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Fabricated device. (a) Optical micrograph of the device around the LSPCW. (b) Magnified image around the heaters. (c) Magnified image of the LSPCW.
Temperature distribution with heating. (a) Calculated three-dimensional distribution. (b) One-dimensional distribution at waveguide center (dotted in (a)) when a pair of heaters are heated. (c) The same as (b) when three pairs are heated. Solid line and circular plots depict simulation and measurement, respectively.
Delay spectra for various heating patterns. (a) No heating. (b)-(e) With heating. The seven squares above the plot indicate the heating power of each heater.
Generation of various wavelength delay dispersion. Black lines show raw data, while the red lines and values [ps/nm] are averaged values within the 3 nm bandwidth. Heater powers are indicated by colors as in Fig. 3.
Pulse compression by wavelength dispersion compensation. Red and blue lines denote auto-correlation waveforms of pre-chirped pulses after and before passing through the device, respectively. Gray lines denote chirp-free pulses. (a) Pulses are positively pre-chirped and (b) negatively pre-chirped.
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