Title :
Distributed feedback laser arrays fabricated by synchrotron orbital radiation lithography
Author :
Nakao, Masashi ; Sato, Kenji ; Nishida, Tsutomu ; Tamamura, Toshiaki
Author_Institution :
NTT Opto-Electron. Lab., Atsugi, Japan
fDate :
8/1/1990 12:00:00 AM
Abstract :
Twenty-wavelength integrated distributed feedback (DFB) laser arrays fabricated using synchrotron orbital radiation (SOR) lithography are demonstrated. All 20 DFB lasers on chip operated in a single-longitudinal mode, and their wavelengths are varied in accordance with grating periodicity. Typical optical output characteristics (light output versus current curve and lasing spectrum) are shown. Threshold is as low as 13 mA, and the output power is more than 20 mW. The maximum differential quantum efficiency reached 0.2 W/A. The side-mode suppression ratio is more than 35 dB. The characteristic temperature was found to be 50 K, and the temperature dependence of the lasing wavelength is 0.9 Å/°C
Keywords :
distributed feedback lasers; lithography; optical workshop techniques; semiconductor junction lasers; synchrotron radiation; 13 mA; 20 mW; 50 K; characteristic temperature; current curve; differential quantum efficiency; distributed feedback laser arrays; grating periodicity; lasing spectrum; light output; optical output characteristics; semiconductor lasers; side-mode suppression ratio; single-longitudinal mode; synchrotron orbital radiation lithography; wavelengths; Distributed feedback devices; Gratings; Laser feedback; Laser modes; Lithography; Optical arrays; Optical feedback; Power generation; Synchrotron radiation; Temperature dependence;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
