Optical: systems and elements – Optical amplifier – Optical fiber
Patent
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.
DiGiovanni David J.
Giles Clinton R.
AT&T Bell Laboratories
Lee John D.
Ngo John
Weiss Eli
LandOfFree
Multi-stage optical fiber amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-stage optical fiber amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-stage optical fiber amplifier will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1693029