Title :
Center frequency shift and reduction of feedback in directly modulated external cavity lasers
Author :
Schiellerup, G. ; Pedersen, R.J.S. ; Olesen, H. ; Tromborg, B.
Author_Institution :
Electromagn. Inst., Tech. Univ. of Denmark, Lyngby, Denmark
Abstract :
It is shown experimentally and theoretically that a center frequency shift occurs when an external cavity laser is directly modulated. The shift can be observed even when the frequency deviation is small compared to the roundtrip frequency of the external cavity and can qualitatively be explained by a reduction in the effective feedback level due to modulation. The frequency shift was measured as a function of modulation frequency and current, and frequency shifts up to 350 MHz were observed.<>
Keywords :
feedback; laser cavity resonators; optical modulation; semiconductor junction lasers; center frequency shift; current; directly modulated external cavity lasers; effective feedback level; frequency deviation; modulation frequency; roundtrip frequency; semiconductor laser; Current measurement; Frequency measurement; Frequency modulation; Laser feedback; Laser modes; Laser theory; Nonlinear optics; Optical feedback; Optical resonators; Resonance;
Journal_Title :
Photonics Technology Letters, IEEE
