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Summary form only given. The ordinary Er-doped fiber amplifiers (EDFAs) are constructed using several discrete components, including a pump laser diode (LD) packaged in a butterfly or TO package, a fused biconical WDM coupler, a fiber pigtailed isolator, a large size beam splitter and a packaged photodetector (PD).
A coherent optical heterodyne CPFSK receiver with a limiter discriminator (LD) detector, which cannot be degraded by the quantum phase noise of lasers when the frequency deviation ratio h is equal to unity is proposed. The receiver can give the same bit error rate as the ideal digital DPSK system. The expression /sup 1///sub 2/ exp (-SNR) can be considered the upper bound of the minimum error rate...
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