Title :
A compensation method for dispersion-induced third-order intermodulation distortion using an etalon
Author :
Kaneko, Shin-ichi ; Adachi, Akihiro ; Yamashita, Jun-ichiro ; Watanabe, Hiromitsu
Author_Institution :
Inf. Technol. R&D Centre, Mitsubishi Electr. Corp., Kanagawa, Japan
fDate :
12/1/1996 12:00:00 AM
Abstract :
A method to compensate dispersion-induced third-order intermodulation distortion (IM3CD) in subcarrier multiplexing (SCM) optical transmission systems is proposed. It is confirmed theoretically and experimentally that IM3CD can be compensated by interference-induced third-order intermodulation distortion (IM3IN). Simple analytic expressions of IM3CD and IM3IN are derived from the same expression of optical electric field which includes exact phase term taking into account the phase of laser chirp. From the theoretical analyses, we clarified the conditions of IM3CD-compensation. IM3IN can be easily generated by an etalon which is a kind of interferometer and a optical glass plate. More than 30 dB of IM3CD -compensation was achieved, and IM3CD-compensation was achieved regardless of the transmission distance by adjusting tilt angle of the etalon. Using this method, high quality signal transmission can be realized even though the wavelength of laser diode (LD) is not coincident with the fiber zero dispersion wavelength
Keywords :
chirp modulation; compensation; intermodulation distortion; light interferometers; optical fibre communication; optical fibre dispersion; optical modulation; semiconductor lasers; subcarrier multiplexing; IM3CD-compensation; SCM optical transmission systems; compensation method; dispersion-induced third-order intermodulation distortion; etalon; exact phase term; fiber zero dispersion wavelength; high quality signal transmission; interference-induced third-order intermodulation distortion; laser chirp phase; laser diode wavelength; optical electric field; subcarrier multiplexing; tilt angle; transmission distance; Chirp; Delay; Frequency modulation; Intensity modulation; Interference; Intermodulation distortion; Optical distortion; Optical interferometry; Optical modulation; Phase modulation;
Journal_Title :
Lightwave Technology, Journal of
