Abstract

A low noise figure (NF), all-optical gain-clamped C+L band erbium-doped fiber amplifier (EDFA) has been demonstrated. A parallel configuration is employed to avoid the crosstalk between the C- and L-band signals. Half of the amplified spontaneous emission from the output signal is filtered by an interleaver and fed back to the parallel EDFA to form lasing cavity. Two lasers in the C- and L-band, respectively, formed in the cavity clamp the C- and L-band signals simultaneously. In the L-band, the double-pass configuration with a fiber Bragg grating is used to improve the gain and NF. Furthermore, co-propagation of the signal and the lasing power leads to a low NF, while the amplified signals are exported separately from the lasing power. Finally, a wide gain-clamping range up to -10dBm and ~5.5dB NF are obtained.

© 2005 Optical Society of America

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References

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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]

Gain-clamped erbium-doped fiber-ring las

L.L. Yi, L. Zhan, Q.H.Ye, X.Hu, and Y.X.Xia, �??Gain-clamped erbium-doped fiber-ring lasing amplifier with low noise figure by using an interleaver,�?? IEEE Photon. Technol. Lett. 15, 1695-1697(2003).
[CrossRef]

IEEE Photon. Technol. Lett.

L.L. Yi, L. Zhan, J.H.Ji, Q.H.Ye, and Y.X.Xia, �??Improvement of gain and noise figure in double-pass L-band EDFA by incorporating a fiber Bragg grating,�?? IEEE Photon. Technol. Lett. 16, 1005-1007(2004).
[CrossRef]

M. Cai, X.Liu, J.Cui, P.Tang, D.Liu, J.Peng, �??Study on noise characteristic of gain-clamped erbium-doped fiber-ring lasing amplifier,�?? IEEE Photon. Technol. Lett. 9, 1093- 1095(1997).
[CrossRef]

IEEE. Photon. Technol. Lett.

Q. F. Jiang, X. M. Liu, Q. Wang, and X. Feng, �??Dynamically gain control in the serial structure C+L wideband EDFA,�?? IEEE. Photon. Technol. Lett. 16, 87-89(2004).
[CrossRef]

Opt. Amplifiers and Their Apps. 1996

B. Clesca, �??Flat-gain amplifiers and transmission in WDM networks,�?? Tech. Dig. Optical Amplifiers and their Applications, Monterey, CA, Paper FA1, 54�??57(1996).

Opt. Commun.

Y.H. Lu, Ling-Hui Su, Yung-Kuang Chen, �??Optically gain-clamped wideband erbium-doped fiber amplifier using a common figure-eight feedback-loop lasing light,�?? Opt. Commun. 229, 293-298(2002).

Yung-Hsin Lu, Sien Chi, �??All-optical gain-clamped wideband serial EDFA with ring-shaped laser,�?? Opt. Commun. 229, 317-323(2004).
[CrossRef]

Opt. Laser Technol.

Chun Jiang, Weisheng Hu, Qingji Zeng, Shilin Xiao, �??Novel split-band erbium-doped fiber amplifier,�?? Opt. Laser Technol. 35, 251-256(2003).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

The experimental setup

Fig. 2.
Fig. 2.

The laser spectrum

Fig. 3.
Fig. 3.

The gain and the NF versus input signal powers at1550.063 nm and 1580.576 nm, respectively.

Fig. 4.
Fig. 4.

The gain and NF variations with the input signal wavelength

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