Abstract

One role for fiber optics and integrated optics that has continued to grow in significance is analog signal transmission. In cable television distribution, for instance, “conventional” fiber-based systems deliver > 50 channels of AM video with > 50 dB S/N to the user. Given the existing analog television receiver base, one can predict that analog transmission will coexist with digital channels for some time to come. Other applications of high performance analog links fall into the broader category of antenna remoting. It is indeed possible today to design and build an antenna remoting subsystem with several GHz bandwidth, 4–5 dB noise figure , and high spur free dynamic range (SFDR) > 110 dB/Hz2/3. Analog antenna remoting subsystems can be integrated into a variety of analog systems such as radar , cellular systems, and RF or microwave networks. Two factors that limit the dynamic range in fiber optic links are the system noise, predominantly from the laser relative intensity noise and the photodetector shot noise, and the non-linearity of the modulation process. The receiver noise level is reduced significantly using high-power solid state or DFB lasers (with > 20 mW output power and RIN < 165 dB/Hz). With noise levels approaching quantum limited performance, attention has recently focused on improving the linearity of the modulation process.

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