Title :
Far-field patterns of Quantum Well, Quantum Dash, and Quantum Dot Laser Diodes
Author :
Ding, Y.H. ; Tan, C.L. ; Hongpinyo, V. ; Dimas, C.E. ; Wang, Y. ; Chen, C. ; Djie, H.S. ; Ooi, B.S.
Author_Institution :
Comput. Eng. Dept., Lehigh Univ., Bethlehem, PA
Abstract :
We perform measurements of far field pattern of various quantum-confined heterostructures namely quantum well (QW), quantum dash (Qdash), and quantum dot (Qdot) lasers to study the effect of different active gain mediums of semiconductor lasers on the optical beam quality and coupling efficiency. The beam pattern profile of the Qdash laser is similar to that of the QW laser (FWHM ~ 20deg) while Qdot laser shows smaller divergence (FWHM ~ 5deg) and retain its intensity profile of single lobe Gaussian-shape at current injection up to two and half times threshold current.
Keywords :
Gaussian distribution; optical couplers; quantum dot lasers; quantum well lasers; coupling efficiency; current injection; far-field patterns; optical beam quality; quantum dash laser diodes; quantum dot laser diodes; quantum well laser diodes; semiconductor lasers; single lobe Gaussian-shape; threshold current; Diode lasers; Gain measurement; Optical beams; Optical coupling; Performance evaluation; Performance gain; Quantum dot lasers; Quantum dots; Quantum well lasers; Semiconductor lasers;
Conference_Titel :
PhotonicsGlobal@Singapore, 2008. IPGC 2008. IEEE
Conference_Location :
Singapore
Print_ISBN :
978-1-4244-3901-0
Electronic_ISBN :
978-1-4244-2906-6
DOI :
10.1109/IPGC.2008.4781309
