BW10âs tunable VCSEL technology is the fruit of several years of development by the co-founders at the University of California, Berkeley. Working with Prof. Chang-Hasnain, Dr. Chase, Dr. Rao and Dr. Huang completed their Ph.D. thesis research on VCSELs with a completely new concept for a top mirror, a High-Contrast Grating (HCG). The HCG is a single layer, ultra-thin grating made of a high index material with a sub-wavelength period, which exhibits a much broader reflection band than conventional Distributed Bragg Reflectors (DBR). Using the HCG as a tunable mirror, leads to a wafer-scale, low cost fabrication process for BW10âs long-wavelength 1550-nm, singlemode VCSEL transceiv
