Patent ID: 6031950
Filing Date: 2000-02-29
Classification: G02B,G02F

Abstract:
A wavelength-selective optical device, comprising:an optical fiber which includes a grating portion;a light input portion where light is supplied to said optical fiber;a light output portion where light with a specific wavelength to be output from said optical fiber is taken out;means for applying a stress to said grating portion;means for controlling said stress applied to said grating portion by said stress applying means to change a wavelength of light reflected by said grating portion in order to select light with said specific wavelength; andan optical coupling means including a first light input and output end connected with said light input portion, and a second light input and output end from which reflected light from said grating portion is taken out, said optical coupling means being an optical circulator which includes said first and second light input and output ends and a third light input and output end, wherein light input to said third light input and output end is output from said first light input and output end and light input to said first light input and output end is output from said second light input and output end,wherein said stress applying means is a piezoelectric element fixed to ends of said grating portion.