Title :
OSNR Monitoring Method for OOK and DPSK Based on Optical Delay Interferometer
Author :
Liu, X. ; Kao, Y.-H. ; Chandrasekhar, S. ; Kang, I. ; Cabot, S. ; Buhl, L.L.
Author_Institution :
Alcatel-Lucent, Holmdel
Abstract :
We describe a simple method to measure the optical signal-to-noise ratio (OSNR) of on-off-keying (OOK) and differential phase-shift-keying (DPSK) signals by using an optical delay interferometer (ODI) having a sinusoidal and tunable passband. This OSNR monitoring method is independent of chromatic dispersion, polarization-mode dispersion, and noise polarization. We show experimentally that accurate OSNR measurements are made for a 10-Gb/s OOK signal by using a 1-bit ODI and a 40-Gb/s DPSK signal by using a partial-bit ODI with the OSNR ranging from 5 to 25 dB.
Keywords :
differential phase shift keying; light interferometers; optical delay lines; optical fibre networks; DPSK; OOK; OSNR monitoring; bit rate 10 Gbit/s; bit rate 40 Gbit/s; differential phase shift keying; noise figure 5 dB to 25 dB; on-off-keying; optical delay interferometer; optical signal-to-noise ratio; sinusoidal passband; tunable passband; Delay; Differential quadrature phase shift keying; Monitoring; Optical interferometry; Optical noise; Passband; Phase measurement; Phase shift keying; Phase shifting interferometry; Signal to noise ratio; Differential phase-shift keying (DPSK); optical delay interferometer (ODI); optical signal-to-noise ratio (OSNR); performance monitoring;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.901586
