Abstract
Recently, degree of polarization (DOP) of light has been utilized as a parameter to monitor optical signal-to-noise-ratio (OSNR). However, in the presence of polarization-mode dispersion (PMD), when using DOP to determine OSNR, OSNR is always underestimated due to the depolarization effect induced by PMD. In this paper, we propose and experimentally demonstrate a simple PMD-insensitive OSNR monitoring technique based on DOP measurement. By the assistance of the transmitter-side polarization scrambling, the in-service OSNR parameter can be accurately derived from the measured maximum DOP value within the polarization scrambling period, which is immune to PMD effect. The monitoring performance is experimentally evaluated by statistical method at OSNR of 25 dB. Experimental results show that OSNR monitoring with about 1-dB standard deviation can be achieved in a 10-Gb/s NRZ-OOK system with DGD varying from 0 to 80 ps.
Highlights
Optical signal-to-noise-ratio (OSNR) has been vigorously pursued as an important performance parameter in future high-speed (≥10 Gb/s) reconfigurable optical networks
The monitoring scheme based on degree of polarization (DOP) measurement offers many noteworthy advantages as it is simple, insensitive to chromatic dispersion, scalable to higher bit-rate systems, and obviates high-speed electronics [1,2]
As DOP is affected by both OSNR and polarization-mode dispersion (PMD) [7,8], OSNR will be underestimated in the presence of PMD when DOP is chosen as the monitored parameter for OSNR
Summary
Optical signal-to-noise-ratio (OSNR) has been vigorously pursued as an important performance parameter in future high-speed (≥10 Gb/s) reconfigurable optical networks. The monitoring scheme based on degree of polarization (DOP) measurement offers many noteworthy advantages as it is simple, insensitive to chromatic dispersion, scalable to higher bit-rate systems, and obviates high-speed electronics [1,2]. A PMD-insensitive DOP-based OSNR monitoring scheme has been proposed and experimentally demonstrated [7][9]. We demonstrate that, by applying a polarization scrambler at the transmitter side, OSNR can be and accurately monitored using a conventional DOP analyzer. This proposed method makes the DOP-based OSNR monitoring technique more practical for deployment in real systems with non-negligible PMD. The high-order PMD involved in the system is assumed to be negligible in this paper
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