Ultra-high Frequency Linear Fiber Optic Systems by Kam Lau

Author:Kam Lau
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

The above results demonstrate the efficient modulation of a single contact monolithic semiconductor laser at the “round-trip frequency” of 40 GHz. Both temporal and RF measurements show clear evidence of millimeter-wave modulated light output from the laser. The observed feed point dependence of the modulation efficiency provides definitive evidence that mode-locking exists in the single contact device due to the limited propagation distance of the millimeter-wave signal. This technique was studied using a simple distributed circuit model of the laser in conjunction with conventional mode-locking theory. The optimum feed-point and mode-coupling factor over the millimeter-wave frequency range are found to be ∼ L ∕ 8 and (γL) − 1, respectively. These results are a very important step toward the realization of practical millimeter-wave optical transmitters based on direct modulation of monolithic semiconductor lasers.

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