A High Spectral Efficiency Coherent Microwave Photonic Link Employing Both Amplitude and Phase Modulation With Digital Phase Noise Cancellation

作者：Chen Xiang^*; Yao Jianping

来源：Journal of Lightwave Technology, 2015, 33(14): 3091-3097.

DOI：10.1109/JLT.2015.2419456

• Digital signal processing (DSP)
• high spectral efficiency
• laser phase noise
• microwave photonic link (MPL)
• optical coherent detection
• phase noise cancellation (PNC)

A high spectral efficiency coherent microwave photonic link (MPL) supporting amplitude and phase modulation incorporating a digital phase noise cancellation is proposed and experimentally demonstrated. At the transmitter, a continuous-wave light wave isamplitude- and phase-modulated by two microwave vector signals carried by a microwave carrier at an identical frequency. The modulated optical signal is polarization multiplexed with an unmodulated optical carrier and transmitted over a length of a single-mode fiber (SMF). At the receiver, the optical signal is detected coherently by a coherent receiver to which a local oscillator (LO) laser source is also applied. Through advanced digital signal processing, the microwave vector signals are recovered, and the phase noise introduced by both the transmitter laser source and LO laser source is cancelled. An experiment is performed. The transmission of a 2.5- Gb/s 16-QAM and a 1.25- Gb/ s QPSKmicrowave vector signals both at 2.5 GHz over a 25-km SMF is implemented. The total bit rate of the MPL is 3.75 Gb/s. The transmission performance of the MPL in terms of error vector magnitudes and bit error rates is evaluated.

• 出版日期2015-7-15