October 2017
Intermediate to advanced
592 pages
20h 47m
English
Content preview from Analysis and Design of Transimpedance Amplifiers for Optical Receivers
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Appendix A
Communication Signals
In this appendix, we review the non-return-to-zero (NRZ) signal, the return-to-zero (RZ) signal, the pulse amplitude-modulated (PAM) signal, the amplitude-modulated signal with vestigial sideband (AM-VSB) for analog television, and the quadrature amplitude-modulated (QAM) signal for digital television. For each signal we discuss the signal power, the power spectral density (PSD), the bandwidth, and the required signal-to-noise ratio (SNR). A partial summary of the results is given in Table A.1. Furthermore, we show how the notation and expressions typically found in the literature on optical communication relate to those found in the literature on communication systems such as [1–5].
Table A.1 Bandwidth and SNR requirement for some digital communication signals
| Signal | Bandwidth (DC to null) | SNR requirement for  |
| NRZ |  |
16.9 dB |
| 50%-RZ |  |
15.7 dB |
| 4-PAM |  |
23.9 dB |
A.1 Non-Return-to-Zero Signal
The NRZ signal is illustrated in Fig. A.1 with a voltage waveform. The signal is characterized by the swing , the mean value (or DC component) , and the ...
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