Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-11-21
1993-07-06
Coles, Sr., Edward L.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, H04B 1012
Patent
active
052259226
ABSTRACT:
Increasing the capacity of an existing lightwave transmission system can be accomplished by either increasing the bit rate or adding wavelength-multiplexed channels. Recent advances in erbium-doped fiber amplifier technology make the wavelength division multiplexed option particularly attractive. Unfortunately, because of nonuniform wavelength-dependent gain profile and saturation characteristic of erbium-doped fiber amplifiers, each channel of a wavelength-multiplexed system will experience a different optical gain which, in turn, can result in an excessive bit-error-rate performance in some channels. This invention is directed toward processing apparatus which selectively equalizes the optical gain or the optical signal-to-noise ratios of the channels of a wavelength-multiplexed optical transmission system. The output powers and the signal-to-noise ratios are selectively equalized by adjusting the optical input signal powers. With this invention, wavelength-multiplexed channels can be added to an existing optical fiber transmission system without requiring new optical components, upgrades or adjustments at intermediate amplifier sites.
REFERENCES:
patent: Re33474 (1990-12-01), Schembri
patent: 5060302 (1991-10-01), Grimes
Chraplyvy Andrew R.
Nagel Jonathan A.
Tkach Robert W.
AT&T Bell Laboratories
Coles Sr. Edward L.
Pascal L.
Weiss E.
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