Patent ID: 7917038
Filing Date: 2011-03-29
Classification: H04B,H04J

Abstract:
1. A multimode optical transmission device for transmitting a multimode optical signal modulated using an information signal to be transmitted, comprising: an optical transmitting circuit for modulating multimode oscillation light using the information signal, subjecting at least one oscillation-mode light beam of a plurality of oscillation-mode light beams of the modulated multimode oscillation light to a predetermined operation, and outputting the result to an optical transmission channel; and an optical receiving circuit for receiving an optical signal transmitted through the optical transmission channel, subjecting the received optical signal to an operation reverse to the predetermined operation to recover an optical signal as it was before being subjected to the predetermined operation, and converting the recovered optical signal into an electrical signal, thereby reproducing the information signal, wherein the predetermined operation changes a correlation relationship between the plurality of oscillation-mode light beams, the optical transmitting circuit subjects the plurality of oscillation-mode light beams of the multimode oscillation light to an operation corresponding to a predetermined code as the predetermined operation, and outputs the result to the optical transmission channel, the optical receiving circuit receives light transmitted through the optical transmission channel, subjects the plurality of oscillation-mode light beams of the received light to an operation reverse to the operation corresponding to the predetermined code to recover an optical signal as it was before being subjected to the predetermined operation, detects a change in total optical intensity of the plurality of oscillation-mode light beams, and converts the recovered optical signal into an electrical signal, thereby reproducing the information signal, the optical transmitting circuit includes: the optical receiving circuit includes: