Alcatel

Alcatel Lucent

Ekaterina Bourova

Christian Simonneau

Lionel Provost

Catherine Martinelli

Stéphanie Blanchandin

Florence Leplingard

Georg Bastian

Jérome Garapon

The amplifying optical fiber comprises a single-mode core and a multimode core surrounding the single-mode core, the multimode core containing a doped layer referred to as a 'doped ring' and having a certain concentration of active rare earth ions to perform amplification by active rare earth ions on at least one optical signal for injection into the amplifying fiber. The fiber is dimensioned so that the product of its length multiplied by its Raman efficiency is greater than or equal to 0.5 W. In addition, the fiber presents absorption defined by an absorption coefficient expressed in dB/m, which absorption presents, at a certain wavelength, a maximum value referred to as the 'absorption maximum', the fiber presents accumulated absorption, corresponding to the product of its length multiplied by the absorption maximum, that is greater than or equal to 100 dB. The invention also provides an amplifier including such a fiber, a single-mode pump, and a multimode pump.

Doped-ring amplifying optical fiber, and an amplifier containing such a fiber

A Raman amplification active optical fiber comprises a core containing silica oxide (SiO), lithium oxide (LiO), germanium oxide (GeO), and barium oxide (BaO). The core contains 30 to 90 molar percent of SiOand less than 50 molar percent of the combination of LiO, GeO, and BaO. Application of the fiber to a multiwavelength Raman fiber laser.

Active optical fiber for Raman amplification

The amplifying optical fiber () comprises a single-mode core () and a multimode core () surrounding the single-mode core, the multimode core containing a doped layer referred to as a 'doped ring' () and having a certain concentration of active rare earth ions () to perform amplification by active rare earth ions on at least one optical signal for injection into the amplifying fiber. The fiber is dimensioned so that the product of its length multiplied by its Raman efficiency is greater than or equal to 0.5 W. In addition, the fiber presents absorption defined by an absorption coefficient expressed in dB/m, which absorption presents, at a certain wavelength, a maximum value referred to as the 'absorption maximum', the fiber presents accumulated absorption, corresponding to the product of its length multiplied by the absorption maximum, that is greater than or equal to 100 dB. The invention also provides an amplifier including such a fiber, a single-mode pump, and a multimode pump.

A Raman amplifier system, including an optical wave guide having a crystalline material for guiding an optical signal having a first wavelength, the crystalline material having a Raman wavelength shift, and a pump configured to pump light into the optical wave guide, the pump light having a second wavelength being substantially equal to the first wavelength minus the Raman wavelength shift.

Raman amplifier system

An optical fiber has a fiber core with a higher refractive index and a cladding surrounding the core with a lower refractive index. The fiber core is made of a multi-component oxide glass composition which consists of a glass-forming component and two Raman-active components. The glass former is SiOand the Raman active components are of LiO and NbO. The concentration of the glass former is between 30 and 90 mol % and of the Raman active components is up to 50 mol % in total. The composition may further include a glass-modifying component of alkaline such as LiO, NaO, KO, RbO, CsO or earth-alkaline such as BeO, MgO, CaO, SrO, BaO in a concentration of up to 40 mol %.

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Boulogne-Billancourt, France

Ekaterina Bourova