Abstract
Continuously high-speed spectroscopic gas detection with a wide spectral span has a long time been a challenge. We propose a method based on an extended optical linear chirp chain (EOLCC) for gas spectrum measurement with a fast acquisition rate and a broad bandwidth. The basic optical linear chirp (OLC) unit moves a fixed frequency when it passes through an optical loop containing a dual-parallel Mach-Zehnder modulator driven by a microwave signal. This method is demonstrated by monitoring a high-speed flow process of acetylene gas under normal pressure, achieving a spectral bandwidth of 88 GHz, a repetition frequency of 0.53 MHz, a 100% duty cycle, and a frequency-chirping linearity error of 5.2 × 10−5. Our proposed method based on the EOLCC is expected to have a repetition frequency on the MHz order, showing great potential in the development of high speed optical gas sensors.
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription