Measurement of SOA linewidth enhancement factor with a sagnac fiber loop

Songnian Fu; Weihong Du; P. Shum; Chongqing Wu; Liren Zhang

doi:10.1109/LPT.2006.881672

Measurement of SOA linewidth enhancement factor with a sagnac fiber loop

Songnian Fu
, Weihong Du
, P. Shum
, Chongqing Wu
, Liren Zhang

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

We demonstrate a novel method to measure the linewidth enhancement factor (α-factor) of the semiconductor optical amplifier (SOA). We derived theoretically the quantitative relationships among the α-factor, the cross-gain modulation, the cross-phase modulation, and the contrast ratio of an SOA-based Sagnac fiber loop. We found that the α-factor value can be calculated directly from the maximum power contrast ratio measurement. Our experiment results show that the obtained α-factor fluctuates within a small range of 5.23 to 6.83 when the bias current varies from 130 to 240 mA. Compared with existing measurement methods, our method is more attractive because of its simple configuration and better stability.

Original language	English
Pages (from-to)	1934-1936
Number of pages	3
Journal	IEEE Photonics Technology Letters
Volume	18
Issue number	18
DOIs	https://doi.org/10.1109/LPT.2006.881672
Publication status	Published - Sept 15 2006
Externally published	Yes

Keywords

Linewidth enhancement factor (α-factor)
Phase modulation
Sagnac fiber loop
Semiconductor optical amplifier (SOA)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Electrical and Electronic Engineering

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10.1109/LPT.2006.881672

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title = "Measurement of SOA linewidth enhancement factor with a sagnac fiber loop",

abstract = "We demonstrate a novel method to measure the linewidth enhancement factor (α-factor) of the semiconductor optical amplifier (SOA). We derived theoretically the quantitative relationships among the α-factor, the cross-gain modulation, the cross-phase modulation, and the contrast ratio of an SOA-based Sagnac fiber loop. We found that the α-factor value can be calculated directly from the maximum power contrast ratio measurement. Our experiment results show that the obtained α-factor fluctuates within a small range of 5.23 to 6.83 when the bias current varies from 130 to 240 mA. Compared with existing measurement methods, our method is more attractive because of its simple configuration and better stability.",

keywords = "Linewidth enhancement factor (α-factor), Phase modulation, Sagnac fiber loop, Semiconductor optical amplifier (SOA)",

author = "Songnian Fu and Weihong Du and P. Shum and Chongqing Wu and Liren Zhang",

note = "Funding Information: Manuscript received April 11, 2006; revised June 15, 2006. This work was supported in part by the project M47040039 of Agency for Science, Technology and Research (A STAR), Singapore. S. Fu, W. Du, P. Shum, and L. Zhang are with the Network Technology Research Centre, Nanyang Technological University, Singapore 637553, Singapore (e-mail: [email protected]). C. Wu is with the School of Science, Beijing Jiaotong Unviersity, Beijing 100081, China. Digital Object Identifier 10.1109/LPT.2006.881672 Fig. 1. Experimental setup used for the -factor measurement. D1: Photodetector 1. D2: Photodetector 2. SMF: single-mode fiber. PC: polarization controller.",

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doi = "10.1109/LPT.2006.881672",

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T1 - Measurement of SOA linewidth enhancement factor with a sagnac fiber loop

AU - Fu, Songnian

AU - Du, Weihong

AU - Shum, P.

AU - Wu, Chongqing

AU - Zhang, Liren

N1 - Funding Information: Manuscript received April 11, 2006; revised June 15, 2006. This work was supported in part by the project M47040039 of Agency for Science, Technology and Research (A STAR), Singapore. S. Fu, W. Du, P. Shum, and L. Zhang are with the Network Technology Research Centre, Nanyang Technological University, Singapore 637553, Singapore (e-mail: [email protected]). C. Wu is with the School of Science, Beijing Jiaotong Unviersity, Beijing 100081, China. Digital Object Identifier 10.1109/LPT.2006.881672 Fig. 1. Experimental setup used for the -factor measurement. D1: Photodetector 1. D2: Photodetector 2. SMF: single-mode fiber. PC: polarization controller.

PY - 2006/9/15

Y1 - 2006/9/15

N2 - We demonstrate a novel method to measure the linewidth enhancement factor (α-factor) of the semiconductor optical amplifier (SOA). We derived theoretically the quantitative relationships among the α-factor, the cross-gain modulation, the cross-phase modulation, and the contrast ratio of an SOA-based Sagnac fiber loop. We found that the α-factor value can be calculated directly from the maximum power contrast ratio measurement. Our experiment results show that the obtained α-factor fluctuates within a small range of 5.23 to 6.83 when the bias current varies from 130 to 240 mA. Compared with existing measurement methods, our method is more attractive because of its simple configuration and better stability.

AB - We demonstrate a novel method to measure the linewidth enhancement factor (α-factor) of the semiconductor optical amplifier (SOA). We derived theoretically the quantitative relationships among the α-factor, the cross-gain modulation, the cross-phase modulation, and the contrast ratio of an SOA-based Sagnac fiber loop. We found that the α-factor value can be calculated directly from the maximum power contrast ratio measurement. Our experiment results show that the obtained α-factor fluctuates within a small range of 5.23 to 6.83 when the bias current varies from 130 to 240 mA. Compared with existing measurement methods, our method is more attractive because of its simple configuration and better stability.

KW - Linewidth enhancement factor (α-factor)

KW - Phase modulation

KW - Sagnac fiber loop

KW - Semiconductor optical amplifier (SOA)

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JO - IEEE Photonics Technology Letters

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Measurement of SOA linewidth enhancement factor with a sagnac fiber loop

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Keywords

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