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Conference on Lasers and Electro-Optics

Optical Filter Optimization Using Phase-Sensitive Amplification with Unequalized Signal/Idler Inputs

Anjali Agarwal, James M. Dailey, Colin J. McKinstrie, P. Toliver

Published Jan 1, 2016• 1 citation
Publisher

Abstract

We demonstrate a novel optical filter employing amplification and de-amplification in a phase-sensitive amplifier with enhanced optical extinction ratios through signal/idler input power imbalance. Optimal power imbalance enables 60 dB rejection in the RF domain.
DOI
10.1364/cleo_si.2016.sth3f.5

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We present a novel optical filter based on amplification and deamplification in a phase-sensitive amplifier (PSA), whose out-of-band rejection is enhanced by slightly imbalancing the inputs to the PSA. The out-of-band rejection of the PSA-based filter with balanced input signal and idler powers is given by G2 in the optical domain, where G is the maximum phase-sensitive gain. By unbalancing the input to the PSA, the optical out-of-band rejection is significantly enhanced beyond G2, thus enabling filters with high rejection even with moderate-gain PSAs. We demonstrate a filter with optical and electrical extinctions of 29 dB and 60 dB, respectively, using a moderate PSA gain of only 10 dB. Further, this technique allows for ultrawideband frequency tuning, spanning multiterahertz bandwidths along with filter response reconfigurability. These novel concepts will be invaluable for optical signal processing in high-performance analog and digital systems.
A cascaded parametric amplifier consists of a first parametric amplifier, which amplifies an input signal and generates an idler, which is a copy of the signal, a signal processor, which controls the phases of the signal and idler, and a second parametric amplifier, which combines the signal and idler in a phase-sensitive manner. In this paper, cascaded parametric amplification is modeled and the conditions required to maximize the constructive-destructive extinction ratio are determined. The results show that a cascaded parametric amplifier can be operated as a filter: A desired signal-idler pair is amplified, whereas undesired signal-idler pairs are deamplified. For the desired signal and idler, the noise figures of the filtering process (input signal-to-noise ratio divided by the output ratios) are only slightly higher than those of the copying process: Signal-processing functionality can be achieved with only a minor degradation in signal quality.
We investigate the beating of signal and idler waves, which have imbalanced signal to noise ratios, in a phase-sensitive parametric amplifier. Imbalanced signal to noise ratios are achieved in two ways; first by imbalanced noise loading; second by varying idler to signal input power ratio. In the case of imbalanced noise loading the phase-sensitive amplifier improved the signal to noise ratio from 3 to 6 dB, and in the case of varying idler to signal input power ratio, the signal to noise ratio improved from 3 to in excess of 20 dB.