Title :
Monolithic semiconductor soliton transmitter
Author :
Hansen, P.B. ; Raybon, G. ; Koren, U. ; Miller, B.I. ; Young, M.G. ; Newkirk, M.A. ; Chien, M.D. ; Tell, B. ; Burrus, C.A.
Author_Institution :
AT&T Bell Labs., Holmdel, NJ, USA
fDate :
2/1/1995 12:00:00 AM
Abstract :
A monolithic soliton transmitter is fabricated using the PPro-II process in the InGaAsP material system by integrating an electro-absorption modulator with an extended-cavity laser. The laser cavity comprises a 700-μm-long active region, which consists of 6 strain-compensated multiple quantum wells, a 8100-μm-long passive buried-rib waveguide section, and a Bragg reflector with a length of 250 μm. Mode-locking of the laser section results in 8-ps pulses at a repetition rate of 4.9 GHz. The time-bandwidth product is 0.30. Using the partially reflecting grating as one of the laser mirrors allows for integration of an electro-absorption modulator as a monolithic but extra-cavity data encoder. The modulator is fabricated by growing a 2000 A thick 1.46-μm quaternary layer on top of the waveguiding layers. At a 4.9-Gb/s data rate, an extinction ratio of 20 dB is measured at a signal wavelength of 1565.4 nm
Keywords :
electro-optical modulation; electroabsorption; integrated optoelectronics; laser cavity resonators; laser mirrors; laser mode locking; optical fabrication; optical fibre communication; optical solitons; optical transmitters; quantum well lasers; 1.46 mum; 1565.4 nm; 2000 A; 250 mum; 4.9 Gbit/s; 700 mum; 8 ps; 8100 mum; Bragg reflector; InGaAsP; InGaAsP material system; PPro-II process; active region; buried-rib waveguide section; electro-absorption modulator; extended-cavity laser; extinction ratio; extra-cavity data encoder; laser cavity; laser mirrors; laser section; mode-locking; monolithic semiconductor soliton transmitter; partially reflecting grating; quaternary layer; repetition rate; signal wavelength; strain-compensated multiple quantum wells; time-bandwidth product; waveguiding layers; Laser mode locking; Optical materials; Optical pulses; Quantum well lasers; Semiconductor lasers; Semiconductor materials; Semiconductor waveguides; Solitons; Transmitters; Waveguide lasers;
Journal_Title :
Lightwave Technology, Journal of
