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Single-mode laser studies: Design and performance of a fixed-wave length source and coupling of lasers to thin-film optical waveguidesA module developed for the generation of a stable single wavelength to be used for a fiber optic multiplexing scheme is described. The laser is driven with RZ pulses, and the temperature is stabilized thermoelectrically. The unit is capable of maintaining a fixed wavelength within about 6 A as the pulse duty cycle is changed between 0 and 100 percent. This is considered the most severe case, and much tighter tolerances are obtainable for constant input power coding schemes. Using a constricted double heterostructure laser, a wavelength shift of 0.083 A mA is obtained due to laser self-heating by a dc driving current. The thermoelectric unit is capable of maintaining a constant laser heat-sink temperature within 0.02 C. In addition, miniature lenses and couplers are described which allow efficient coupling of single wavelength modes of junction lasers to thin film optical waveguides. The design of the miniature cylinder lenses and the prism coupling techniques allow 2 mW of single wavelength mode junction laser light to b coupled into thin film waveguides using compact assemblies. Selective grating couplers are also studied.
Document ID
19800025227
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Ladany, I. (RCA Labs. Princeton, NJ, United States)
Hammer, J. M. (RCA Labs. Princeton, NJ, United States)
Date Acquired
September 4, 2013
Publication Date
October 1, 1980
Subject Category
Lasers And Masers
Report/Patent Number
FR-2
PRRL-80-CR-13
NASA-CR-3341
Report Number: FR-2
Report Number: PRRL-80-CR-13
Report Number: NASA-CR-3341
Accession Number
80N33735
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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