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Raman laser with improved output power and lower sensitivity to the output coupler reflectivity

A technology of lasers and reflectors, applied in lasers, laser components, phonon exciters, etc., can solve the problems of reflector diversity attenuation, manufacturing difficulties, Bragg grating difficulties, etc.

Inactive Publication Date: 2007-07-18
ALCATEL LUCENT SAS
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Problems solved by technology

Raman lasers with so many reflectors are not only very difficult to fabricate since both parts of each pair of reflectors must have essentially the same central wavelength, but the unwanted attenuation due to the diversity of reflectors can be severe
For example, Stokes lines experience as much as 0.5dB of loss as radiation passes through each output reflector
and it is very difficult to obtain Bragg gratings with reflection coefficients as low as several ten percent

Method used

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  • Raman laser with improved output power and lower sensitivity to the output coupler reflectivity
  • Raman laser with improved output power and lower sensitivity to the output coupler reflectivity
  • Raman laser with improved output power and lower sensitivity to the output coupler reflectivity

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Embodiment Construction

[0019] Figure 2 shows a Raman laser 11 according to the invention. This Raman laser 11 includes an optical fiber serving as a Raman optical fiber 17 . The Raman fiber 17 has some reflectors (r i , r i ’) surrounded by. In this example, Fig. 2 depicts five reflectors 21, 22, ..., 25 at the input of a Raman laser 11, and five reflectors 20, 21', ..., 24' at its output. All these reflectors 20, 21, 21', ..., 24, 24', 25 preferably consist of some fiber Bragg gratings constructed on said optical fibre. However, other kinds of reflectors are also conceivable.

[0020] Raman laser 11 is coupled at its input to pump source 15 via coupler 16 . The pump source enters the Raman laser 11 at the wavelength λ PO will provide the initial pump radiation. An isolator 18 is placed at the output of the Raman laser 11 to prevent any radiation entering through its output from the outside. The output features a chamfered end interface 19, which serves to avoid another unwanted reflector. ...

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Abstract

It is proposed to use a Raman laser with a new optical resonant cavity for the Roman radiation lambdaRR. Such resonant cavity is made out of an unpaired reflector rRR with a reflecting wavelength corresponding to said Raman radiation lambdaRR. The second reflector at the output needed to build an optical resonant cavity is advantageously defined by Rayleigh scattering to take place at least at a portion of the optical fiber between the reflector rRR and the output of that Raman laser. With the use of the Rayleigh scattering as a complementary reflector to be associated with the unpaired reflector, it is then possible to obtain an optical resonant cavity for the Raman radiation lambdaRR with an output reflectivity of less than 1% i.e. with optimized Raman radiation. Such Raman laser is particularly appropriated to be used as a second order Raman laser.

Description

technical field [0001] The invention relates to a Raman laser for emitting Raman radiation and to a device for Raman amplification processing comprising such a Raman laser. Furthermore, the invention relates to a method for generating Raman radiation. Background technique [0002] Currently, fiber optic technology is used in communication systems to transmit information, such as voice and digital signals, as optical signals over long distances. However, over such long distances, the strength and quality of the transmitted optical signal gradually degrades. Therefore, techniques have been developed to regenerate or amplify optical signals as they travel along optical fibers. [0003] One known amplification technique exploits an effect known as Raman scattering to amplify an incoming information-bearing optical signal. Raman scattering describes the interaction between light and the vibrations of molecules in the material through which the light travels. The incident ligh...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/30H01S3/00
CPCH01S3/0675H01S3/0809H01S3/302
Inventor 弗洛朗斯·勒普兰加尔德索菲·博尔内
Owner ALCATEL LUCENT SAS
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