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Reduced component count optical delay discriminator using a semiconductor optical amplifier-detector

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Abstract

Cross-gain modulation between pairs of counter-propagating pulses within a semiconductor optical amplifier is used as a pulse delay detector. Unlike previous designs based on differential photodiodes, the difference between average powers of the pulse trains after propagation are deduced from the voltage difference between two contacts on the SOA, eliminating the photodiodes and two optical couplers. Simulations show the design can be improved by adding a third contact. The linearity, sensitivity and noise performance of the design equal or surpass the original design.

©2005 Optical Society of America

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Figures (8)

Fig. 1.
Fig. 1. Design of SOA delay discriminator by Awad et al. (optical filters not shown).
Fig. 2.
Fig. 2. Twin-contact design using voltages on contacts to detect delay.
Fig. 3.
Fig. 3. Simplified Schematic from VPIcomponentMaker Active Photonics simulator.
Fig. 4.
Fig. 4. Differential photocurrent for a sinusoidal variation in pulse delay.
Fig. 5.
Fig. 5. Differential contact voltage for the same variation as in Fig. 4.
Fig. 6.
Fig. 6. RMS variation of differential contact voltage versus center contact length.
Fig. 7.
Fig. 7. Linearity of the photodiode and contact schemes.
Fig. 8.
Fig. 8. RF spectrum from the differential photodiodes (left) and differential contacts (right).

Equations (1)

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V = η ( kT q ) ln ( N N i )
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