Frequency tracking for heterodyne optical communications using semiconductor lasers
- 1 January 1983
- proceedings article
- Published by Optica Publishing Group
Abstract
Recently there has been considerable interest in heterodyne optical communications for intersatellite links, in particular, using semiconductor lasers, because of the potential for substantial performance Improvement over direct detection systems.1 However, phase or frequency modulated systems will require a stable Intermediate frequency (IF) signal for demodulation with low bit error rates. Stabilizing the frequency of GaAlAs lasers by locking to an external reference has been demonstrated previously.2 However, such schemes by themselves will not suffice in space communications applications because links between platforms moving relative to each other can experience Doppler shifts of 10 GHz or more at 1 μm.3 Therefore, frequency locking the receiver’s local oscillator (LO) to the Incoming signal is required.Keywords
This publication has 2 references indexed in Scilit:
- Optical FSK heterodyne detection experiments using semiconductor laser transmitter and local oscillatorIEEE Journal of Quantum Electronics, 1981
- High frequency stability of laser diode for heterodyne communication systemsElectronics Letters, 1980