Abstract
There are three dominant noise mechanisms in an analog optical fiber link. These are shot noise that is proportional to the mean optical power, relative intensity noise (RIN) that is proportional to the square of the instanteaneous optical power. This report describes an adaptive noise cancellation of these dominant noise processes that persist an analog optical fiber link. The performance of an analog optical fiber link is analyzed by taking the effects of these noise processes. Analytical and simulation results show that some improvement in signal to noise ratio (SNR) and this filter is effective to remove noise adaptively from the optical fiber link.
Highlights
Fiber optic link is used for the transm ission of digital signals and is used for many potential applications of analog links
We will analyze three dominant noise mechanisms in an analog optical fiber link. These are shot noise that is proportional to the mean optical power, relative intensity noise {RIN) that is proportional to the square of the instantaneous optical power and thermal noise that is a function of absolute temperature and independent of the optical power
Substituting for the shot noise, therm al noise and RIN noise we find the signal to noise ratio (SNR) at the photodetector is given by [1]
Summary
Fiber optic link is used for the transm ission of digital signals and is used for many potential applications of analog links. Analog optical links are important for transmission of signals over long distances due to the low loss of optical fiber. These range from individual voice channels (4KHz) to microwave links operating in Giga Hertz region. Noise in optical fiber link can be eliminated by (i) filters that are designed based on prior information and kept fixed in receiver (The receiver filter used for after detection to suppress the out o f band noise is a typical example) or (ii) it may be Reproduced with perm ission of the copyright owner.
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