Stable and high-performance multiwavelength erbium-doped fiber laser based on fiber delay interferometer

doi:10.1007/s12200-009-0036-6

Front Optoelec Chin

2009, Vol. 2

Issue (2) : 195-199 https://doi.org/10.1007/s12200-009-0036-6

RESEARCH ARTICLE

Stable and high-performance multiwavelength erbium-doped fiber laser based on fiber delay interferometer

Shuang LIU^1,2(

), Junqiang SUN¹, Ping SHUM²

1. Division of Optoelectronic Devices and Integration, Wuhan National Laboratory for Optoelectronics, Wuhan 430074, China; 2. Network Technology Research Centre, Nanyang Technological University, Singapore 637553, Singapore

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Abstract

In this paper, we proposed a novel scheme to realize the multiwavelength erbium-doped fiber lasers. By adding a length of dispersion shifted fiber (DSF) in the ring cavity, we can suppress the cavity mode competition resulting from homogeneous line broadening (HLB) effect. In addition, a comb filter based on fiber delay interferometer (DI) is used for frequency selecting. To enhance the extinction ratio while maintaining the free space range (FSR), the proposed isolator-assisted double-pass DI is utilized into the laser cavity, and a stable 7-wavelength simultaneous lasing spaced at 21.5 GHz is accordingly achieved with an extinction ratio of higher than 40 dB. The lasers are stable with a maximum power fluctuation per channel of less than 0.6 dB during an hour test.

Keywords multiwavelength erbium-doped fiber laser delay interferometer (DI) dispersion shifted fiber (DSF)

Corresponding Author(s): LIU Shuang,Email:sliu@mail.hust.edu.cn

Issue Date: 05 June 2009

Cite this article:

Shuang LIU,Junqiang SUN,Ping SHUM. Stable and high-performance multiwavelength erbium-doped fiber laser based on fiber delay interferometer[J]. Front Optoelec Chin, 2009, 2(2): 195-199.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-009-0036-6
https://academic.hep.com.cn/foe/EN/Y2009/V2/I2/195

Fig.1 Schematic diagram of DI

Fig.2 Schematic diagram of three types of DI. (a) Single-pass; (b) direct double-pass; (c) isolator-assisted double-pass

Fig.3 Measured transmission spectra of three different types of DI. (a) Single-pass; (b) direct double-pass; (c) isolator-assisted double-pass

Fig.4 Schematic diagram of experimental system

Fig.5 ASE spectrum of EDFA

Fig.6 Output spectra of laser with different DI configurations. (a) Full laser spectrum of direct double-pass DI configuration; (b) close look of laser spectrum of (a) for clearly 11 lasing lines; (c) full laser spectrum of isolator-assisted double-pass DI configuration; (d) close look of laser spectrum of (c) for clearly 8 lasing lines.

Fig.7 Measured linewidth of single lasing mode in different DI configurations. (a) Single-pass; (b) direct double-pass; (c) isolator-assisted double-pass

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