Birefringence compensation, improved fringe contrast and trimming in an integrated asymmetric Mach–Zehnder interferometer using mid-IR laser processing

Tuning of an asymmetric Mach–Zehnder interferometer using mid-IR laser radiation is demonstrated. The device birefringence is compensated for by processing at the surface above one of the arms with 10.6 μm light from a CO 2 laser. The spectral contrast of the component is improved from ∼7 to ∼12 dB...

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Bibliographic Details
Published inOptical materials Vol. 14; no. 2; pp. 175 - 183
Main Authors Canning, J, Åslund, M
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.05.2000
Subjects
Ablation
Birefringence
Integrated optics
Laser materials-processing applications
Optical waveguides
Photothermal effects
Integrated optics
Photothermal effects
Birefringence
Ablation
Laser materials-processing applications
Optical waveguides
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Summary:Tuning of an asymmetric Mach–Zehnder interferometer using mid-IR laser radiation is demonstrated. The device birefringence is compensated for by processing at the surface above one of the arms with 10.6 μm light from a CO 2 laser. The spectral contrast of the component is improved from ∼7 to ∼12 dB for the TE and TM eigenstates, respectively to ∼20 dB for both eigenstates by balancing the optical energy in each arm before the output coupler.
ISSN:0925-3467
1873-1252
DOI:10.1016/S0925-3467(99)00127-5