Patent ID: 6055345
Filing Date: 2000-04-25
Classification: G02B

Abstract:
A multi-wavelength channel transmission-type optical filter comprising:A first optical fiber coupler for dividing a broadband input light source into a first light signal and a second light signal;An optical fiber length for receiving the first light signal and an optical fiber length controlling unit for receiving the second light signal for controlling the gap of transmission wavelength, said optical fiber length and said controlling unit each having a first end connected to said first optical fiber coupler;A second optical fiber coupler connected to a second end of said fiber length and to said controlling unit for outputting said first and second light signals which are passed through the optical fiber length controlling unit and the optical fiber length, said second coupler having a pair of outputs; andAn optical isolator connected to said second coupler for narrowing the bandwidth of transmission wavelength, said isolator being connected across said pair of outputs of the second optical fiber coupler, thereby improving a wavelength selecting characteristics.