Heterodyne detection of CPFSK signals with and without wavelength conversion up to 5 Gb/s

Detection of wavelength converted signals by a coherent continuous-phase frequency-shift-keying receiver is reported. The signals are wavelength converted over 35 nm, and record receiver sensitivities of -38.7 dBm at 4.0Gb/s and -35.6 dBm at 4.8Gb/s are obtained. Comparison between results with and without wavelength conversion, relative to theory, shows a small penalty of less than 1.5dB. >