Title :
The effect of interferometer phase error on direct-detection DPSK and DQPSK signals
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taiwan
Abstract :
Based on the well-known Marcum´s Q function, closed-form formulae are derived to evaluate the error probability of direct-detected differential phase-shift keying (DPSK) and differential quadrature phase-shift keying (DQPSK) signals with interferometer phase error. For a signal-to-noise ratio penalty less than 1 dB, the phase error must be less than 16° and 6° for DPSK and DQPSK signals, respectively.
Keywords :
Mach-Zehnder interferometers; differential phase shift keying; error statistics; optical fibre communication; quadrature phase shift keying; wavelength division multiplexing; BER; Q function; asymmetric interferometer; closed-form formulae; correlation coefficient; differential quadrature phase-shift keying; direct-detected DPSK; error probability; interferometer phase error; long-haul transmission; path difference; signal-to-noise ratio penalty; Bit error rate; Differential quadrature phase shift keying; Error probability; Frequency; Matched filters; Phase detection; Phase shift keying; Phase shifting interferometry; Signal processing; Signal to noise ratio;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2003.819359
