Multimode optical transmission device
View Patent ↗An optical transmitting circuit ( 2 ) modulates multimode oscillation light using an information signal, subjects at least one oscillation-mode light beam of the multimode oscillation light to a predetermined operation, and outputting the result to an optical transmission channel. An optical receiving circuit ( 8 ) receives an optical signal transmitted through the optical transmission channel, subjects 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.
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:
a multimode light source for outputting multimode oscillating light;
an optical information modulating section for modulating the light output from the multimode light source using an information signal, and outputting the modulated optical signal; and
a mode encoding section for receiving the optical signal output from the optical information modulating section, subjecting a plurality of oscillation-mode light beams of the received optical signal to a first operation corresponding to the predetermined code, wherein the first operation is an operation of providing a predetermined amount of polarization change corresponding to the predetermined code to each of a plurality of oscillation-mode light beams of an input optical signal, and outputting the result to the optical transmission channel, and
the optical receiving circuit includes:
a mode decoding section for receiving an optical signal transmitted through the optical transmission channel, subjecting a plurality of oscillation-mode light beams of the received optical signal to a second operation having a reverse relationship with the first operation corresponding to the predetermined code, wherein the second operation is an operation of providing a polarization change having a polarity reverse to the predetermined amount of polarization change corresponding to the predetermined code, to each of a plurality of oscillation-mode light beams of an input optical signal, and outputting the result; and
an optical intensity detecting section for detecting a change in total optical intensity of an optical signal output from the mode decoding section, and converting the optical signal into an electrical signal, to reproduce the information signal.
2. 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:
a multimode light source for outputting multimode oscillating light;
an optical information modulating section for modulating the light output from the multimode light source using an information signal, and outputting the modulated optical signal; and
a mode encoding section for receiving the optical signal output from the optical information modulating section, subjecting a plurality of oscillation-mode light beams of the received optical signal to a first operation corresponding to the predetermined code, wherein the first operation is an operation of providing a predetermined amount of frequency change corresponding to the predetermined code to each of a plurality of oscillation-mode light beams of an input optical signal, and outputting the result to the optical transmission channel, and
the optical receiving circuit includes:
a mode decoding section for receiving an optical signal transmitted through the optical transmission channel, subjecting a plurality of oscillation-mode light beams of the received optical signal to a second operation having a reverse relationship with the first operation corresponding to the predetermined code, wherein the second operation is an operation of providing a frequency change having a polarity reverse to the predetermined amount of frequency change corresponding to the predetermined code, to each of a plurality of oscillation-mode light beams of an input optical signal, and outputting the result; and
an optical intensity detecting section for detecting a change in total optical intensity of an optical signal output from the mode decoding section, and converting the optical signal into an electrical signal, to reproduce the information signal.