Title :
Precise in-band OSNR and spectrum monitoring using high-resolution swept coherent detection
Author :
Tian, Xiangqing ; Su, Yikai ; Hu, Weisheng ; Leng, Lufeng ; Hu, Peigang ; He, Hao ; Dong, Yi ; Yi, Lilin
Author_Institution :
State Key Lab. of Adv. Opt. Commun. Syst. & Networks, Shanghai Jiao Tong Univ., China
Abstract :
We propose and demonstrate a novel in-band optical signal-to-noise-ratio (OSNR) and spectrum monitoring technique based on swept coherent detection. This technique measures the signal and the in-band amplified spontaneous emission spectra by properly adjusting the polarization states of the signal and the local oscillator. A high resolution of 0.002 nm is achieved. By integrating the detected spectra of the signal and the noise, the in-band OSNR can be obtained in a very precise manner. We monitor the OSNR values with high accuracy in the range of 10-30 dB.
Keywords :
optical fibre networks; optical fibre polarisation; superradiance; wavelength division multiplexing; amplified spontaneous emission spectra; high-resolution detection; in-band OSNR; local oscillator; optical resolution; optical signal-to-noise-ratio; polarization states; spectrum monitoring; swept coherent detection; wavelength division multiplexing networks; Bragg gratings; Fiber gratings; Filtering; Monitoring; Optical attenuators; Optical filters; Optical noise; Optical polarization; Signal to noise ratio; Stimulated emission; Coherent detection; optical performance monitoring; optical signal-to-noise-ratio (OSNR); spectral analysis;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.859185
