Gain properties and optical-feedback suppression of asymmetrical curved active waveguides

doi:10.1007/s12200-009-0065-1

Front Optoelec Chin

2009, Vol. 2

Issue (4) : 379-383 https://doi.org/10.1007/s12200-009-0065-1

RESEARCH ARTICLE

Gain properties and optical-feedback suppression of asymmetrical curved active waveguides

Zigang DUAN¹(

), Wei SHI², Yan LI³, Guangyue CHAI¹

1. Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, Shenzhen University, Shenzhen 518060, China; 2. Electrical and Computer Engineering Department, University of British Columbia, Vancouver V6R 1T3, Canada; 3. School of Science,Xi’an Shiyou University, Xi’an 710065, China

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Abstract

Elaborately-designed asymmetrical curved active waveguides are introduced to improve the gain properties of semiconductor optical amplifiers (SOAs) by internal distributed optical-feedback suppression. An analytical model of the double-energy-level system is utilized in the simulation and designed by the finite difference time domain (FDTD) method. Under a 280 mA driving current, the optimized curved SOA with the simple device structure without isolators performs a more than 18 dB fiber-to-fiber gain, 980 mW spontaneous emission power, and 13 dBm saturation power.

Keywords curved active waveguide feedback restrain semiconductor optical amplifier (SOA)

Corresponding Author(s): DUAN Zigang,Email:zgduan@szu.edu.cn

Issue Date: 05 December 2009

Cite this article:

Zigang DUAN,Wei SHI,Yan LI, et al. Gain properties and optical-feedback suppression of asymmetrical curved active waveguides[J]. Front Optoelec Chin, 2009, 2(4): 379-383.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0065-1
https://academic.hep.com.cn/foe/EN/Y2009/V2/I4/379

Fig.1 Schematic of asymmetrical active waveguide

Fig.2 Calculation model

Tab.1 Dielectric constants () used in calculation

Tab.2 Geometrical parameters used in calculation

Fig.3 (real line) and (dashed line) of three representative configurations. (a) = 19.5 μm, = 194.5 μm; (b) = 76.5 μm, = 139.1 μm; (c) = 93.1 μm, = 64.2 μm

Fig.4 Photograph of curved SOA chip being aligned with coupling fibers

Fig.5 Photograph of curved SOA device after package

Fig.6 - and - curve

Fig.7 Amplified spontaneous emission spectrum under a 300 mA driving current

Fig.8 Small-signal gain, as a function of driving current, with 4 μW input signal

Fig.9 Gain, as a function of output power

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