Compact electro-absorption modulator integrated with vertical-cavity surface-emitting laser for highly efficient millimeter-wave modulation
Compact electro-absorption modulator integrated with vertical-cavity surface-emitting laser for highly efficient millimeter-wave modulation
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DOI：
10.1063/1.4894716
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发表时间：
2014-08
影响因子：
4
通讯作者：
H. Dalir;Moustafa Ahmed;A. Bakry;F. Koyama
中科院分区：
文献类型：
--
作者：
H. Dalir;Moustafa Ahmed;A. Bakry;F. Koyama
我们展示了一种紧凑的电吸收慢光调制器，横向集成了850 nm垂直腔面发射激光器（VCSEL），实现了高效的毫米波调制。通过将波导宽度加宽成锥形，发现两腔间横向存在较强的漏行波。在35 GHz以上的频率下，器件的信号响应较小，调制幅度提高了55 dB以上；多亏了光子-光子共振。在25 μm长的紧凑型调制器中，Bragg反射波导中超过150的大群指数可以实现毫米波频率下的共振。基于模型，我们期望在70 GHz的更高频率上进行谐振调制。小型慢光调制器中的谐振调制对于在远超VCSELs固有调制带宽的毫米波范围内实现高效窄带调制具有重要的关键作用。
We demonstrate a compact electro-absorption slow-light modulator laterally-integrated with an 850 nm vertical-cavity surface-emitting laser (VCSEL), which enables highly efficient millimeter-wave modulation. We found a strong leaky travelling wave in the lateral direction between the two cavities via widening the waveguide width with a taper shape. The small signal response of the fabricated device shows a large enhancement of over 55 dB in the modulation amplitude at frequencies beyond 35 GHz; thanks to the photon-photon resonance. A large group index of over 150 in a Bragg reflector waveguide enables the resonance at millimeter wave frequencies for 25 μm long compact modulator. Based on the modeling, we expect a resonant modulation at a higher frequency of 70 GHz. The resonant modulation in a compact slow-light modulator plays a significant key role for high efficient narrow-band modulation in the millimeter wave range far beyond the intrinsic modulation bandwidth of VCSELs.