Kim Taeyong, Kim Sang-Bae
Department of Electrical and Computer Engineering, Ajou University, Gyeonggi, South Korea.
Opt Express. 2010 Jan 18;18(2):1271-7. doi: 10.1364/OE.18.001271.
We have demonstrated that, in elevated oxide-layer vertical-cavity surface-emitting lasers (VCSELs) where the spacing between 1-lambda cavity and oxide layer is 9lambda/4, a variety of turn-off-induced abnormalities such as secondary pulsations, bumps and tails is effectively suppressed. Compared are turn-off transient responses of conventional and elevated oxide-layer VCSELs with the oxide-aperture diameter of approximately 6.6 microm. The "on"- and "off"-current dependence of the turn-off-induced transient responses and bit rate dependence of the timing jitters show that the elevated oxide-layer structure effectively suppresses the turn-off-induced pulsations to less than half of the conventional one, which enables the VCSEL transmitter to operate without deleterious effects by the turnoff-induced pulsation.
我们已经证明，在1-λ腔与氧化层间距为9λ/4的高氧化层垂直腔面发射激光器（VCSEL）中，各种关断诱导异常，如二次脉动、尖峰和拖尾，都能得到有效抑制。比较了氧化孔径约为6.6微米的传统VCSEL和高氧化层VCSEL的关断瞬态响应。关断诱导瞬态响应的“开”和“关”电流依赖性以及定时抖动的比特率依赖性表明，高氧化层结构有效地将关断诱导脉动抑制到传统结构的一半以下，这使得VCSEL发射器能够在关断诱导脉动的情况下无有害影响地运行。
