980 nm pump lasers are the engines of Erbium Doped Fiber Amplifier (EDFA). The challenges for 980nm, high power, constant wave (CW) laser are high optical power and long device lifetime (200,000 hours at 250-300 mW). Today, all commercial high power 980nm pump lasers are made from AlxGa1-xAs on GaAs substrates by MOCVD or MBE.
This talk will introduce semiconductor laser structure and applications. Failure mechanisms of the laser are classified into bulk defects induced and surface defects induced. The presentation will focus on surface state induced catastrophic optical facet damage (COFD). The surface states were generated after wafer cleaving and by instant facet oxidation. The commercial way to prevent COFD is the E2 passivation process invented by IBM, in which process, laser bars are cleaved in vacuum at 10-9 -10-10 Torr, and the facets are instantly coated with a thin Si film. However, slow throughput is the bottleneck for E2 process. At Corning, we have invented an ion beam facet cleaning and passivation technique. The process is suitable for mass production of 980 nm pump lasers. Using the process, laser life is garneted to over 100,000 hours. Other approaches to preventing COD will be discussed at the end of the talk.
980nm pump module
Motivation for facet passivation
Ion beam work
About the speaker
Mike Xu Ouyang, Ph.D. McMaster U. 1995, M.Engin. University of Electronic Sci. & Engin. of China UESTC, Chengdu, Chian), 1987, BA. UESTC, 1982.
Mike is working as a chief engineer at NanoOpto Co, NJ on Nano-optical devices for polarization beam splitter/combiner. Before joining NanoOpto, Mike worked 5 years as a senior research scientist at Corning Inc, Corning, NY on fundamental research of thin films for applications in photonics, flat panel displays, and environmental products. Mike's other jobs were CTO at Lite Array for a technology transfer of thin film electroluminescent display (TFEL) production to China, and a senior research scientist at Luxell Technology, Toronto, where Mike developed a first commercial sunlight legible TFEL display. Mike's research interests are thin films, surface & interface, flat panel displays and photonic components for optical telecommunication. Mike has 6 patents and 13 papers published.