Accession Number:

ADA612528

Title:

Modulation Response of a Long-Cavity, Gain-Levered Quantum-Dot Semiconductor Laser - Postprint

Descriptive Note:

Interim rept. 1 Aug 2012-1 Aug 2013

Corporate Author:

AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH SENSORS DIR AEROSPACE COMPONENTS AND SUBSYSTEMS TECHNOLOGY DIV/ELECTRO-OPTICS COMPONENTS BR

Report Date:

2014-01-27

Pagination or Media Count:

11.0

Abstract:

The gain-lever effect enhances the modulation efficiency of a semiconductor laser when compared to modulating the entire laser. This technique is investigated in a long-cavity multi-section quantum-dot laser where the length of the modulation section is varied to achieve 142, 151 and 016 gain-to-modulation section ratios. In this work, the gain-levered modulation configuration resulted in an increase in modulation efficiency by as much as 16 dB. This investigation also found that the 3-dB modulation bandwidth and modulation efficiency are dependent on the modulation section length of the device, indicating the existence of an optimal gain-to-modulation section ratio. The long cavity length of the multi-section laser yielded a distinctive case where characteristics of both the gain-lever effect and spatial effects are observed in the modulation response. Here, spatial effects within the cavity dominated the small-signal modulation response close to and above the cavitys free-spectral range frequency, whereas the gain-lever effect influenced the modulation response throughout the entirety of the response.

Subject Categories:

  • Lasers and Masers
  • Electricity and Magnetism
  • Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE