Abstract
We describe a novel method of measuring PMD (polarization mode dispersion) of an in-service DWDM system by PMD compensation. We successfully demonstrate the method in a 1500-km ultra-long haul DWDM test bed. We further verify the feasibility of the method for in-service light path PMD monitoring in a field trial in a revenue-generating route in Verizon Network, and obtain an accurate PMD value without impacting live network traffic. The discrepancy between the measured and expected PMD values is less than 6% for all cases tested.
Highlights
As the bit rate of fiber optic communication systems increases from 10 Gbps to 40Gbps, 100 Gbps [1], and beyond, polarization mode dispersion (PMD) has more and more impact on signal transmission [2,3,4,5]
The instantaneous PMD value of each emulator at each wavelength channel is expected to change with time due to temperature variations and the changing rate is on the order of several ps per minutes in an air-conditioned laboratory environment
When the test signal is injected into an idle port, the DWDM system adjusts its optical gain in each amplifier to accommodate the added signal
Summary
As the bit rate of fiber optic communication systems increases from 10 Gbps to 40Gbps, 100 Gbps [1], and beyond, polarization mode dispersion (PMD) has more and more impact on signal transmission [2,3,4,5]. For a fiber link with multiple WDM signal channels, the instant PMD values of different signal channels (or wavelengths) may differ, they all follow the same Maxwellian Distribution with the same average PMD value if monitored for a sufficiently long period of time, generally tens of hours. The relative error between the measured and expected PMD values is less than 6% for all the cases tested We anticipate that this method is effective in monitoring PMD in a fiber link having an average PMD larger than 5 ps. Received 29 Oct 2010; revised 5 Dec 2010; accepted 5 Dec 2010; published 10 Dec 2010 20December 2010 / Vol 18, No 26 / OPTICS EXPRESS 27308
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