Signal Detection in Laser-Based Systems
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چکیده
The main objective of this dissertation is to optimize system performance at the photodetection end. Since the optical signal is typically at its weakest power level when it arrives at the receiver, it is important to account for the various noise mechanisms which affect the signal-to-noise ratio (SNR) and degrade the fidelity of the communicated waveform. This chapter presents a brief discussion on the detection and amplification schemes commonly used in optical fiber systems. System performance, as characterized by the average receiver sensitivity (in photons/bit) is analyzed for both On-Off Keying (OOK) and Frequency-Shift Keying (FSK) transmission, for both PIN and optical preamplifier receivers. This analysis provides us with a reference with which to compare the performance of noise-like, spectrum-sliced systems, provided in later chapters.
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