Polarization mode dispersion detected by arrival time measurement of polarization-scrambled light

• Published in: Journal of lightwave technology Vol. 20; no. 2; pp. 229 - 235
• Main Authors: Noe, R., Sandel, D., Mirvoda, V., Wust, F., Hinz, S.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.02.2002; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Arrivals; Circuit properties; Clocks; Delay; Division; Electric, optical and optoelectronic circuits; Electronics; Exact sciences and technology; Group delay; Integrated optics. Optical fibers and wave guides; Multiplexing; Optical and optoelectronic circuits; Optical fiber polarization; Optical fibers; Optical modulation; Phase detection; Phase locked loops; Polarization mode dispersion; Polarization modulation; Time measurement; Voltage-controlled oscillators; Optical transmission; Eye diagram; Optical fiber communication; Delay time; Modal dispersion; Signal detection; Optical fiber dispersion; Polarization mode
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/50.983236

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/spl times/40 Gb/s return-to-zero (RZ) polarization division multiplex transmission. PMD detection sensitivities range between 2 ps and 84 fs.