ABSTRACT
It has been shown that a balanced optical receiver can suppress the excess noise intensity generated from the local oscillator (LO) [1-3]. In a balanced receiver, an optical coupler is employed to mix a weak optical signal with a LO field of average powers of ES2 and EL2, respectively. Figure 5.1 shows the generic diagram of a balanced optical receiver under a coherent detection scheme in which two photodetectors and amplifiers are operating in a push-pull mode.
