Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 13, Issue 12, Pages 1295-1297Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/68.969886
Keywords
high bit rate transmissions; Mach-Zehnder modulator; modulated feedback; shallow-ridge technology
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The main problem of integrated laser/Mach-Zehnder modulators is the modulated feedback due to reflections on the output multimode image (MMI). We have solved this problem changing the modulator technology from deep-ridge to shallow-ridge technology. In that case, the index step seen by the light in the MMI is far lower, then reflections are nondetectable in optical low coherence reflectometry (OLCR) and there is no laser resonance left. This technology also enables a wider bandwidth (thanks to a stronger electrooptic effect) and a higher output power (better coupling between laser and modulator and lower loss of shallow-ridge guides).
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