Interactive phase modulation(Cross phase Modulation, abbreviated as XPM)Cross phase modulationWhen two or more channels use different frequenciesOptical fiberThe nonlinear optical effect caused by the light field itself when propagating in the.
Interactive phase modulation(Cross phase Modulation, abbreviationXPM）[1], and translatedCross phase modulationWhen two or more channels use different frequencies to propagate in the fiber at the same time, the nonlinear optical effect caused by the light field itself.
In short, a particular wavelength of light can beNonlinearThe optical Kerr effect affects the radio wave polarization phase of another light wave with different wavelengths.
applicationInteractive phase modulationIn a coherent target beam, another incident beam can be used to make two beams simultaneously propagate in a specific nonlinear medium, changing the phase of the target beam;With this, additional information to be transmitted can be added so that the target beam can transmit signals.This technology has been applied in optical fiber communication technology.
Interactive phase modulationIt has been applied to dense wavelength division multiplexing technology.Use intensity modulation and direct detectionInteractive phase modulationeffect.First, in the coherent target beam, the second incident beam moves simultaneously, and the signal is added by phase modulation.Then, using the dispersion effect of light, the phase modulation is converted into the power difference distribution caused by the signal carried in the target beam.However, the light dispersion effect in the medium may also cause the signal channel to lose some signals, reducingInteractive phase modulationeffect.
Advantages and disadvantages of interactive phase modulation technology
Announce
edit
advantage
1) Nonlinear Pulse Compression
2) Passive mode locking
3) Ultra fast optical switching
4) Demultiplexing of OTDM channels
5) Wavelength conversion of WDM channels
shortcoming
1) It is easy to cause signal crosstalk in different channels in wavelength division modulation.XPM leads to interchannel crosstalk in WDM systems
2) It is easy to cause signal jitter in intensity and timing.It can produce amplitude and timing jitter
Application of interactive phase modulation
Announce
edit
Cross phase modulationThe light that can be used to act on adding information to the technique in question can be used to modify the coherence of one of the stream phases by interacting with another beam in an appropriate nonlinear medium.This technology is suitable for optical fiber communication.
XPM is one of the most commonly used quantum non burst measurement techniques.
Other beneficial applications of XPM include:
1) Ultrashort pulse compressed by nonlinear optical pulse;
2) Passive mode locking;
3) Demultiplexing of ultra fast optical switch OTDM channel;
