摘要
We demonstrate a novel 40-Gb/s transmission system over a 10×101-km standard single mode fiber （SSMF） loop. This system features polarization multiplexed quadrature phase shift keying （PolMux-QPSK）, lowvoltage modulation of 2-V peak-to-peak signal amplitude, and home-made 90° optical hybrid with singleended digital coherent detection. Any power amplifers before the modulator and balanced detectors are not used. In the case of low-voltage modulation, coherent detection is much less sensitive to modulator bias offset than delay interferometer-based demodulation.
We demonstrate a novel 40-Gb/s transmission system over a 10×101-km standard single mode fiber （SSMF） loop. This system features polarization multiplexed quadrature phase shift keying （PolMux-QPSK）, lowvoltage modulation of 2-V peak-to-peak signal amplitude, and home-made 90° optical hybrid with singleended digital coherent detection. Any power amplifers before the modulator and balanced detectors are not used. In the case of low-voltage modulation, coherent detection is much less sensitive to modulator bias offset than delay interferometer-based demodulation.
基金
supported in part by the National Natural Science Foundation of China (No. 60932004)
the "863" Project of China (Nos. 2009AA01Z223 and 2009AA01Z253)
the Open Fund of the Key Lab-oratory of Information Photonics and Optical Commu-nications (Beijing University of Posts and Telecommu-nications), Ministry of Education
