Title :
Polarization mode dispersion detected by arrival time measurement of polarization-scrambled light
Author :
Noé, R. ; Sandel, D. ; Mirvoda, V. ; Wüst, F. ; Hinz, S.
Author_Institution :
Opt. Commun. & High-Frequency Eng., Paderborn Univ., Germany
fDate :
2/1/2002 12:00:00 AM
Abstract :
Polarization mode dispersion (PMD) limits optical fiber capacity. PMD compensators usually minimize the associated eye closure. This measure scales with the square of the differential group delay (DGD) and makes it difficult to detect low DGDs. However, light with a low-speed polarization modulation suffers arrival time variations, in the presence of PMD, that are proportional to the DGD. These are detected by integrating the voltage-controlled oscillator (VCO) input signal of the clock recovery phase-locked loop (PLL). This novel method has been demonstrated for 40 Gb/s nonreturn-to-zero (NRZ) and for 2×40 Gb/s return-to-zero (RZ) polarization division multiplex transmission. PMD detection sensitivities range between 2 ps and 84 fs
Keywords :
multiplexing; optical fibre communication; optical fibre dispersion; optical fibre polarisation; optical fibre testing; optical fibre theory; optical modulation; phase locked loops; sensitivity; synchronisation; voltage-controlled oscillators; 2 ps to 84 fs; 40 Gbit/s; PMD compensators; arrival time measurement; arrival time variations; clock recovery phase-locked loop; differential group delay; eye closure; low-speed polarization modulation; nonreturn-to-zero polarization division multiplex transmission; optical fiber capacity; polarization mode dispersion; polarization mode dispersion compensators; polarization-scrambled light; return-to-zero polarization division multiplex transmission; sensitivities; voltage-controlled oscillator input signal; Clocks; Delay; Optical fiber polarization; Optical fibers; Optical modulation; Phase detection; Phase locked loops; Polarization mode dispersion; Time measurement; Voltage-controlled oscillators;
Journal_Title :
Lightwave Technology, Journal of
