Transfer of repeater information signals in in-line optical amplifier repeater system
AssigneeNEC Corporation
InventorSatoshi Hamada
Life of this patent
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Abstract
A multi-repeater optical transmission system comprises a plurality of repeaters which are respectively provided with oscillators for generating oscillation waves of different frequencies. The respective oscillation waves are frequency-modulated according to repeater information signals respectively generated in the repeaters. According to the frequency-modulated oscillation waves, respective pumping sources are operated to emit pumping lightwaves for pumping Er-doped fiber amplifiers. The respective pumping lightwaves carrying the repeater information signals are sent out to a transmission line through a wavelength division multiplexing fiber coupler.
Claims23
An optical transmission system comprising a plurality of optical repeaters, each said optical repeater comprising:
- in-line amplifying means for optically amplifying line-signal light, said amplifying means being pumped by pumping light;
- oscillating means for generating an oscillation wave of a frequency different from that of an oscillation wave generated by an oscillating means of another optical repeater, said frequency being determined based on a gain of said in-line amplifying means and a modulation efficiency of said pumping light;
- modulation means for frequency-modulating said oscillation wave based on repeater information which is generated in said optical repeater;
- light-emitting means for generating said pumping light which is modulated according to said oscillation wave frequency-modulated by said modulation means;
- and
- combining means for optically combining said pumping light generated by said light-emitting means with said line-signal light.
In an optical transmission system comprising a plurality of optical repeaters each comprising an optical amplifier for optically amplifying line-signal light and a pumping source for optically pumping said optical amplifier, a repeater information transfer system comprising:
- oscillating means for generating oscillation waves of different frequencies in said optical repeaters, respectively, said frequencies being determined for each of said optical repeaters based on a gain of said optical amplifier of each of said respective optical repeaters and a modulation efficiency of pumping light emitted by said pumping source of each of said respective optical repeaters;
- modulation means for frequency-modulating said oscillation waves based on respective repeater information signals which are generated in said optical repeaters;
- control means for controlling light-emitting operation of said pumping sources according to said oscillation waves frequency-modulated, respectively;
- and
- coupling means for coupling said pumping sources to a transmission line of said optical transmission system, respectively.
In an optical transmission system comprising a plurality of optical repeaters each comprising an optical amplifier for optically amplifying line-signal light and a pumping source for optically pumping said optical amplifier, a repeater information transfer method comprising the steps of:
- generating oscillation waves of different frequencies in said optical repeaters, respectively, said frequencies being determined for each of said optical repeaters based on a gain of said optical amplifier of each of said respective optical repeaters and a modulation efficiency of pumping light emitted by said pumping source of each of said respective optical repeaters;
- frequency-modulating said oscillation waves based on respective repeater information signals which are generated in said optical repeaters;
- controlling light-emitting operation of said pumping sources according to said oscillation waves frequency-modulated, respectively;
- and
- coupling said pumping sources to a transmission line of said optical transmission system, respectively.
Dependencies are inferred from the claim text.