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Differential Modal Gain Reduction using a Void Inscribed in a Two-Mode-Erbium Doped Fiber | IEEE Conference Publication | IEEE Xplore

Differential Modal Gain Reduction using a Void Inscribed in a Two-Mode-Erbium Doped Fiber


Abstract:

Differential modal gain (DMG) reduction technique that uses laser-inscribed void is proposed. We reveal that DMG can be successfully controlled by introducing one void in...Show More

Abstract:

Differential modal gain (DMG) reduction technique that uses laser-inscribed void is proposed. We reveal that DMG can be successfully controlled by introducing one void into two-mode-EDF while keeping the initial gain, NF and flatness. © 2020 Author(s).
Date of Conference: 08-12 March 2020
Date Added to IEEE Xplore: 04 May 2020
ISBN Information:
Conference Location: San Diego, CA, USA
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan

1. Introduction

Mode division multiplexing (MDM) transmission is a candidate for realizing transmission capacities above 100 Tb/s/fiber. In an MDM system, differential modal gain (DMG) among transmission modes in a few-mode optical amplifier severely degrades system performance [1]. There are three major techniques for controlling DMG in a few-mode amplifier. First technique controls the mode content of the pump light [2]. Second technique manages the electric field distribution of each transmission mode by means of the refractive index profile (e.g. ring core Erbium doped fiber (EDF) [3]). Final one tailors the spatial distribution of Erbium dopant [4]. DMG values of less than 1 dB have been achieved with these techniques. However, the first approach needs additional optical components and the other two methods require complex design and precise fabrication of the EDF. Femto-second laser inscription is now attracting much attention as a technique for realizing a smooth refractive index change [5], birefringent refractive index modification [6], and empty void [7] within glass. It has been also reported that laser inscription enabled to attenuate a particular core in a multi-core fiber [8].

Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan
Access Network Service Systems Labs., NTT Corporation, Tsukuba, Ibaraki, Japan

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