Technical Bulletin N°9

Experts in Next Generation Lightwave Test Equipment

Polarization multiplexed signals measurement with the AP2440A series Optical Complex Spectrum Analyzer

Optical Complex Spectrum Analyzer AP2440A application note

Introduction : Polarization multiplexing (PolMux) is becoming an attractive solution for doubling fiber data transfer capacity : Two independent signals are simultaneously transmitted on two orthogonal polarization states. The combination of QPSK and polarization multiplexing is therefore a promising technique since it can transmit the bit rate four times as large as the symbol rate, thus reducing exposure to fiber impairments like chromatic dispersion and polarization mode dispersion. Time-Polarization multiplexing or interleaving is also a technique used to reduce the nonlinear penalty and inter symbol interference resulting from chromatic dispersion and polarization-mode dispersion (PMD). With this technique, adjacent bits are orthogonally polarized. The polarization diversity design of the AP2440A series Optical Complex Spectrum Analyzers has a unique built-in feature, designed to analyze these two independently modulated signals, permitting life measurements of two orthogonal polarization states simultaneously. The below is a measurement example of two orthogonally polarized 40Gb/s NRZ-QPSK.

Phase measurement of two orthogonally polarized QPSK signals Markers1-2-3-4 on the red trace and on the blue trace represent the 4 different phase states of the QPSK modulated signal Back to the top

Polarization diversity design of the AP2440A OCSA : Back to the top

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