Title :
40-Gb/s Direct Modulation With High Extinction Ratio Operation of 1.3-μm InGaAlAs Multiquantum Well Ridge Waveguide Distributed Feedback Lasers
Author :
Nakahara, K. ; Tsuchiya, T. ; Kitatani, T. ; Shinoda, K. ; Taniguchi, T. ; Kikawa, T. ; Aoki, M. ; Mukaikubo, M.
Author_Institution :
Hitachi Ltd., Tokyo
Abstract :
Direct modulation at 40 Gb/s of a 1.3-mum InGaAlAs distributed feedback ridge waveguide laser is experimentally demonstrated. By combination of the high differential gain of an InGaAlAs multiquantum well active layer, a short cavity length of 100 mum, and a low-resistance notch-free grating, it achieves high bandwidth of 29 GHz and high-extinction ratio of 5 dB at 40-Gb/s modulation. Moreover, the laser operates at a record maximum ambient temperature of 60degC under 40-Gb/s directly modulation. It also achieves 40-Gb/s modulated transmission over 2 km with a low power penalty of 0.25 dB at 25degC .
Keywords :
III-V semiconductors; aluminium compounds; diffraction gratings; distributed feedback lasers; extinction coefficients; gallium arsenide; indium compounds; laser cavity resonators; optical fibre communication; optical modulation; optical transmitters; optical waveguide components; quantum well lasers; thermo-optical effects; waveguide lasers; InGaAlAs; ambient temperature; bandwidth 29 GHz; bit rate 40 Gbit/s; cavity length; differential gain; direct modulation; distance 2 km; extinction ratio operation; laser operation; low power penalty; low-resistance notch-free grating; multiquantum well ridge waveguide distributed feedback lasers; size 100 mum; temperature 25 C; temperature 65 C; wavelength 1.3 mum; Distributed feedback devices; Extinction ratio; Fiber lasers; Gratings; Laser feedback; Optical waveguides; Power lasers; Quantum well devices; Temperature; Waveguide lasers; Distributed feedback (DFB) lasers; optical fiber communication; optical transmitters; ridge waveguide (RWG); semiconductor lasers;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.903530
