Single-pixel optical modulation analyzer based on phase retrieval for dual-polarization IQ modulators

Author:

Yoshida YukiORCID,Yoshida Setsuo1,Oda Shoichiro1,Hoshida Takeshi1ORCID,Yamamoto Naokatsu,Kanno Atsushi2

Affiliation:

1. Fujitsu Limited

2. Currently with Nagoya Institute of Technology

Abstract

In-service monitoring and adaptive digital compensation of analog imperfections in optical transponders are vital in the next-generation optical coherent transmission systems employing extremely high-order, high-speed modulation formats. A notable example of such analog impairments is the imbalance of amplitude, phase, and/or timing between the in-phase (I) and quadrature (Q) tributaries in an optical IQ modulator, namely the IQ imbalance. Recently, an IQ-imbalance estimation technique based on phase retrieval without using a coherent receiver, the so-called single-pixel optical modulation analyzer (SP-OMA), has been proposed as an affordable in-service monitoring solution for the frequency-dependent IQ imbalance in a (single-polarization) IQ modulator. In this work, we extend the concept of the SP-OMA to dual-polarization IQ modulators. A novel phase retrieval algorithm with an alternating minimization procedure is proposed for identifying the frequency-dependent IQ imbalances on both polarization channels simultaneously from a single photodetector output. The validity and feasibility of the proposed SP-OMA for a dual-polarization IQ modulator are demonstrated numerically and experimentally with a 63.25-Gbaud DP-16QAM signal.

Funder

National Institute of Information and Communications Technology

Japan Society for the Promotion of Science

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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