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Proceedings Paper

A Compact Single-Frequency Laser Package With 1 MHz linewidth and +10 MHz Frequency Stability
Author(s): S. G. Menocal; T. P. Lee; H. P. Leblanc; R. S. Vodhanel
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Paper Abstract

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.

Paper Details

Date Published: 14 January 1987
PDF: 8 pages
Proc. SPIE 0723, Progress in Semiconductor Laser Diodes, (14 January 1987); doi: 10.1117/12.937684
Show Author Affiliations
S. G. Menocal, Bell Communications Research (United States)
T. P. Lee, Bell Communications Research (United States)
H. P. Leblanc, Bell Communications Research (United States)
R. S. Vodhanel, Bell Communications Research (United States)

Published in SPIE Proceedings Vol. 0723:
Progress in Semiconductor Laser Diodes
Elliot G. Eichen, Editor(s)

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