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We describe a photonic integrated circuit composed of a distributed Bragg reflector laser and a fast monitoring photodiode operating at 1.54 μm wavelength. The integrated waveguide photodiode has a 3 dB bandwidth of 2 GHz with 1.2 mA/mW responsivity. We demonstrate ‘‘on chip’’ monitoring of a digitally modulated laser signal at 2 Gbit/s.
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Koren et al. (1991) studied this question.
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