14 January 1987 A Compact Single-Frequency Laser Package With 1 MHz linewidth and ±10 MHz Frequency Stability
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Proceedings Volume 0723, Progress in Semiconductor Laser Diodes; (1987) https://doi.org/10.1117/12.937684
Event: Cambridge Symposium-Fiber/LASE '86, 1986, Cambridge, MA, United States
A compact single-frequency laser package is reported. In this device, a distributed feedback laser is coupled to a graded-index rod external cavity. hen light fed back into the laser cavity is at the proper phase, linewidth narrowing is obtained. The package consists of a laser source, the graded-index rod optics, a piezo-electric crystal, a milli-Kelvin temperature control element, and a microwave bias board, all in a 1 in thermally insulated enclosure. Miniaturization is made possible by a novel collinear optical assembly. A linewidth of 1.3 and a short-term frequency stability of +10 nliz have been measured. Direct frequency modulation with the injection current is possible with this short external coupled cavity arrangement. At 565 kb/s, a frequency modulation index of 1 was achieved for a 1010 pattern with negligible linewidth broadening. Error-free transmission was measured in a frequency-shift-keying heterodyne detection experiment for fixed word patterns at this data rate. The compact size and the FM properties of the unit are attractive for use either as a transmitter or as a local oscillator in coherent optical communication systems.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
S. G. Menocal, T. P. Lee, H. P. Leblanc, R. S. Vodhanel, "A Compact Single-Frequency Laser Package With 1 MHz linewidth and ±10 MHz Frequency Stability", Proc. SPIE 0723, Progress in Semiconductor Laser Diodes, (14 January 1987); doi: 10.1117/12.937684; https://doi.org/10.1117/12.937684

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