of signals of QPSK, and
is the intermediate-freuqncy signal angular frequency.
With the light signal of DQPSK lithium niobate modulator output after mixing the jade or pearl earring fiber amplifier; Be transferred to the base station by downlink optical fiber; Photo-detector detects luminous intensity; Form photoelectric current
, expression formula is following:
Wherein, R is the reflection coefficient of photo-detector.Following formula is made Bessel function to launch; Simultaneously because the QPSK signal of input is that intermediate-freuqncy signal is regarded as linear modulation; Therefore corresponding
; The value of
is very little, then in the formula (1)
Therefore formula (1) can be reduced to
From
Extract the lower side frequency signal of the millimeter-wave signal that contains the QPSK signal in;
From
Extract the upper side frequency signal of the millimeter-wave signal that contains the QPSK signal in.Only need select for use corresponding filter just can and go up lower side frequency with millimeter-wave signal leaches.
Instantiation:
At the transmitting terminal of central station, as the laser works of light source at the 1550nm wavelength, live width 1MHz, power 15.5dbm links to each other with the input of DQPSK lithium niobate modulator through protecting inclined to one side tail optical fiber.It is the cosine wave of Fs=10GHz that the cosine microwave signal source produces frequency; Amplitude
is 6.5V; It is the data message of 1Gbps that the QPSK signal source produces base band speed, they is added to the rf inputs mouth of lithium niobate modulator.The phase modulation half-wave voltage of lithium niobate modulator
is 3.9V; The phase-modulation index that produces is
; (
is 0.3996 at this moment; Maximum), at this moment the output light-wave of lithium niobate modulator is:
Process is mixed the jade or pearl earring fiber amplifier, downlink optical fiber is sent to the base station, and photo-detector obtains photoelectric current:
Claims (2)
1. parallel modulation frequency-doubling millimeter wave RoF system of optical; Comprise that a central station (1) connects a base station (2) through downlink optical fiber (3); It is characterized in that: described central station (1) comprises a laser (1-1), the first bipolar electrode Mach-Zender optical modulator (MZM-1), the second bipolar electrode Mach-Zender optical modulator (MZM-2), the 3rd bipolar electrode Mach-Zender optical modulator (MZM-3), microwave signal source (1-3), phase shifter (1-4), the one the second two signal input parts (1-5 and 1-6) and mixes jade or pearl earring fiber amplifier (1-7); It wherein on first arm of the 3rd bipolar electrode Mach-Zender optical modulator (MZM-3) the first bipolar electrode Mach-Zender optical modulator (MZM-1); And be the second bipolar electrode Mach-Zender optical modulator (MZM-2) on its another arm, more than three bipolar electrode Mach-Zender optical modulators constituted lithium niobate modulator (1-2); The output of laser (1-1) links to each other with the input of the 3rd bipolar electrode Mach-Zender optical modulator (MZM-3); The output of microwave signal source (1-3) divides two-way; One tunnel output connects first arm of the first bipolar electrode Mach-Zender optical modulator (MZM-1); The output on another road links to each other with the input of phase shifter (1-4); The output of phase shifter (1-4) links to each other with second arm of the first bipolar electrode Mach-Zender optical modulator (MZM-1); First signal input part (1-5) links to each other with first arm of the second bipolar electrode Mach-Zender optical modulator (MZM-2); Secondary signal input (1-6) links to each other with second arm of the second bipolar electrode Mach-Zender optical modulator (MZM-2), and the output of the 3rd bipolar electrode Mach-Zender optical modulator (MZM-3) links to each other with the input of mixing jade or pearl earring fiber amplifier (1-7), and the output of mixing jade or pearl earring fiber amplifier (1-7) links to each other through the input of the photodetector (2-1) in downlink optical fiber (3) and base station (2); Described base station (2) comprises photo-detector (2-1), preposition low noise amplifier (2-2), power splitter (2-3), first band pass filter (2-4), second band pass filter (2-5), first millimeter wave amplifier (2-6), second millimeter wave amplifier (2-7), frequency mixer (2-8) and millimeter wave transceiving antenna (2-9); The output of photodetector (2-1) links to each other with the input of preposition low noise amplifier (2-2); The output of preposition low noise amplifier (2-2) links to each other with the input of power splitter (2-3); One tunnel output of power splitter (2-3) links to each other with the input of first band pass filter (2-4); The output of first band pass filter (2-4) links to each other with the input of first millimeter wave amplifier (2-6); The output of first millimeter wave amplifier (2-6) links to each other with the transmitting terminal of millimeter wave transceiving antenna (2-9); Another road output of power splitter (2-3) links to each other with the input of second band pass filter (2-5); The output of second band pass filter (2-5) links to each other with the input of second millimeter wave amplifier (2-7); The output of second millimeter wave amplifier (2-7) links to each other with the local oscillator end of frequency mixer (2-8), and the receiving terminal of millimeter wave transceiving antenna (2-9) links to each other with the rf inputs of frequency mixer (2-8).
2. QPSK modulation system according to claims 1 described parallel modulation frequency-doubling millimeter wave RoF system of optical; It is characterized in that: the output signal of described microwave signal source (1-3) is added on article one arm of the first bipolar electrode Mach-Zender modulator (MZM-1); And the signal of this microwave signal source (1-3) output through 180 ° of phase shifts after, be added on the second arm of the first bipolar electrode Mach-Zender modulator (MZM-1); Add the I road intermediate-freuqncy signal of QPSK signal on the one arm of the second bipolar electrode Mach-Zender modulator (MZM-2); Promptly import the I road intermediate-freuqncy signal of QPSK signal at first signal input port (1-5); Add the Q road intermediate-freuqncy signal of QPSK signal in addition on the one arm, promptly import the Q road intermediate-freuqncy signal of QPSK signal at secondary signal input port (1-6); QPSK lithium niobate modulator (1-2) is used to produce the harmonic component that contains the cosine microwave signal and the light signal of the QPSK data message component that carries; After the opto-electronic conversion of photo-detector (2-1) is passed through to the light signal that receives in described base station (2), the QPSK signal that obtains the harmonic component of cosine microwave signal and carry; The harmonic component of the cosine microwave signal of gained can be used as the local oscillation signal of up receiving demodulation, and the QPSK data message that carries is launched through millimeter wave transceiving antenna (2-9).
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| CN106154592A (en) * | 2016-08-31 | 2016-11-23 | 武汉光迅科技股份有限公司 | The autobias control method of MZI type IQ electrooptic modulator in parallel and device thereof |
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| CN109991623A (en) * | 2019-04-30 | 2019-07-09 | 深圳市镭神智能系统有限公司 | A kind of distribution type laser radar |
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Application publication date: 20121205 |