CW wavelength = 1594nm CW input power = 10mW Waveguide length =~1cm Waveguide width = 4um Material = AlGaAs (Aluminum Galium Arsenide) Other dimension: unknown. Coupling: fiber - waveguide - fiber Venue: SF-4107 Fiber optics communcation laboratory, University of Toronto The mode image is magnified because the objective is placed in such a position that fringes can be observed. Note that the fringes from the input lensed fiber are passed through the waveguide because the waveguide is to transmitting lights. There is no linear lens effect in the waveguide. The vertical position of the middle stage of Newport Ultralign 561 middle stage is being tuned: 1. The taper tip of the lensed fiber is above the waveguide. The light is reflected from the surface of the waveguide. The bottom screen is bright because the image is inverted by the convex lens. 2. The waveguide is raised such that the taper tip of the lensed fiber is on the same level of the guiding layer. The light from the lensed fiber is guided by the waveguide, and a bright circular (with fringes) appears at the output. 3. The waveguide is still raised such that the taper tip is pointing the substrate. Larger circular fringes can be observed, which is due to the input light from the lensed fiber. 4. The waveguide is being raised. Horizontal fringes appear due to the reflection of light inside the substrate, leading the interference pattern. The above steps are being reversed in the video, and the mode image is formed at ...
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