Alexandria Digital Research Library

Field-Induced Charge-Separation Lasers for Direct Gain Modulation

Author:
Lin, Chin-Han
Degree Grantor:
University of California, Santa Barbara. Electrical & Computer Engineering
Degree Supervisor:
Larry A. Coldren
Place of Publication:
[Santa Barbara, Calif.]
Publisher:
University of California, Santa Barbara
Creation Date:
2012
Issued Date:
2012
Topics:
Nanotechnology, Physics, Quantum, and Engineering, Electronics and Electrical
Keywords:
Vertical-cavity surface-emitting laser
Laser
Bandgap engineering
High-speed modulation
Device fabrication
Quantum physics
Genres:
Dissertations, Academic and Online resources
Dissertation:
Ph.D.--University of California, Santa Barbara, 2012
Description:

Optical interconnects are of great interests as their electrical counterparts reach the physical limits. The two main research motivations are: (1) on-chip optical interconnects to sustain the growth of microprocessors and (2) the optical datalinks that bridge the communication between server racks within mega data centers and high-performance computers.

As ultra-high speed photodetectors are readily available for commercial use, optical interconnects often see the performance bottleneck at the laser end. In terms of energy per bit, direct modulation is always the most efficient method to operate a laser. However, the interaction between carriers and photons inside the laser active region gives rise to the relaxation resonance, which sets the limit for modulation speed. Increasing the bias current is the easiest way to increase the relaxation resonance frequency, until damping effect takes over. Moreover, high current density unfortunately leads to material degradation and shortens the device lifetime.

To achieve a better performance scaling, we investigated the concept of direct gain modulation, which from our study showed the addition of a zero frequency to the conventional two-pole transfer function of directly modulated lasers, and promised a higher modulation bandwidth. To realize direct gain modulation, we proposed a novel field-induced charge-separation laser (FICSL) structure in a three-terminal vertical-cavity surface-emitting laser (VCSELs) embodiment. In this presentation, the theory, device design, modeling, growth, fabrication, and experimental results of FICSLs will be discussed.

Physical Description:
1 online resource (263 pages)
Format:
Text
Collection(s):
UCSB electronic theses and dissertations
ARK:
ark:/48907/f3h41pdv
ISBN:
9781267934116
Catalog System Number:
990039503310203776
Rights:
Inc.icon only.dark In Copyright
Copyright Holder:
Chin-Han Lin
Access: This item is restricted to on-campus access only. Please check our FAQs or contact UCSB Library staff if you need additional assistance.