초록 ▼

Methods and apparati for spatially encoding and decoding spread spectrum communication signals using broad band light sources are disclosed. The encoding algorithms involve the use of orthogonal spatial wavelets, which are preferably discrete attenuation functions of light from different sources so

Methods and apparati for spatially encoding and decoding spread spectrum communication signals using broad band light sources are disclosed. The encoding algorithms involve the use of orthogonal spatial wavelets, which are preferably discrete attenuation functions of light from different sources so that the discrete attenuation function is imposed upon the spectrum of the light source. The function may be used either merely for providing an encoded channel or by providing a second mask that may be, for example, the complement of the discrete attenuation function so that the light beam is discrete with the first attenuation function.

대표청구항 ▼

[ I claim:] [1.] A method of recovering data a spatially encoded light signal, the light signal spatially encoded according to a first binary code of length L, the light signal transmitted over and recovered from an optical fiber having a plurality of such spatially encoded light signals, the method

[ I claim:] [1.] A method of recovering data a spatially encoded light signal, the light signal spatially encoded according to a first binary code of length L, the light signal transmitted over and recovered from an optical fiber having a plurality of such spatially encoded light signals, the method comprising;diverting light from the optical fiber and separating the light into first and second portions;spatially spreading the spectrum of the first and second light portions;passing the first light portion through a first mask having L cells defining the first binary code of length L to provide a first filtered spectrum;passing the second light portion through a second mask having L cells and defining a bit-wise complement to the first binary code of length L to provide a second filtered spectrum; andproviding the first filtered spectrum and the second filtered spectrum to a differential detector and differentially detecting signals including the data.