Abstract
We present a highly linear quantum well (QW) optical phase modulator that employs a mixed QW structure. This modulator demonstrated an excellent phase modulation linearity. Its third-order intermodulation intercept point in the optical phase excursion per unit length was measured to be greater than $8\pi $ /mm. The measured optical loss is $\sim 1$ dB/mm. The new phase modulator design should enable a more compact optical phase-locked loop photonic integrated circuit with a wider bandwidth.
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