Abstract
We describe in more detail a novel InP-based comb generator for optical
orthogonal frequency division multiplexed (OFDM) transmission. The device
integrates a Mach–Zehnder interferometer inside an amplified ring. In
order to maximize the number of lines in the spectrum, the phase modulators
were designed with a 3-step asymmetric quantum well structure to maximize
the index change with voltage change. We demonstrate a 6-line frequency comb
which is tunable over 80 nm. The linewidth of the comb is limited by only
the input laser, which makes this device especially suitable for coherent
optical OFDM applications.
© 2011 IEEE
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