Abstract

We present in this paper a dc-coupled in-line optical detector based on a multisection semiconductor optical amplifier (SOA). The key principle is to use a voltage reference correlated with the bias voltage level by the way of a two-section or a three-section SOA. So, by means of the differential detection, the signal dc-component is kept with reduced sensitivity to temperature and bias current fluctuations. Experimental and theoretical results are presented when a two-section SOA is used and performance predictions when a three-section is employed. The obtained responsivity is 63 V/W at 40 mA and over 110 V/W at 50 mA when the input optical power, measured within the fiber, is 13 dBm. When the SOA is biased at 40 mA, the detection bandwidth is over 1 GHz when the input optical power is 4 dBm.

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J. Lightwave Technol. (8)

K. Bertilsson, R. R rgren, P. A. Andrekson, and S. T. Eng, "Characterization of an InGaAsP semiconductor laser amplifier as a multifunctional device," J. Lightwave Technol., vol. 11, pp. 1147-1150, July 1993.

J.-C. Simon, "GaInAsP semiconductor laser amplifiers for single-mode fiber communications," J. Lightwave Technol., vol. 5, pp. 1286-1295, Sept. 1987.

N. A. Olsson, "Lightwave systems with optical amplifiers," J. Lightwave Technol., vol. 7, pp. 1071-1082, July 1989.

A. Ehrhardt, M. Eiselt, G. Grobkopf, L. K ller, R. Ludwig, W. Pieper, R. Schnabel, and H.G. Weber, "Semiconductor laser amplifier as optical switching gate," J. Lightwave Technol., vol. 11, pp. 1287-1295, Aug. 1993.

M. Gustavsson, A. Karlsson, and L. Thyle n, "Traveling wave semiconductor laser amplifier detectors," J. Lightwave Technol., vol. 8, pp. 610-617, Apr. 1990.

J. Wang, H. Olesen, and K. E. Stubkjaer, "Recombination, gain and bandwidth characteristics of 1.3- m semiconductor laser amplifiers," J. Lightwave Technol., vol. 5, pp. 184-189, Jan. 1987.

P. Brosson, "Analytical model of a semiconductor optical amplifier," J. Lightwave Technol., vol. 12, pp. 49-54, Jan. 1994.

T. Durhuus, B. Mikkelsen, and K. E. Strubkjaer, "Detailed dynamic model for semiconductor optical amplifiers and their crosstalk and intermodulation distortion," J. Lightwave Technol., vol. 10, pp. 1056-1064, Aug. 1992.

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