Title :
Reduction of nonlinear distortion in semiconductor lasers with external light injection
Author :
Pua, M.H. ; Haldar, M.K. ; Mendis, F.V.C. ; Garg, H.K.
Author_Institution :
Dept. of Electr. Eng., Nat. Univ. of Singapore, Singapore
Abstract :
It is demonstrated analytically that the static light-current characteristic of an injection-locked laser is highly linear away from the threshold and is suitable for direct intensity modulation. By using a small signal perturbative approach, expressions for the second order harmonic distortion and two-carrier third order intermodulation distortion are evaluated. At microwave frequencies, it is demonstrated that these distortions can be significantly reduced using injection locking. This is attributed to additional coupling effects between optical phase and photons under injection locking, in addition to the photon-electron interactions seen in free-running lasers
Keywords :
harmonic distortion; intermodulation distortion; laser mode locking; optical communication equipment; optical modulation; semiconductor lasers; subcarrier multiplexing; coupling effects; direct intensity modulation; external light injection; free-running lasers; injection locking; injection-locked laser; microwave frequencies; nonlinear distortion reduction; optical phase; photon-electron interactions; photons; second order harmonic distortion; semiconductor lasers; small signal perturbative approach; static light-current characteristic; subcarrier multiplexing; two-carrier third order intermodulation distortion; Harmonic distortion; Injection-locked oscillators; Intensity modulation; Intermodulation distortion; Laser noise; Masers; Microwave frequencies; Nonlinear distortion; Optical distortion; Semiconductor lasers;
Conference_Titel :
Information, Communications and Signal Processing, 1997. ICICS., Proceedings of 1997 International Conference on
Print_ISBN :
0-7803-3676-3
DOI :
10.1109/ICICS.1997.652163
