Multi-stage optical fiber amplifier

Details Multi-stage optical fiber amplifier Multi-stage optical fiber amplifier

1990-06-22

1991-09-24

Lee, John D.

Optical: systems and elements

Optical amplifier

Optical fiber

385 24, 385 27, 372 6, 385142, G02B 626

Patent

active

050509497

ABSTRACT:
In this invention there is disclosed a multi-stage optical fiber amplifier for providing a new functon, that of gain equalization. The disclosed multi-stage optical fiber amplifier comprises at least two stages of amplification where each stage comprises an amplifying fiber having a different gain spectrum. In one embodiment the two stages, which can be pumped separately, have different dopant compositions to provide each stage with a different gain spectrum. The disclosed multi-stage optical fiber amplifier provides overall gain spectrum equalization of the amplified channels of long haul transmission lines. Typically, gain equalization can adjust the gain of one channel while maintaining the gain of a second channel constant. When used in combination with automatic gain control, the amplifier gain can be equalized dynamically to compensate for random variations in the relative optical power of wavelength-multiplexed signals to prevent system impairment caused by low-power channels.

REFERENCES:
patent: 4723824 (1988-02-01), Shaw et al.
patent: 4883335 (1989-11-01), Alferness et al.
patent: 4952017 (1990-08-01), Henry et al.
Masuda et al., "High Gain Two Stage Amplification with Erbium-Doped Fiber Amplifier", Electronic Letters, 10th May 1990, vol. 26, No. 10, pp. 661-662.

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