Patent ID: 6282337
Filing Date: 2001-08-28
Classification: G02B

Abstract:
A fiber optic system, comprising:a light focusing device;an optical axis defined in part by the light focusing device;a fiber optic element operable to transmit a multiplexed light signal, the fiber optic element oriented to project light through the light focusing device;a diffraction grating having a diffraction order greater than one, the diffraction grating positioned in a Littrow configuration with respect to the light focusing device and the fiber optic element;the diffraction grating having a grating normal for calculating an angle of incidence and an angle of diffraction;a mounting angle defined as the angle between the grating normal and the optical axis;the diffraction grating oriented such that light approaching the diffraction grating generally along the optical axis and diffracting from the diffraction grating generally along the optical axis produces angles of incidence and diffraction which are approximately equal with each other and the mounting angle; andthe angle of incidence, the angle of diffraction and the mounting angle greater than fifty eight degrees when measured from the grating normal.