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Low-loss fibre-coupled waveguide directional coupler modulator

Low-loss fibre-coupled waveguide directional coupler modulator

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We report a fibre-coupled Ti: LiNbO3 directional coupler modulator with total fibre-device-fibre insertion loss as low as 1.5 dB for λ=1.32 μm. Low loss has been achieved by using diffusion parameters to give good mode match to the fibre and low propagation loss, an effective SiO2 buffer layer to eliminate electrode loading loss and a directional coupler geometry which minimises the effect of bend loss.

References

    1. 1)
      • Optical properties of Ti: diffused LiNbO3 strip waveguides and their coupling-to-a-fiber characteristics
    2. 2)
      • High efficiency flip-chip coupling between single-mode fibers and LiNbO3 channel waveguides
    3. 3)
      • Experimental integrated optic circuit losses and fibre pigtailing of chips
    4. 4)
      • Single-mode fiber to titanium diffused lithium niobate waveguide coupling
    5. 5)
      • High efficiency single-mode fiber to Ti: LiNbO3 waveguide coupling
    6. 6)
      • Traveling wave optical modulator using a directional coupler LiNbO3 waveguide
    7. 7)
      • Calibration of optical modulator frequency response with application to signal level control
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19820333
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