Title :
Novel Optical Phase Demodulator Based on a Sampling Phase-Locked Loop
Author :
Zibar, Darko ; Johansson, Leif A. ; Chou, Hsu-Feng ; Ramaswamy, Anand ; Rodwell, Mark ; Bowers, John E.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA
fDate :
5/1/2007 12:00:00 AM
Abstract :
A novel phase-locked coherent demodulator, based on a sampling phase-locked loop, is presented and investigated theoretically. The demodulator is capable of operating at high frequencies, by using optical sampling to downconvert the high-frequency input radio-frequency signal to the frequency range of the baseband loop. We develop a detailed theoretical model of the (sampling) phase-locked coherent demodulator and perform detailed numerical simulations. The simulation results show that the operation of the sampling demodulator resembles the operation of the baseband demodulator for very short optical pulses (<2 ps). Furthermore, we investigate how the signal-to-noise ratio of the demodulator is affected by timing and amplitude jitter of the pulsed optical source
Keywords :
demodulators; microwave photonics; optical modulation; phase locked loops; phase modulation; sampling methods; timing jitter; amplitude jitter; baseband loop; coherent demodulator; high-frequency signal; microwave photonics; optical phase demodulator; optical sampling; phase-locked demodulator; pulsed optical source; radiofrequency signal; sampling demodulator; sampling phase-locked loop; short optical pulses; signal-to-noise ratio; timing jitter; Baseband; Demodulation; Numerical simulation; Optical pulses; Phase locked loops; RF signals; Radio frequency; Sampling methods; Signal to noise ratio; Timing jitter; Analog links; coherent; microwave photonics; modulators; phase-locked loop (PLL); phase-modulation; sampling;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.895053
