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We propose a new InP-based comb generator for optical OFDM transmission. The device integrates a Mach-Zehnder modulator inside an amplified ring. We demonstrate a 6-line frequency comb which is tunable in wavelength and spacing.
A vertical thermo-optic modulator based on temperature-dependent absorption is demonstrated on a Ge resistive-heating structure. The contrast ratio is 5.4 dB peaked at 1553 nm and exceeds 3 dB for 15 nm range under a 1 V low operation voltage (0.7 mW heating power). With heating power increases from 0.7 to 4 mW, the response time reduces from 600 to 240 ns, and the peak contrast reaches 7.1 dB at...
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