Fibre-type light wavelength coversion device

Details Fibre-type light wavelength coversion device Fibre-type light wavelength coversion device

1989-05-22

1991-01-01

Lee, John D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

350 9615, 350 9633, 307425, 307430, G02B 622, G02F 135

Patent

active

049813374

ABSTRACT:
A fibre-type light wavelength conversion device for converting the wavelength of an incident light beam and issuing the incident light beam as a light beam having a predetermined wavelength, having a core and a cladding layer around the core. The device is characterized by the provision of a transparent cylindrical layer provided around the cladding layer, having a refractive index substantially equal to the refractive index of the cladding layer and having a predetermined wall thickness. According to a feature of the invention the wall thickness is determined so that the condition d>l tan .theta. is satisfied, where d represents a diameter of said cylindrical layer, l represents an operating length of the device, and .theta. represents Cerenkov angle.

REFERENCES:
patent: 4830447 (1989-05-01), Kamiyama et al.
patent: 4838638 (1989-06-01), Kamiyama et al.
patent: 4874221 (1989-10-01), Ohsawa
patent: 4892375 (1990-01-01), Chikuma et al.
patent: 4893888 (1990-01-01), Okazaki et al.

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