This paper describes a coherent optical receiver, ELO. 1 ELO where drifts of the carrier phase and state of polarization are L E (2) estimated with digital signal processing. The complex amplitude LO,y 2 J jLO of the signal is entirely restored with such receiver. where ELO is the constant amplitude of LO. The 90' optical hybrids in Fig.1 generate electric fields E1. .8 at double balanced

With continuing progress in VLSI and ASIC technologies, digital signal processing (DSP) algorithms have continued to find great use in increasingly wide application areas. DSP has gained popularity also in embedded systems although these systems set challenging constraints for implementations. Embedded systems contain limited resources, thus embedded DSP systems must balance tradeoffs between t...

Signals can be divided into three categories: continuous-time (analog) signals, discrete-time signals, and digital signals. The signals that we encounter daily are mostly analog signals. These signals are defined continuously in time, have an infinite range of amplitude values, and can be processed using analog electronics containing both active and passive circuit elements. Discrete-time signa...

(b) There are several ways to construct linear-phase FIR filters, including windowing the IDTFT of an ideal response, but in order to ensure a minimax-optimal filter (i.e., a filter that minimizes the maximum deviation from a piecewise-constant ideal specification), the way we know is via the Parks-McClellan approach. In fact. this filter was designed in Matlab as: >> h = firpm(8, [0 0.55 0.65 ...

It is foreseeable that the 100 Gb/s/ $\lambda$ and beyond passive optical network (PON) will be required in future access networks to meet explosive growth of data traffic. The coherent systems could a promising solution for 100G PON. C...