Patent
Light amplification control unit and method
Tanaka Tomoto,Tamura Yuji +1 more
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TLDR
In this article, a light amplification control unit whereby the gain of an optical amplifier can be controlled with ease is presented. But it is not shown how to control the output of the external control beam from an external control light source.Abstract:
A light amplification control unit whereby the gain of an optical amplifier can be controlled with ease. A plurality of pump light sources each generate a pump beam having the effect of amplifying a signal beam, and an external control light source generates an external control beam having a wavelength that influences the signal beam amplification effect by means of the pump beams. A multiplexing section multiplexes the pump beams with the external control beam and causes the multiplexed beams to enter an optical fiber in a direction opposite to that of the signal beam. A control section controls the output of the external control beam from the external control light source, whereby the gain of the signal beam amplified by the pump light sources can be controlled.read more
Citations
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Patent
Raman amplifier and raman pumping method
TL;DR: In this paper, a light source unit outputs a pumping light having a wavelength that periodically changes, and a light intensity control unit varies the light intensity of the pumping light to improve the gain flatness of a Raman gain.
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TL;DR: In this paper, a plurality of pump light sources generate plural variations of pump lights having different frequencies, and a modulation circuit intensity-modulates the plural variations in predetermined periods, respectively.
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TL;DR: In this paper, the first and second wavelength-selective reflectors and the optical fiber are configured such that Raman scattering and gain in the transmission fiber converts pump radiation at a pump wavelength less than the first wavelength to radiation of the second wavelength.
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Hybrid fiber amplifier and method for adjusting gain and gain slope thereof
Fu Chengpeng,Cuihong Zhang,Xiong Tao,Menghui Le,Tao Jintao,Yu Zhenyu,Jing Yunyu,Bu Qinlian,Chunping Yu +8 more
TL;DR: In this paper, a hybrid fiber amplifier and a method of adjusting gain and gain slope of thereof is presented, which is applicable to technical field of optical communications, but it does not include variable optical attenuator.
References
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Patent
High order fiber Raman amplifiers
TL;DR: In this article, a Raman optical amplifier for amplifying an optical signal propagating in an optical fiber associated with an optical communications system is presented, where the first and second order Raman pump light are introduced into the fiber in either a co-propagating or counterpropagation direction relative to the propagation direction of the optical signal in the fiber.
Patent
Wdm optical communication system using co-propagating raman amplification
TL;DR: In this article, the use of a co-propagating fiber Raman amplifier in an optical WDM transmission system has been found to be practical in the situation where the fiber amplifier is operated into depletion and the characteristics of the input signals are controlled to exhibit a reduced integrated relative intensity noise (RIN) over the fiber crosstalk bandwidth.
Patent
Tunable multimode wavelength division multiplex Raman pump and amplifier, and a system, method, and computer program product for controlling tunable Raman pumps, and Raman amplifiers
TL;DR: In this article, a tunable multimode wavelength division multiplex Raman pump and amplifier is presented, and a system, method, and computer program product for controlling the tunability of the pump source is presented.
Patent
Wide bandwidth fiber raman amplifier
TL;DR: In this article, a method of Raman amplification comprising the step of effecting a plurality of pump wavelengths on a Raman-active transmission medium transmitting counter-propagating signal wavelengths, wherein at least one of said pump wavelengths are interleaved between said signal wavelengths.
Patent
Single-source multiple-order raman amplifier for optical transmission systems
TL;DR: In this paper, an optical fiber communication system with one or more single source, multiple-order Raman pump light for amplifying the signal channels is described. But the authors did not consider the effect of the optical signal channel on the optical fiber transmission line.