Optically decoupled dual-cavity VCSEL-modulator high-speed light source

智能优点高调制频率垂直腔面发射激光器(VCSEL)和密集VCSEL阵列有望改变从硅IC I/O(可能还有长芯片内)到模块和板级的整个短程互连范例。电流调制激光二极管的带宽由于固有的动态过程而被限制在20 GHz左右，但通过外部调制可以显着增加带宽。在这种情况下，应该抑制从调制器到激光器的光反馈，例如，在电信应用中使用光隔离器。在本项目中，我们将研究一种新型的VCSEL单片调制器发射器增益部分和吸收部分的光学解耦方法。这种方法的实质是利用带有量子受限斯塔克效应的失谐法布里-珀罗腔来抑制从调制器反射的光波的交流部分。该工作计划包括对“去耦合”双腔器件过程的物理研究，开发数字模型以评估器件参数之间的关系，如谐振失谐精度、调制深度和外加电压摆动；失谐、调制带宽和频率啁啾，以及优化和演示优越的器件特性。预计所提出的VCSEL调制器发射器将表现出受低功率反向偏置调制器p-i-n二极管寄生的限制的40-100 GHz的带宽，以及可以从负到正控制的减小频率啁啾。更广泛的影响：预计拟议的研究将对教育计划产生更广泛的影响，这些研究将受益于微腔、VCSELs和调制器的物理研究以及开发的工具和技术，这些工具和技术包括在PI的两门研究生课程中，直接参与这项研究的研究生、本科生和历史上在研究生教育中代表性不足的学生，以及进一步开发交互式“网络工具”(http://www.albany.edu/~soktyabr/webtools))，用于光电设备的设计和虚拟制造。

Intellectual MeritsHigh modulation frequency vertical cavity surface-emitting lasers (VCSELs) and dense VCSEL arrays are expected to change the whole paradigm of short-range interconnections ranging from silicon IC I/O's (and perhaps long intra-chip) to module- and board-level. The bandwidth of current-modulated laser diodes is limited to about 20 GHz by intrinsic dynamic processes but can be significantly increased by external modulation. In this case, optical feedback from the modulator to laser should be suppressed, for example, using optical isolator as in telecom applications. In this project, a novel method of optical decoupling of gain and absorber sections of a monolithic VCSEL-modulator emitter will be studied. The essence of the approach is in the suppression of the AC part of the optical wave reflected from the modulator section using a detuned Fabri-Perot cavity with quantum-confined Stark effect absorber. The work plan contains studies of the physics of the processes in the "decoupled" dual-cavity device, development of numerical models to assess relationships between the device parameters, such as resonance detuning accuracy, modulation depth and applied voltage swing; detuning, modulation bandwidth and frequency chirp, and optimization and demonstration of superior device characteristics. It is expected that the proposed VCSEL-Modulator emitter will demonstrate bandwidth of 40-100 GHz limited by parasitics of a low-power reverse-biased modulator p-i-n diode, and reduced frequency chirping which can be controlled from negative to positive. Broader Impacts:Broader impact of the proposed research is expected in education program that will benefit from the studies on physics of microcavities, VCSELs and modulators and the developed tools and technologies included into two PI's graduate level courses, direct participation in this research of graduate, undergraduate and historically under-represented in graduate education students and further development of interactive "Web-Tools" (http://www.albany.edu/~soktyabr/webtools) for design and virtual fabrication of optoelectronic devices.