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High‐resolution laser chirp measurement using quadrature sampling technique
Author(s) -
Song Minho,
Yin Shizhuo
Publication year - 1999
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19991220)23:6<335::aid-mop4>3.0.co;2-8
Subject(s) - chirp , interferometry , optics , physics , laser , sampling (signal processing) , quadrature (astronomy) , demodulation , amplitude modulation , frequency modulation , bandwidth (computing) , computer science , telecommunications , detector , channel (broadcasting)
A high‐resolution laser chirp diagnosing technique is proposed and experimentally demonstrated by quadrature sampling of a phase‐modulated Mach–Zehnder (M/Z) interferometer. A light signal from an injection current‐modulated DFB source passes through an M/Z interferometer whose output is sampled with quadrature time delay. Digital arctangent demodulation is used to extract the laser chirp information from the sampled data. To remove the amplitude modulation (AM) effect, the intensities were divided by the modulation signal. Using a 30 cm path unbalanced M/Z interferometer, an 84 kHz readout resolution in the 19 GHz range is demonstrated with frequency increase/decrease discerning capability. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 23: 335–337, 1999.