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Tunable superlattice p-i-n photodetectors: characteristics, theory, and application

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4 Author(s)
Larsson, A. ; Dept. of Electr. Meas., Chalmers Univ. of Technol., Goteborg, Sweden ; Andrekson, P.A. ; Eng, S. ; Yariv, A.

Extended measurements and theory on the recently developed monolithic wavelength demultiplexer consisting of voltage-tunable superlattice p-i-n photodetectors in a waveguide confirmation are discussed. It is shown that the device is able to demultiplex and detect two optical signals with a wavelength separation of 20 nm directly into different electrical channels at a data rate of 1 Gb/s and with a crosstalk attenuation varying between 20 and 28 dB, depending on the polarization. The minimum acceptable crosstalk attenuation at a data rate of 100 Mb/s is determined to be 10 dB. The feasibility of using the device as a polarization angle sensor for linearly polarized light is also demonstrated. A theory for the emission of photogenerated carriers out of the quantum wells is included, since this is potentially a speed limiting mechanism in these detectors. It is shown that a theory of thermally assisted tunneling by polar optical phonon interaction is able to predict emission times consistent with the observed temporal response

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Quantum Electronics, IEEE Journal of  (Volume:24 ,  Issue: 5 )