Broadly Tunable Laser Using Double-Rings Vertically Coupled to a Passive Waveguide

A widely tunable laser source based on double microrings is presented which exhibits tuning range up to 46 nm. Two microrings consisting of active GaInAsP/InP material are vertically coupled with a straight transparent waveguide using full wafer bonding techniques. Wafer bonding allows the fabricati...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2010-03, Vol.46 (3), p.306-312
Main Authors: Kapsalis, A., Syvridis, D., Hamacher, M., Heidrich, H.
Format: Article
Language:English
Subjects:
Active control
Active passive integration
Bonding
coupled cavities
Couplers
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Holes
Indium phosphide
injection current controlled tuning
Laser modes
Laser tuning
microring lasers
Optical coupling
Optical device fabrication
Optical elements, devices, and systems
Optical materials
Optical waveguides and coupleurs
Optics
Physics
Tunable circuits and devices
Tunable lasers
tunable sources
Tuning
Vernier effect
vertical coupling
Wafer bonding
Wafers
Waveguide lasers
Waveguides
Wavelengths
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Summary:A widely tunable laser source based on double microrings is presented which exhibits tuning range up to 46 nm. Two microrings consisting of active GaInAsP/InP material are vertically coupled with a straight transparent waveguide using full wafer bonding techniques. Wafer bonding allows the fabrication of ultra short couplers where the critical coupling gap can be epitaxially controlled. The microrings are operated above threshold and act as laser sources forming a coupled cavity system. Their respective radii are chosen to be slightly different, greatly extending the coupled cavity free spectral range (FSR) providing sufficiently high mode suppression ratio ( MSR > 30 dB). The isolation of adjacent rings allows an individual electrical control and enables a wavelength tuning with pm accuracy. The tuning mechanism benefits from the Vernier effect resulting in a broad range of achievable wavelengths in a systematic and repeatable way.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2009.2033714