Photodetector array and optical communication monitor module using the same
AssigneeNippon Sheet Glass Co., Ltd.
InventorsYasunao Kuroda, Takashi Tagami, Kenichi Nakama
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Abstract
When a diffraction grating having a grating period of d and a diffraction order of m for an incident light having a wavelength interval Δλi between i'th and (i+1)'th channels is used, an optical path length between the diffraction grating and the photodetector is represented by L and a mean output angle is represented by θo, a pitch pi between the i'th and (i+1)'th photodetectors in the photodetector array satisfies the equation of pi=mΔλiL/d cos θo.
Claims4
An optical communication monitor module for dividing a wavelength multiplexed light having N channels (N is an integer of 3 or more) through a diffraction grating having a diffraction order of m and a grating period of d and for receiving the divided light through a photodetector array,
- wherein a pitch pi between i'th and (i+1)'th (i is an integer of 1 to (−1)) photodetectors in the photodetector array satisfies the following equation:
- pi=mΔλiL/d cos θo
- Δλi being a wavelength interval between i'th and (i+1)'th channels, L being an optical path length between the diffraction grating and the photodetector array, and θo being a mean output angle.
Dependencies are inferred from the claim text.