All-optical multi-level phase quantization based on phase sensitive amplification with low-order harmonics

Abstract

A novel scheme is proposed for all-optical multi-level phase quantization by mixing two lower-order harmonics, rather than mixing the signal with its conjugate (M−1)th harmonic, which is difficult to be generated but necessary for the traditional quantization method. The low-order harmonics used in the proposed scheme are determined as the conjugate (M/2−1)th and the (M/2+1)thharmonics for M=4n , or the conjugate (M/2−2)th and the (M/2+2)th harmonics for M=4n+2, or the conjugate [(M−1)/2]th and the [(M+1)/2]th harmonics for M=2n+1, n=1,2,3…The simulations show the effectiveness of the scheme for the eight- and nine-level all-optical phase quantization. Furthermore, the application of the scheme to the all-optical phase regeneration is validated. An improved method with two cascading stages is also proposed and validated to achieve a monotonic step-like phase–phase transfer characteristic for the optimized all-optical phase quantization. This proposed scheme provides a new way for multi-level phase quantization and multi-level phase shift keying regeneration to meet the ever increasing demand for the bandwidth in fiber optic communications.

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Identifiers

ORCID for G.S. Murugan: orcid.org/0000-0002-2733-3273

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