APPARATUS AND METHOD FOR MONITORING IN-BAND OSNR

摘要

An apparatus and a method for monitoring in-band OSNR (Optical Signal-to-Noise Ratio) which monitors the in-band OSNR by using two parallel Mach-Zehnder-interferometers with different optical time delays are disclosed. The apparatus and method can be resistant to chromatic dispersion, polarization mode dispersion and polarized noise, can measure the coherence characteristics of the signal without removing the noise, and can be manufactured into a semiconductor integrated device and be applied in the future high-speed optical network.

主权项

1. An apparatus for monitoring in-band OSNR (Optical Signal-to-Noise Ratio) configured by a parallel Mach-Zehnder interferometer, including:
a 1×3 coupler, at the input terminal of which is a Wavelength-Division-Multiplexing (WDM) optical signal to be monitored; a first delay arm, a second delay arm and a common arm, each of which is connected to one of the three output terminals of the coupler, wherein the common arm is comprised of a phase modulator and a first 3 dB coupler which are connected in series, the first and second delay arms having different values of time delay; a second 3 dB coupler and a third 3 dB coupler, wherein the two input terminals of the second coupler are connected to the output terminal of the first delay arm and one of the two output terminals of the first coupler respectively, and the two input terminals of the third coupler are connected to the output terminal of the second delay arm and the other of the two output terminals of the first coupler respectively; and a first optical power meter and a second optical power meter, connected to the output terminals of the second coupler and the third coupler respectively.