Title :
Continuously chirped DFB gratings by specially bent waveguides for tunable lasers
Author :
Hillmer, Hartmut ; Grabmaier, Anton ; Zhu, H.L. ; Hansmann, Stefan ; Burkhard, Herbert
Author_Institution :
Deutsche Telekom, Darmstadt, Germany
fDate :
9/1/1995 12:00:00 AM
Abstract :
We have implemented and studied a new type of tunable multiple-section semiconductor distributed feedback (DFB) laser using tailored chirped DFB gratings. Arbitrarily and continuously chirped DFB gratings are defined by bent waveguides on homogeneous grating fields with ultrahigh spatial precision. The mathematical bending functions are optimized in this case to provide enlarged wavelength tuning ranges. We present the results of model calculations, the technological device realization and experimental results of the DFB laser characterization e.g. a tuning range of 5.5 nm without wavelength gaps and high side mode suppression ratio
Keywords :
bending; diffraction gratings; distributed feedback lasers; laser feedback; laser modes; laser tuning; semiconductor lasers; waveguide lasers; DFB laser; DFB laser characterization; bent waveguides; continuously chirped DFB gratings; enlarged wavelength tuning ranges; high side mode suppression ratio; homogeneous grating fields; mathematical bending function optimisation; model calculations; specially bent waveguides; tailored chirped DFB gratings; technological device realization; tunable lasers; tunable multiple-section semiconductor distributed feedback laser; tuning range; ultrahigh spatial precision; wavelength gaps; Chirp; Distributed feedback devices; Gratings; Laser feedback; Laser modes; Laser tuning; Semiconductor lasers; Semiconductor waveguides; Tunable circuits and devices; Waveguide lasers;
Journal_Title :
Lightwave Technology, Journal of
