Abstract:

A simplified optical receiver architecture capable of tracking and demultiplexing polarization-multiplexed signals, dynamically compensating for PMD using a variety of polarization controller technologies, and reducing the number of delay line demodulators by two for both DPSK and DQPSK modulation is illustrated. Once polarization is stabilized at the first stage of the cascaded system of the present invention, subsequent stages can be simplified and cost reduced.

Description:

FIELD OF THE INVENTION

The present invention relates generally to optical receivers, and more particularly, to systems and methods for a simplified optical receiver architecture capable of tracking and demultiplexing polarization-multiplexed signals, dynamically compensating for Polarization Mode Dispersion (PMD) using a variety of polarization controller technologies, and reducing the number of delay line demodulators by two for both Differential Phase Shift Keying (DPSK) and Differential Quadrature Phase Shift Keying (DQPSK) modulation.

BACKGROUND OF THE INVENTION

Conventional fiber optic communication systems are well-developed for transmitting high-data rate signals, such as 10 Gbps and 40 Gbps signals. However, these high data rates are being pushed towards ever increasing speeds due to rapid growth in networks. For example, current standards bodies (e.g., IEEE) are considering data rates of 100 Gbps, which would require ever higher transmission rates (i.e., approximately 112 Gbps), once forward error correction (FEC) and framing (e.g., G.709) overheads are considered. Other standards bodies, such as ITU-T, are considering data rates of 120 Gbps, again requiring even higher transmission rates (i.e., approximately 130 Gbps). Such high data rates are beyond the limit of conventional electronics and optics. For example, conventional systems utilize a direct binary modulation scheme. Disadvantageously, direct bin ...

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