Abstract
An ultrashort rate-1/2 parity check (PC) code is used to switch the net data rate of a coherent quadrature phase shift keying (QPSK) transmission system to the equivalent of a binary phase shift keying (BPSK) system. Simulation results of PC encoded-QPSK show an improvement in receiver sensitivity of 0.8 dB over BPSK at the soft-FEC threshold of BER = 2×10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-2</sup> . In addition, the code allows establishing an absolute phase reference at the receiver; i.e., differential coding is not required.
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