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A novel optical coherent receiver architecture for linear optical phase modulation based on mixed signal circuit concepts is presented. This approach relies on heterodyne optical-to-RF down-conversion and linear RF phase demodulation using an XOR gate, generating a linear phase response over +/-pi/2 modulation depth. Adding digital frequency division by a factor n before the phase detector increases...
A novel coherent receiver for linear optical phase demodulation is proposed and experimentally demonstrated. The receiver, based on a broadband optical phase-lock loop has a bandwidth of 1.45 GHz. Using the receiver in an analog link experiment, a spurious free dynamic range of 125 dBHz2/3 is measured at 300 MHz. Further, theoretical investigations are presented demonstrating receiver operation at...
A novel optical coherent receiver architecture for linear optical phase modulation is presented. A proof-of-concept demonstration has been performed using discrete components and at low frequency. High dynamic range has been confirmed at 3.13 mA average photocurrent; 124.3 dBHz2/3, corresponding to a 131.5 dBHz2/3 if a shot-noise limited noise floor were achieved (here limited by low-frequency 1/f-type...
We propose and demonstrate a novel coherent receiver with feedback for high-linearity analog photonic links. In the proposed feedback receiver, a local phase modulator tracks the phase change of the signal and reduces the effective swing across the phase demodulator without reducing the transmitted signal. The signal-to-noise-ratio is thus maintained while linearity is improved. Up to 20-dB improvement...
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