Optical amplification system

Details Optical amplification system Optical amplification system

1994-11-04

1996-12-31

Moskowitz, Nelson

Optical: systems and elements

Optical amplifier

Particular pumping type

359341, 359348, 372 71, G02B 600, H01S 3131, H04B 900

Patent

active

055899757

ABSTRACT:
An optical amplification system capable of operating without being affected by the waveform of the incoming optical signal is provided for amplifying the optical signal in its optical waveguide by the effect of stimulated emission of a fluorescent substance induced by pumped light. According to a first aspect of the invention, an optical amplification system turns on its pumping source 8 when there is an optical signal s1 in the optical waveguide 5 whereas the pumping source 8 is kept off as long as no optical signal s1 is found in the optical waveguide 5 so that, when the pumping source 8 is turned on, pumped light from the pumping source 8 is fed to the optical waveguide 5 with a delay of time relative to the incoming optical signal s1. According to a second aspect of the invention, the inside of the optical waveguide 5 is constantly kept under an excited condition so that, when no optical signal s1 is found in the optical waveguide 5, dummy light s3 is fed to the optical waveguide 5, whereas no dummy light s3 is fed to the optical waveguide 5 once an optical signal s1 is introduced to the optical waveguide 5. With such an arrangement, since no optical amplification takes place at the rising edge of an incoming optical signal and hence the operation of optical amplification is not dependent on the waveform of the incoming optical signal, a safe and stable optical amplification system can be established.

REFERENCES:
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patent: 4812776 (1989-03-01), Sasaki
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patent: 5003268 (1991-03-01), Tsuchiya
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patent: 5117303 (1992-05-01), Deservire et al.
patent: 5177634 (1993-01-01), Way
Tomofuji, H. et al, "Cumulative Waveform Distortion in Cascaded Optical Amplifier Repeaters for Multigigabit IM/DD Systems", OEC '90, Tokyo, 1990.
Laning et al, IEEE Photonics Technology Lett., (USA), vol. 3, No. 3, pp. 253-255, Mar. 1991.

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