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Semiconductor optical amplifier used as an in-line detector with the signal DC-component conservation

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3 Author(s)
Rampone, T. ; Lab. RESO, Ecole Nat. d''Ingenieurs de Brest, France ; Hong-Wu Li ; Sharaiha, A.

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 VNV at 40 mA and over -110 VNV 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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Lightwave Technology, Journal of  (Volume:16 ,  Issue: 7 )