We present multi-frequency low-noise semiconductor laser sources for resonant fiber optic gyroscope (RFOG) interrogation that have enabled excellent gyro stability over temperature. Each laser source includes three distributed feedback semiconductor laser chips coupled with micro-lenses to multi-component silicon photonics (SiP) chips. A first laser, the master, is locked to the RFOG with a Pound-Drever-Hall loop. Two slave lasers are optically phase-locked to the master laser with electrical loop bandwidths of 100 MHz. The SiP chips perform beat note detection and several other functions, such as phase and intensity noise suppression. The lasers and SiP chips are packaged in an optical engine that is controlled by compact low noise electronics. The fiber pigtails are connected to the RFOG so that light is sent in clockwise and counterclockwise directions. Tracking of the RFOG resonance frequencies in both directions allows rotation sensing. An ultra-stable differential frequency noise floor of 0.05 Hz/rt-Hz was obtained between the lasers and the coil resonator which was instrumental in achieving results for the RFOG over 60˚ C operating temperature range. The corresponding angle random walk level is less than 0.01 ˚/rt-hr and was not limited by laser differential frequency noise. The gyroscope bias drift over the tested temperature range was maintained within 0.005 ˚/hr, the best-ever published RFOG performance over temperature to date.
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.