Measurement of differential mode delay using reference-free low-coherence digital holography

Shogo Hoshino; Atsushi Okamoto; Yuta Goto; Kazuhisa Ogawa; Akihisa Tomita; Yuta Wakayama; Takehiro Tsuritani

doi:10.1117/12.2288096

29 January 2018 Measurement of differential mode delay using reference-free low-coherence digital holography

Shogo Hoshino, Atsushi Okamoto, Yuta Goto, Kazuhisa Ogawa, Akihisa Tomita, Yuta Wakayama, Takehiro Tsuritani

Author Affiliations +

Proceedings Volume 10561, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VII; 105610D (2018) https://doi.org/10.1117/12.2288096
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

In the mode division multiplexing (MDM) system, differential mode delay (DMD) restricts the quality of transmission. Thus, it is necessary to precisely measure DMD for compensation and system design. The DMD measurement method using low-coherence digital holography (LCDH) has been proposed. This method can obtain not only accurate DMD but also spatial mode fields. However, in this method, an SMF as the reference arm is needed and its length should be particularly adjusted to a fiber under test (FUT) for low-coherence interferometric measurement. We propose a DMD measurement method by reference-free low-coherence digital holography (RF-LCDH). In the proposed method, we generate a new optical path from the light emitted from the FUT, which is regard as internal-reference light. The proposed method enables us to obtain DMD and spatial mode fields without the SMF as the reference arm by using internal-reference light. In the experiment, we measured DMD of a 10-mode fiber to confirm the basic operation of the proposed method. As the result, without using additional SMFs for reference arm, the proposed method achieved the measurement accuracy which was in good agreement with that of the conventional method.

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Shogo Hoshino, Atsushi Okamoto, Yuta Goto, Kazuhisa Ogawa, Akihisa Tomita, Yuta Wakayama, and Takehiro Tsuritani "Measurement of differential mode delay using reference-free low-coherence digital holography", Proc. SPIE 10561, Next-Generation Optical Communication: Components, Sub-Systems, and Systems VII, 105610D (29 January 2018); https://doi.org/10.1117/12.2288096

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