Title :
Second-order distortion of amplified intensity-modulated signals with chirping in erbium-doped fiber
Author :
Ohya, Jun ; Sato, Hisanao ; Mitsuda, Masahiro ; Uno, Tomoaki ; Fujita, Toshihiro
Author_Institution :
Semicond. Res. Center, Matsushita Electr. Ind. Co. Ltd., Osaka, Japan
fDate :
11/1/1995 12:00:00 AM
Abstract :
Second-order distortion produced in an erbium-doped fiber amplifier (EDFA) is investigated theoretically and experimentally. Rate equations for intermodulation products are led by the perturbation method. From numerical calculation, it is shown that optimum combinations of input power to EDFA and signal wavelength exist that give a distortion-free condition, Improvement of the composite second-order (CSO) distortion, which results from the cancellation of the laser distortion and the gain tilt induced distortion, was confirmed for VHF multichannel transmission. Furthermore, CSO distortion-free transmission in cascaded EDFA´s has been demonstrated for a 42-channel AM-SCM signal by experimentally determining the optimum operating condition of the EDFA such that each amplifier generates no additive distortion
Keywords :
amplitude modulation; chirp modulation; erbium; fibre lasers; intermodulation distortion; laser beams; optical fibre networks; perturbation theory; subcarrier multiplexing; visual communication; 42-channel AM-SCM signal; AM-SCM video transmission; CSO distortion-free transmission; EDFA; Er-doped fiber amplifier; VHF multichannel transmission; amplified intensity-modulated signals; cascaded EDFA; chirping; composite second-order distortion; distortion-free condition; gain tilt induced distortion; input power; intermodulation products; laser distortion; numerical calculation; optimum operating condition; perturbation method; rate equations; second-order distortion; signal wavelength; Chirp; Equations; Erbium-doped fiber amplifier; Laser noise; Nonlinear distortion; Optical distortion; Optical pumping; Quantum cascade lasers; Semiconductor lasers; Stimulated emission;
Journal_Title :
Lightwave Technology, Journal of
