OPTICAL ATTENUATOR Russian patent published in 2006 - IPC G02B6/10 

FIELD: optical engineering.

SUBSTANCE: optical attenuator can be used for attenuation of optical signals in optical communications, for optical measurements et cetera. Optical attenuator has dope which is capable of attenuating of transmitted light at higher degree when wavelength is longer than wavelength in single-mode optical fiber. Area of dope is limited in central part of core where refractivity is increased in relation to refractivity of peripheral part of core. The dope can be also limited in the direction to central part of core and refractivity in central part of core is increased in relation to peripheral part. Optical attenuator has dope which attenuates transmitted light at higher degree when wavelength of light is shorter in single-mode optical fiber. Area of dope is restricted in the direction of central part of core and refractivity in central part of core is increased in relation to refractivity of peripheral part. Area of dope can be also restricted in the direction of central part of core where refractivity is higher than refractivity of peripheral part of core. Optical attenuator equalizes optical attenuation of optical signals with wavelengths being close to each other. Difference in optical attenuation of optical signals can be maximized which signals have different wavelength at the condition when any characteristic of optical fiber is stable. Area of adoption is realized when its concentration is kept to relatively low level.

EFFECT: improved efficiency; improved reliability of operation.

9 cl, 7 dwg