OPTICAL ATTENUATOR AND ITS PRODUCTION

Japanese Patent JP3142105

B2

PURPOSE: To obtain an inexpensive optical attenuator which is free from the fluctuation in a light attenuation quantity by axis misalignment and is easily producible by setting the outside diameter of the clad of an optical fiber at the same size as the outside diameter of the ferrule of an optical connector.
CONSTITUTION: This optical attenuator consists of a core 11 and the clad 12 in common use as the ferrule having the same outside diameter as the outside diameter of the conventional zirconia ferrule having a refractive index difference from the core 11 and is provided with a filter 13 for optical attenuation within a groove 14 so as to shut off the core 11. The optical attenuator is produced by forming a preform similar to the product in the ratio of the outside diameter of the core to the outside diameter of the conventional product and drawing and stretching the preform in the same manner as for the general optical fibers. Then, the technique for precise molding of the optical fiber is applicable as it is and the drastic cost reduction is possible as the continuous production is possible. Since there is no combination of the ferrule made of, for example, the zirconium and the optical fiber like heretofore, the production is simplified and the factor for fluctuation of the light attenuation quantity decreases.

Yoshiaki Takeuchi
Kuniharu Kato
Ryo Nagase
Shinichi Iwano
Mamoru Hirayama

JP23266394A

March 07, 2001

September 28, 1994

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Nippon Telegraph and Telephone Corporation

G02B6/00; G02B6/26; G02B6/36; (IPC1-7): G02B6/00; G02B6/26; G02B6/36

JP6097304A
JP637803U
JP6396506U

Yasuyuki Tanaka (2 outside)

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