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The effect of interferometer phase error on direct-detection DPSK and DQPSK signals

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1 Author(s)
Keang-Po Ho ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taiwan

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 1 )