TY - JOUR
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: songnian@ntu.edu.sg). 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)
UR - http://www.scopus.com/inward/record.url?scp=71049147287&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=71049147287&partnerID=8YFLogxK
U2 - 10.1109/LPT.2006.881672
DO - 10.1109/LPT.2006.881672
M3 - Article
AN - SCOPUS:71049147287
SN - 1041-1135
VL - 18
SP - 1934
EP - 1936
JO - IEEE Photonics Technology Letters
JF - IEEE Photonics Technology Letters
IS - 18
ER -