We present the design, fabrication, and performance of high-speed oxide-confined 1030 nm vertical-cavity surfaceemitting lasers (VCSELs) with a short optical cavity, and multiple oxide apertures. High-speed modulation was facilitated by using the shortest possible cavity of a half-wavelength length and multiple oxide apertures to enhance the confinement of optical fields and reduce capacitance. We carefully optimized the multiple quantum wells and the doping profile in order to achieve a high-speed operation. The developed VCSELs exhibit a modulation bandwidth exceeding 25.1 GHz at 25°C, supporting back-to-back data rate up to 40 Gb/s under binary non-return-to-zero (NRZ) modulation.
It was proposed and demonstrated that a high beam quality self-pulse could be achieved by off-axis feedback for 1.95-μm GaSb-based broad-area laser. The comparative studies of on-axis feedback and off-axis feedback were conducted in an experiment. A highly reflecting (HR) mirror with sharp edge was used in the off-axis feedback system and the overlapping size was changed by moving the HR mirror. At the direct current of 1.8 A, 45-cm external cavity length, and 36% strength of feedback, the off-axis feedback with the overlapping size of 1.2 mm could accomplish the regular periodic pulse with the frequency of 153 MHz. The beam quality M2 was 12.75 in slow axis and improved nearly doubled compared with that in the on-axis feedback system.
KEYWORDS: Semiconductor lasers, Waveguides, Quantum wells, Near field optics, Continuous wave operation, Refractive index, High power lasers, Photonic crystals, Resistance, Scanning electron microscopy
We report near circular beam output from 808 nm edge-emitting diode lasers based on Bragg reflection waveguide design. Increasing quantum well number combined with reducing defect layer index and thickness was used to achieve high power output and extremely low vertical far field divergence. The TQW-BRLs achieve the lowest vertical divergence of 4.91° (full width at half maximum) and 9.8° (95% power). The maximum power of 4.6 W was achieved in the mounted DQW-BRL device under continuous-wave operation, being limited by thermal rollover.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.