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.
Highlights
The comparison of phase and timing of modulated optical waveforms is critical to the design of all-optical clocks using phase-locked loops [1]
Awad et al [2] have proposed a novel device for measuring the delay between two pulse trains using cross-gain modulation in a Semiconductor Optical Amplifier (SOA)
The two pulse trains are injected into opposite ends of the SOA, so that they counter-propagate
Summary
The comparison of phase and timing of modulated optical waveforms is critical to the design of all-optical clocks using phase-locked loops [1]. Awad et al [2] have proposed a novel device for measuring the delay between two pulse trains using cross-gain modulation in a Semiconductor Optical Amplifier (SOA). In their design, the two pulse trains are injected into opposite ends of the SOA, so that they counter-propagate. This uses the difference in the contact voltages on a 2-section SOA to deduce the relative powers exiting the SOA. If a long 3-contact is introduced between end electrodes of SOA, the sensitivity of the scheme can be improved and made independent of input power
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