A novel high-speed and wavelength insensitive Y-branch Modulator with reduced and controllable chirp

We propose and demonstrate a novel high-speed and wavelength insensitive Y- branch Modulator in InGaAsP multiple-quantum-wells that exhibits negligible chirp and is also suitable for achieving controllable chirp. We raise the refractive index on one arm via applied bias and use the unbiased arm as a modulator. As the light switches to the biased arm, the modulated light in the unbiased arm experiences little phase change and therefore exhibits neg ligible chirp. Tunable chirp may be achieved using a push-pull bias configu ration, We demonstrate that our modulator chirp is similar to 10 times lowe r than that of typical electroabsorption modulators.