Title :
Electrical subharmonic hybrid mode locking of a colliding pulse mode-locked laser at 28 GHz
Author :
Ji, C. ; Chubun, N. ; Broeke, R.G. ; Cao, J. ; Du, Y. ; Bjeletich, P. ; Yoo, S.J.B.
Author_Institution :
Electr. & Comput. Eng. Dept., Univ. of California, Davis, CA, USA
fDate :
7/1/2005 12:00:00 AM
Abstract :
This letter discusses electrical subharmonic hybrid mode locking (SHML) of a colliding pulse mode-locked (CPM) laser in InP. The CPM laser fabrication adopts a simple wet etching process and bisbenzocyclobutene planarization process for realizing planarized low-capacitance devices. The experimental results show, for the first time to our knowledge, stable emission of nearly transform-limited pulses at 28 GHz of a CPM laser synchronized to a clock source by SHML. We further describe careful optimization steps of dc and radio-frequency biasing conditions which lead to minimal output pulsewidth of 1.4 ps, limited by the saturable absorber dimension.
Keywords :
III-V semiconductors; etching; indium compounds; laser mode locking; optical pulse generation; optical saturable absorption; optimisation; organic compounds; planarisation; quantum well lasers; semiconductor epitaxial layers; synchronisation; 28 GHz; InP; bisbenzocyclobutene planarization; clock source; colliding pulse laser; dc biasing; electrical mode locking; hybrid mode locking; laser fabrication; laser synchronization; low-capacitance devices; mode-locked laser; optimization steps; radiofrequency biasing; saturable absorber; subharmonic mode locking; transform-limited pulses; wet etching; Clocks; Indium phosphide; Laser mode locking; Laser stability; Optical device fabrication; Optical pulses; Planarization; Radio frequency; Synchronization; Wet etching; Clock synchronization; colliding pulse mode-locked (CPM) laser; radio-frequency (RF) modulation; subharmonic hybrid mode locking (SHML); transform-limited pulse;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.848555
