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311 results about "Raman amplifiers" patented technology

A Raman amplifier is an optical amplifier based on Raman gain, which results from the effect of stimulated Raman scattering.

Modular, high energy, widely-tunable ultrafast fiber source

A modular, compact and widely tunable laser system for the efficient generation of high peak and high average power ultrashort pulses. Modularity is ensured by the implementation of interchangeable amplifier components. System compactness is ensured by employing efficient fiber amplifiers, directly or indirectly pumped by diode lasers. Peak power handling capability of the fiber amplifiers is expanded by using optimized pulse shapes, as well as dispersively broadened pulses. Dispersive broadening is introduced by dispersive pulse stretching in the presence of self-phase modulation and gain, resulting in the formation of high-power parabolic pulses. In addition, dispersive broadening is also introduced by simple fiber delay lines or chirped fiber gratings, resulting in a further increase of the energy handling ability of the fiber amplifiers. The phase of the pulses in the dispersive delay line is controlled to quartic order by the use of fibers with varying amounts of waveguide dispersion or by controlling the chirp of the fiber gratings. After amplification, the dispersively stretched pulses can be re-compressed to nearly their bandwidth limit by the implementation of another set of dispersive delay lines. To ensure a wide tunability of the whole system, Raman-shifting of the compact sources of ultrashort pulses in conjunction with frequency-conversion in nonlinear optical crystals can be implemented, or an Anti-Stokes fiber in conjunction with fiber amplifiers and Raman-shifters are used. A particularly compact implementation of the whole system uses fiber oscillators in conjunction with fiber amplifiers. Additionally, long, distributed, positive dispersion optical amplifiers are used to improve transmission characteristics of an optical communication system. Finally, an optical communication system utilizes a Raman amplifier fiber pumped by a train of Raman-shifted, wavelength-tunable pump pulses, to thereby amplify an optical signal which counterpropogates within the Raman amplifier fiber with respect to the pump pulses.
Owner:IMRA AMERICA

Raman amplifier, raman amplifier control method, and optical communication system

The present invention provides a Raman amplifier and the like comprising a structure for keeping the flatness of power spectrum of Raman-amplified signal light. The Raman amplifier comprises an optical fiber for Raman-amplifying a plurality of signal channels of signal light having respective center optical frequencies different from each other; a pumping light supply section for supplying N (N being an integer of 2 or more) pumping channels of pumping light having respective center optical frequencies different from each other to the optical fiber; and a feedback section for detecting a part of the signal light Raman-amplified within the optical fiber when the pumping light is supplied thereto, and controlling the pumping light supply section such that the Raman-amplified signal light has a substantially flat power spectrum with respect to an optical frequency direction according to the result of detection. In particular, the feedback section divides the detected Raman-amplified signal light into N optical frequency ranges defined so as to include respective Raman amplification peaks as optical frequencies lower than respective center optical frequencies of the pumping channels of pumping light by an optical frequency shift of about 15 THz, and controls the pumping light supply section such that the Raman-amplified signal light has a power fluctuation of 2 dB or less in each of thus divided N optical frequency ranges.
Owner:SUMITOMO ELECTRIC IND LTD

Online matt Raman amplifier with automatic shutdown and starting and control method thereof

The invention relates to an online matt Raman amplifier with automatic shutdown and starting and a control method thereof. An output end of a pump laser unit group is connected with a pump end of a combiner, a public end of the combiner is connected with a transmission optical fiber, a signal end of the combiner is connected with an input end of a spectro-coupler, the big end of the spectro-coupler is a signal output end, the small end of the spectro-coupler is connected with the public end of a signal band-pass filter, a reflection end of the signal band-pass filter is connected with a detector of noise outside bandwidth, a transmission end is connected with a detector of signal plus the noise within the bandwidth, the signal output ends of the detector of the noise outside the bandwidth and the detector of the signal plus the noise within the bandwidth are respectively connected with a signal input end of a control unit, and the signal output end of the control unit is connected with the pump laser unit group. The method is to realize the signal power detection and the ASE compensation according to the method of detecting the ASE power of the Raman amplifier outside the working bandwidth and the total power of the ASE within the working bandwidth and the signal. The method can accurately detect the actual power of the signal and automatically shut down and start the amplifier according to the level of the signal power.
Owner:GUANGXUN SCI & TECH WUHAN
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