CN86106306A - Optical self-heterodyne communication system - Google Patents
Optical self-heterodyne communication system Download PDFInfo
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- CN86106306A CN86106306A CN 86106306 CN86106306A CN86106306A CN 86106306 A CN86106306 A CN 86106306A CN 86106306 CN86106306 CN 86106306 CN 86106306 A CN86106306 A CN 86106306A CN 86106306 A CN86106306 A CN 86106306A
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Abstract
Optical self-heterodyne communication system is a kind of optical heterodyne mechanics of communication of novelty.The present invention has broken the way that local oscillator in traditional heterodyne reception technology must place receiving terminal, and sending a reference light wave that is equivalent to the local oscillator ripple simultaneously at transmitting terminal and signal light-wave, reference light wave and signal light-wave can be by producing behind the same light source shift frequency.Therefore, very low to the frequency stability requirement of lasing light emitter, the environment for use of system requires also not high, and has higher signal to noise ratio.System can directly adopt technology such as frequency modulation, phase modulation, during for the two places communication, and can be only with a light source.
Description
Optical self-heterodyne communication system belongs to the optical communication technology field.
The conventional method of existing optical heterodyne reception technique is equipped with local oscillator at receiving terminal, produces an intermediate frequency electrical signal wave behind received signal light wave and the local oscillator optical wave-mixing, realizes the optical heterodyne communication through processes such as intermediate frequency amplification, demodulation again.This method requires very high to the frequency stability of local oscillator light source and signal optical source.Simultaneously, because the variation of polarization state in the Optical Fiber Transmission is difficult to realize high efficiency heterodyne reception effect that Japan Patent (clear and 59-122140A) " optical heterodyne detection device " is though solved the stable problem of polarization state, but equipment is very complicated, environment for use is required very harsh.
The object of the present invention is to provide a kind of equipment simple, to the frequency stability and the lower light communication system of environment for use requirement of light source.
The present invention adopts the optical self-heterodyne means of communication, cancelled the local oscillator of receiving terminal, reach the reference light wave that differs certain frequency with it and send signal carrier simultaneously at transmitting terminal, this just is equivalent to local oscillator has been moved on to transmitting terminal, by optical fiber signal light-wave and reference light wave are propagated into receiving terminal simultaneously, promptly two-beam is propagated in a linear element simultaneously.Therefore, only need the two-beam direct conversion just can be obtained the intermediate frequency electric signal, put in the warp again, demodulation just can obtain the information transmitted at receiving terminal.The real system checking of this method is feasible.
Reference light wave and signal light-wave differ certain radio wave frequency, and it can be by obtaining behind the frequency shifter shift frequency.For example, when adopting the acousto-optic modulator shift frequency, light source obtains first-order diffraction light and zero order light behind acousto-optic modulator, and the latter can be as the reference light wave.In order to increase receiving sensitivity, reference light wave can improve power in the receiving terminal amplification or by mode-locked laser.
The present invention is carrying out two places when sending signal mutually, transmitting terminal and receiving terminal can each with a lasing light emitter, a lasing light emitter that also can adopt transmitting terminal as send and the reception two places shared.
Compared with the prior art the present invention has the following advantages:
1. the greatest difficulty of optical heterodyne is too high to the frequency stability requirement of signal light-wave and local oscillator light wave, reach the frequency stability requirement of optical heterodyne communication, complex apparatus must be arranged, and very strict to the requirement of environment for use, thereby generally do not use as yet at present.The present invention adopts the self-heterodyne method, thereby has avoided the strict demand to the lasing light emitter frequency stability, makes the optical heterodyne mechanics of communication feasible method that becomes a reality.
2. because the realization of optical self-heterodyne mechanics of communication can make transmission range increase greatly; Can make frequency modulation, phasing technique in the telecommunication technology be directly used in optical communication.
3. reference light and flashlight are gained behind the same light beam shift frequency, and the intrinsic noise spectrum of lasing light emitter is present in signal light-wave and reference light wave simultaneously, so can eliminate after mixing.
4. system's device therefor is very simple, is easy to realize that light is integrated.
Fig. 1 is each optical fiber self-heterodyne communication system schematic diagram with a lasing light emitter of two places.
Fig. 2 is the optical fiber self-heterodyne communication system schematic diagram of the shared lasing light emitter in two places.
