Integrated-Optical Wavelength Sensor with Self-Compensation of Thermally Induced Phase Shifts by Use of a LiNbO3 Unbalanced Mach–Zehnder Interferometer
Applied Optics, Vol. 41, Issue 29, pp. 6211-6219 (2002)
http://dx.doi.org/10.1364/AO.41.006211
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Abstract
We demonstrate an integrated-optical unbalanced Mach-Zehnder interferometer in lithium niobate for detecting wavelength shifts of light sources, such as laser diodes and superluminescentdiodes at λ = 844 nm. The output signal can be used to stabilize the light source. Because of the temperature dependence of the effective refractive index and the thermal expansion of the substrate, the device acts also as a temperature sensor. The temperature sensitivity of the interferometer was compensated for by the combination of proton exchanged- and annealed proton exchanged-channel waveguides by approximately two orders of magnitude. The thermo-optic coefficients of the extraordinary effective refractive index in integrated optical channel waveguides in LiNbO3 have been measured with high accuracy over a temperature range from 10 °C to 40 °C.
© 2002 Optical Society of America
[Optical Society of America ]
OCIS Codes
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(130.2790) Integrated optics : Guided waves
(130.3120) Integrated optics : Integrated optics devices
(130.3730) Integrated optics : Lithium niobate
(130.6010) Integrated optics : Sensors
(160.6840) Materials : Thermo-optical materials
(230.7380) Optical devices : Waveguides, channeled
Citation
Ulrich Grusemann, Brit Zeitner, Matthias Rottschalk, Jens-Peter Ruske, Andreas Tünnermann, and Andreas Rasch, "Integrated-Optical Wavelength Sensor with Self-Compensation of Thermally Induced Phase Shifts by Use of a LiNbO3 Unbalanced Mach–Zehnder Interferometer," Appl. Opt. 41, 6211-6219 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-29-6211
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