Title :
Wide-bandwidth modulation of three-channel buried-crescent laser diodes
Author :
Koren, U. ; Eisenstein, Gadi ; Bowers, John E. ; Gnauck, A.H. ; Tien
Author_Institution :
AT&T Bell Laboratories, Holmdel, USA
Abstract :
The modulation bandwidth of three-channel buried-crescent (TCBC) lasers was improved by reducing the ohmic contact resistance by adding a quaternary contact layer for the P-contact of the device. The ohmic resistance was reduced to 6¿9 ¿, with a capacitance of 1.5¿3 pF and an inductance of 1.5¿2 nH. The small-signal 3 dB modulation frequency is 7.2 GHz at 2.5Ith, and is limited by the parasitic impedances of the device. Large-signal digital modulation of the laser was successfully achieved at 8 Gbit/s, which is the highest frequency for direct digital modulation yet reported.
Keywords :
optical modulation; semiconductor junction lasers; P-contact; TCBC lasers; bandwidth 7.2 Ghz; bit rate 8 Gbit/s; direct digital modulation; modulation bandwidth; ohmic contact resistance; parasitic impedances; quaternary contact layer; semiconductor lasers; small-signal 3 dB modulation frequency; three-channel buried-crescent laser diodes;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19850354