The present invention can take following scheme implementation:
Embodiment 1: Fig. 1 expresses the block diagram of self-heterodyne optical communication.The light beam that lasing light emitter [1] sends, through producing zero order light and first-order diffraction light behind acousto-optic modulator [2] shift frequency, its medium frequency is f
oZero order light as the reference light wave; Frequency is (f
o± f
a) first-order diffraction light as signal light-wave, f
aBe the modulated signal frequency in the ultrasound-driven source [3] of acousto-optic modulator [2], as the electric carrier frequency of primary signal.The signal light-wave and the reference light wave that come out from acousto-optic modulator are coupled to the same optical fiber [4] simultaneously, be transferred to the optical heterodyne frequency mixer (for example PIN photoelectric device) [5] of receiving terminal, obtain an intermediate-freuqncy signal (the electric carrier wave of primary signal) after the mixing, after intermediate frequency amplifier [6] amplification, input demodulated equipment [7], thus demodulate the primary signal that transmitting terminal is sent here.In like manner, receiving terminal can take same method that signal is transferred to original sender.
Embodiment 2: Fig. 2 expresses the self-heterodyne optical communication block diagram of the shared lasing light emitter in two places.Wherein the transmission of signal, transmission and receiving course are identical with embodiment 1, the lasing light emitter of shared transmitting terminal when just receiving terminal sends signal, receiving terminal enters frequency mixer [5] before at light wave, be introduced into a beam splitter [8], with part light wave input mixer [5], another part light beam input acousto-optic modulator [9], the frequency of establishing this light beam is F
o(comprise f
o, f
o± f
a), the modulated signal frequency of drive source [10] is f
b, the zero order light and the first-order diffraction light frequency that are come out by acousto-optic modulator [9] are F
oAnd F
o± f
b, as with reference to light and flashlight, be coupled to simultaneously in the optical fiber [4b] respectively, be transferred to the frequency mixer [11] of original sender, obtaining frequency after the mixing is f
bThe intermediate-freuqncy signal carrier wave, after amplifying through intermediate frequency amplifier [12], input demodulated equipment [13], thereby demodulate the signal that former receiving terminal is sent here.In order to increase receiving sensitivity, reference light wave can adopt increase power such as mode-locked laser.
Claims (4)
1, a kind of light communication system that adopts the self-heterodyne method, the receiving terminal that it is characterized in that system has been cancelled local oscillator, differ the reference light wave of certain frequency and send one simultaneously with signal light-wave at transmitting terminal, reference light wave and signal light-wave are coupled to the optical heterodyne frequency mixer that is transferred to receiving terminal in the same optical fiber simultaneously, obtain the electric carrier wave of primary signal after the mixing, amplify through intermediate frequency again, obtain primary signal after the demodulation.
2,, it is characterized in that the reference light wave of transmitting terminal can obtain with frequency shifter (for example acousto-optic modulator) according to the system described in the claim 1.
3,, can take same light source shared when it is characterized in that the two places communication as two places according to the system described in claim 1 or 2.
4, system according to claim 3 is characterized in that reference light wave can adopt raising power such as mode-locked laser, increases receiving sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106306 CN86106306A (en) | 1986-09-12 | 1986-09-12 | Optical self-heterodyne communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106306 CN86106306A (en) | 1986-09-12 | 1986-09-12 | Optical self-heterodyne communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86106306A true CN86106306A (en) | 1987-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86106306 Pending CN86106306A (en) | 1986-09-12 | 1986-09-12 | Optical self-heterodyne communication system |
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| Country | Link |
|---|---|
| CN (1) | CN86106306A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067331A (en) * | 2012-12-12 | 2013-04-24 | 华中科技大学 | Quadrature amplitude modulation (QAM) light vector signal production and distance heterodyne detection device |
-
1986
- 1986-09-12 CN CN 86106306 patent/CN86106306A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067331A (en) * | 2012-12-12 | 2013-04-24 | 华中科技大学 | Quadrature amplitude modulation (QAM) light vector signal production and distance heterodyne detection device |
| CN103067331B (en) * | 2012-12-12 | 2015-05-20 | 华中科技大学 | Quadrature amplitude modulation (QAM) light vector signal production and distance heterodyne detection device |
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