Park, Vaughan, Fleming & Dowler LLP
Echelle grating with cyclic free-spectral range
An optical de-multiplexer (de-MUX) that includes an optical device that images and diffracts an optical signal using a reflective geometry is described, where a free spectral range (FSR) of the optical device associated with a given diffraction order abuts FSRs associated with adjacent diffraction orders. Moreover, the channel spacings within diffraction orders and between adjacent diffraction orders are equal to the predefined channel spacing associated with the optical signal. As a consequence, the optical device has a comb-filter output spectrum, which reduces a tuning energy of the optical device by eliminating spectral gaps between diffraction orders of the optical device.
Oracle International Corporation
G H G
G02B H04J G02B
inventional inventional additional
Ashok V. Ying Kannan Guoliang Xuezhe
Krishnamoorthy Luo Raj Li Zheng