Carrier-Transport-Limited Modulation Bandwidth in Distributed Reflector Lasers with Wirelike Active Regions
Carrier-Transport-Limited Modulation Bandwidth in Distributed Reflector Lasers with Wirelike Active Regions
复制标题
具有线状有源区域的分布式反射激光器中的载流子传输限制调制带宽
DOI：
10.1109/jqe.2012.2190822
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
S. Arai
中科院分区：
文献类型：
--
作者：
D. Takahashi;S. Lee;M. Shirao;T. Shindo;K. Shinno;T. Amemiya;N. Nishiyama;S. Arai
从GaInAsP光限制层（OCL）到有源区的载流子输运角度研究了具有线状有源区的1.55 μ mGaInAsP/InP分布反射（DR）激光器的高速直接调制能力。理论分析表明，调制带宽对OCL的厚度和线状有源区的宽度有很强的依赖性。为了证实这一预测，两个DR激光器与OCL的不同厚度（120和40 nm）的制造和小信号调制下的3 dB带宽（f3 dB）进行了比较。在25 Gb/s调制下，窄OCL器件的f3 dB超过15 GHz，且具有清晰的眼图张开度，而厚OCL器件的f3 dB仅为2 GHz。这些结果与理论预测吻合得很好。
High-speed direct modulation capability was investigated in 1.55-μm GaInAsP/InP distributed reflector (DR) lasers with wirelike active regions in terms of carrier transport from GaInAsP optical confinement layers (OCLs) to the active regions. Theoretical analysis revealed strong dependence of the modulation bandwidth on the thickness of the OCLs and width of the wirelike active regions. To confirm this prediction, two DR lasers with OCLs of different thicknesses (120 and 40 nm) were fabricated and their 3-dB bandwidths (f3 dB) under small-signal modulation were compared. The device with the narrower OCL exhibited f3 dBexceeding 15 GHz and clear eye opening under 25 Gb/s modulation, whereas that with the thicker OCL had f3 dBof only 2 GHz. These results were in good agreement with the theoretical predictions.