Abstract

We have demonstrated a record sensitivity of -37.0 dBm (38 photons/bit) for a BER of 10 -9 at 42.7-Gb/s using an integrated balanced optical front end. Results were obtained using optical preamplification of RZ-DPSK modulation and an external delay-interferometer. The OSNR requirement was measured to be 16.9 dB in a 0.1-nm bandwidth. The impact of polarization-mode dispersion (PMD) and chromatic dispersion on the optical front end performance has been measured. Performance for enhanced forward error correction has been projected based on 10 -3 BER performance.

© 2004 IEEE

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