Monolithically integrated detector chip for a two-channel unidirectional WDM link at 1.5 mu m

The fabrication and operation of a monolithically integrated InGaASP/InP wavelength division multiplexing (WDM) detector chip is reported. It consists of a Y-branch grating demultiplexer and two p-i-n photodiodes. Polarization-independent operation for two closely spaced channels ( Delta lambda =3.6...

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Bibliographic Details
Published in:IEEE journal on selected areas in communications 1990-08, Vol.8 (6), p.1183-1189
Main Authors: Winzer, G., Doldissen, W., Cremer, C., Fiedler, F., Heise, G., Kaiser, R., Marz, R., Mahlein, H.F., Morl, L., Nolting, H.-P.J., Rehbein, W., Schienle, M., Schulte-Roth, G., Unterborsch, G., Unzeitig, H., Wolff, U.
Format: Article
Language:English
Subjects:
Applied sciences
Attenuation
Bandwidth
Bragg gratings
Crosstalk
Detectors
Exact sciences and technology
Fabrication
Indium phosphide
PIN photodiodes
Polarization
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Wavelength division multiplexing
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Summary:The fabrication and operation of a monolithically integrated InGaASP/InP wavelength division multiplexing (WDM) detector chip is reported. It consists of a Y-branch grating demultiplexer and two p-i-n photodiodes. Polarization-independent operation for two closely spaced channels ( Delta lambda =3.6 nm) at lambda =1.5 mu m was obtained. In polarization-independent operation, 1.3-mm-long Bragg gratings on buried waveguides showed a peak crosstalk attenuation of 15 dB and a stop bandwidth of 0.2 nm at -10 dB. These values show the high potential of Bragg grating devices for dense wavelength division multiplexing applications. The static electrical properties of the monolithically integrated p-i-n photodiodes (dark current of 2-5 nA at -10 V, breakdown voltage of 45-65 at a 10 mu A leakage current) approach the values obtained for discrete devices. The bandwidth of 420 MHz enables operation in the 600-Mbaud region. The external quantum efficiency of the complete detector chip ( eta =0.08) is still rather small. However, it could be considered sufficient for the operation of such devices in local networks with distances of a few kilometers.< >
ISSN:0733-8716
1558-0008
DOI:10.1109/49.57825