Title :
Analysis of direct-detection DPSK signal with homodyne crosstalk
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan
Abstract :
When a differential-phase-shift-keying (DPSK) signal is directly detected using an asymmetric interferometer and balanced receiver, the exact error probability of the signal with homodyne crosstalk is derived analytically. Homodyne crosstalk from many interferers is Gaussian distributed, but the Gaussian model overestimates the signal-to-noise ratio (SNR) penalty for homodyne crosstalk from a single interferer. For the DPSK signal, the crosstalk ratio for a 1-dB SNR penalty must be less than -16.5 dB. For the same crosstalk ratio, the SNR penalty for a DPSK signal is far smaller than that for an ON-OFF keying (OOK) signal.
Keywords :
Gaussian distribution; differential phase shift keying; error statistics; homodyne detection; light interferometry; optical crosstalk; optical receivers; DPSK signal analysis; Gaussian distribution; Gaussian model; SNR penalty; asymmetric interferometer; balanced receiver; crosstalk ratio; differential-phase-shift-keying; direct-detection DPSK; error probability; homodyne crosstalk; signal-to-noise ratio penalty; Differential quadrature phase shift keying; Error probability; Gaussian approximation; Optical crosstalk; Optical fiber networks; Optical filters; Optical polarization; Optical receivers; Optical sensors; Signal analysis; Differential-phase-shift-keying (DPSK); error probability; homodyne crosstalk;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2005.854040
