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OSNR Monitoring Method for OOK and DPSK Based on Optical Delay Interferometer

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6 Author(s)

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:19 ,  Issue: 15 )

Date of Publication:

Aug.1, 2007

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