In-band OSNR monitoring using a pair of Michelson fiber interferometers.
Two polarization-independent Michelson fiber interferometers with different optical delays were used to measure the in-band OSNR of an optical signal from 5 to 30 dB within an accuracy of 0.5 dB. Using an expansion of the amplitude autocorrelation function of the signal around zero delay, it was possible to perform measurements without any prior knowledge of the signal. The system is shown to be immune to the effects of modulation frequency (up to 10G), partially and fully polarized noise, chromatic dispersion and poorly biased modulators.
Flood
E
E
Semiconductor Photonics Group, School of Physics, Trinity College, Dublin 2, Ireland. floodea@tcd.ie
Guo
W H
WH
Reid
D
D
Lynch
M
M
Bradley
A L
AL
Barry
L P
LP
Donegan
J F
JF
D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007368:Interferometry / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*