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    Demonstration of 2.7-PPB Receiver Sensitivity Using PDM-QPSK With 4-PPM and Unrepeatered Transmission Over a Single 370-km Unamplified Ultra-Large-Area Fiber Span

Demonstration of 2.7-PPB Receiver Sensitivity Using PDM-QPSK with 4-PPM and Unrepeatered Transmission over a Single 370-km Unamplified Ultra-Large-Area Fiber Span

18 September 2011

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We demonstrate a record receiver sensitivity of 2.7 photons per bit at 6.23-Gb/s net data rate using PDM-QPSK with 4-ary-pulse-position-modulation. This signal is transmitted over a 370-km unrepeatered ultra-large-area-fiber span with 71.7-dB total loss budget. OCIS: (060.1660) Coherent communications; (060.5060) Phase modulation; (060.2605) Free-space optical commun.

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