Back to results
US 8,275,264 B2Granted
Optical waveform controlling apparatus
AssigneeFujitsu Limited
InventorShigeki Watanabe
Life of this patent
Estimating the term…
Abstract
According to an aspect of an embodiment, an apparatus for controlling optical waveform, comprises: an input port for inputting a signal light having a modulating frequency and a signal light power; a pump light generator generating pulsed pump light having a frequency higher than the modulating frequency of the signal light and a pulsed pump light power; a nonlinear optical medium for transmitting the signal light from the input port and the pulsed pump light, the nonlinear optical medium having a gain of the signal light based on a nonlinear optical effect; and a power adjustor for adjusting a gain of the signal light saturates in the nonlinear optical medium by a nonlinear optical effect by adjusting at least one of the signal light power or the pulsed pump light power.
Claims17
An apparatus for controlling optical waveform, comprising:
- an input port which inputs a signal light having a modulating frequency and a signal light power;
- a pump light generator which generates a pulsed pump light having a pulsed pump light power and a frequency that is 1.5 times higher, or more, than the modulating frequency of the signal light;
- a nonlinear optical medium which transmits together the signal light from the input port and the pulsed pump light from the pump light generator, the nonlinear optical medium having a gain of the signal light based on a nonlinear optical effect;
- and
- a power adjustor which adjusts a relative power of the signal light power and the pulsed pump light power so that the gain of the signal light in the nonlinear optical medium decreases with an increase of the signal light power.
2 more elements
An optical communication system comprising:
- a transmitter which transmits a signal light to a transmission line;
- a repeater, arranged along the transmission line, which receives the signal light from the transmission line, repeats the received signal light, and then transmits the repeated signal light, the repeater comprising:
- an input port which inputs the signal light having a modulating frequency and a signal light power;
- a pump light generator which generates a pulsed pump light having a pulsed pump light power and a frequency that is 1.5 times higher, or more, than the modulating frequency of the signal light;
- a nonlinear optical medium which transmits together the signal light from the input port and the pulsed pump light from the pump light generator, the nonlinear optical medium having a gain of the signal light based on a nonlinear optical effect;
- and
- a power adjustor which adjusts a relative power of the signal light power and the pulsed pump light power so that the gain of the signal light in the nonlinear optical medium decreases with an increase of the signal light power;
- and
- a receiver which receives the repeated signal light from the transmission line.
6 more elements
An apparatus for controlling optical waveform, comprising:
- input means for inputting a signal light having a modulating frequency and a signal light power;
- generation means for generating pulsed pump light having a pulsed pump light power and a frequency that is 1.5 times higher, or more, than the modulating frequency of the signal light;
- nonlinear light means for transmitting together the signal light from the input means and the pulsed pump light from the generation means, the nonlinear light means having a gain of the signal light based on a nonlinear optical effect;
- and
- power adjustment means for adjusting a relative power of the signal light power and the pulsed pump light power so that the gain of the signal light in the nonlinear light means decreases with an increase of the signal light power.
2 more elements
An apparatus for controlling optical waveform, comprising:
- an input port which inputs a signal light having a modulating frequency and a signal light power;
- a pump light generator which generates a pulsed pump light having a pulsed pump light power and a frequency higher than the modulating frequency of the signal light;
- a nonlinear optical medium which transmits together the signal light from the input port and the pulsed pump light from the pump light generator, the nonlinear optical medium having a gain of the signal light based on a nonlinear optical effect;
- and
- a power adjustor which adjusts at least one of the group consisting of the signal light power and the pulsed pump light power in order to saturate the gain of the signal light in the nonlinear optical medium, wherein
- the signal light has a signal light polarization state, and the pulsed pump light has a pulsed pump light polarization state, and
- the apparatus further comprising:
- a polarization adjustor which adjusts at least one of the group consisting of the signal light polarization state and the pulsed pump light polarization state so that the signal light polarization state is in a different polarization state from the pulsed pump light polarization state, and
- a polarizer which cuts off the signal light outputted from the nonlinear optical medium.
6 more elements
An apparatus comprising:
- an input port which inputs a signal light having a modulating frequency and a signal light power;
- a pump light generator which generates pulsed pump light having a pulsed pump light power and a frequency higher than the modulating frequency of the signal light;
- a nonlinear optical medium which transmits together the signal light from the input port and the pulsed pump light from the pump light generator, the nonlinear optical medium having a gain of the signal light based on a nonlinear optical effect;
- and
- a power adjustor which adjusts a relative power of the signal light power and the pulsed pump light power so that the gain of the signal light in the nonlinear optical medium decreases with an increase of the signal light power,
- wherein the frequency of the pulsed pump light is sufficiently higher than the modulating frequency of the signal light so that the signal light and pulsed pump light synchronize with each other without adjusting output timing of the pulsed pump light in conformance with that of the signal light.
3 more elements
Dependencies are inferred from the claim text.