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

Volume

19

Issue

9

fYear

2007

fDate

5/1/2007 12:00:00 AM

Firstpage

686

Lastpage

688

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.895053

Filename

4147634