US 2002/0001113 A1Published application

Multiplex transmission apparatus

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorMasaru Fuse

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Abstract

An multiplex transmission apparatus that realizes a receiving system using a phased array antenna with high efficiency and low cost is provided. A delay controller 102 gives a time delay to a local oscillation signal outputted from a signal source 101. First and second optical transmitters 1031 and 1032 each converts the local oscillation signal and the delayed local oscillation signal into optical signals. A first optical multiplexer 104 multiplexes the optical signals for transmission. An optical separator 106 separates the multiplexed optical signal. A first multiplexer 1071 multiplexes first and second main element signals, while a second multiplexer 1072 multiplexes first and second sub-element signals. First and second optical modulators 1081 and 1082 each modulates the optical signal with multiplexed electrical signal group. A second optical multiplexer 109 multiplexes the modulated optical signals for transmission. An optical receiver 110 carries out square-low detection on the multiplexed optical signal. Then, from the optical receiver 110, the first or second main element (or sub-element) signal is obtained with its frequency converted.

Claims33

Dependent claims

A multiplex transmission apparatus that converts a plurality of signals varied in phase into an optical signal and, after transmission, extracts a desired signal therefrom, comprising,:

a signal source for outputting a main local oscillation signal having a predetermined frequency fx;
a first delay controller for giving a predetermined time delay τx to said main local oscillation signal outputted from said signal source and outputting said main local oscillation signal as a first sub-local oscillation signal;
a first optical transmitter for converting said main local oscillation signal outputted from said signal source into a first optical signal having a wavelength λ1;
second optical transmitter for converting said first sub-local oscillation signal outputted from said first delay controller into a second optical signal having a wavelength λ2;
a first optical multiplexer for multiplexing said first optical signal outputted from said first optical transmitter and said second optical signal outputted from said second optical transmitter;
a first optical transmission path for transmitting an optical signal outputted from said first optical multiplexer;
an optical separator for separating, for each wavelength, the optical signal transmitted through said first optical transmission path and outputting said first and second optical signals;
a first multiplexer for multiplexing a first main element signal having a predetermined frequency fa and a second main element signal having a predetermined frequency fb, and outputting a multiplexed signal as a main signal group;
a second multiplexer for multiplexing a first sub-element signal obtained by giving a predetermined time delay τa to said first main element signal and a second sub-element signal obtained by giving a predetermined time delay τb to said second main element signal, and outputting a multiplexed signal as a first sub-signal group;
a first optical modulator for modulating said first optical signal outputted from said optical separator with said main signal group outputted from said first multiplexer;
a second optical modulator for modulating said second optical signal outputted from said optical separator with said first sub-signal group outputted from said second multiplexer;
a second optical multiplexer for multiplexing said first optical signal outputted from said first optical modulator and said second optical signal outputted from said second optical modulator;
a second optical transmission path for transmitting an optical signal outputted from said second optical multiplexer;
and
an optical receiver for carrying out square-law detection on the optical signal transmitted through said second optical transmission path, and outputting a signal that uniquely corresponds to either one of said first main and sub-element signals and said second main and sub-element signals.

12 more elements

A multiplex transmission apparatus that converts a plurality of signals varied in phase into an optical signal and, after transmission, simultaneously extracts a plurality of desired signals therefrom, comprising:

a first signal source for outputting a first main local oscillation signal having a predetermined frequency fx;
a second signal source for outputting a second main local oscillation signal having a predetermined frequency fy;
a first delay controller for giving a predetermined time delay τx to said first main local oscillation signal outputted from said first signal source and outputting said first main local oscillation signal as a first sub-local oscillation signal;
a second delay controller for giving a predetermined time delay τy to said second main local oscillation signal outputted from said second signal source and outputting said second main local oscillation signal as a second sub-local oscillation signal;
a third multiplexer for multiplexing said first main local oscillation signal outputted from said first signal source and said second main local oscillation signal outputted from said second signal source, and outputting a multiplexed signal as a main local oscillation signal group;
a fourth multiplexer for multiplexing said first sub-local oscillation signal outputted from said first delay controller and said second sub-local oscillation signal outputted from said second delay controller, and outputting a multiplexed signal as a sub-local oscillation signal group;
a first optical transmitter for converting said main local oscillation signal group outputted from said third multiplexer into a first optical signal having a wavelength λ1;
a second optical transmitter for converting said first sub-local oscillation signal group outputted from said fourth multiplexer into a second optical signal having a wavelength λ2;
a first optical multiplexer for multiplexing said first optical signal outputted from said first optical transmitter and said second optical signal outputted from said second optical transmitter;
a first optical transmission path for transmitting an optical signal outputted from said first optical multiplexer;
an optical separator for separating, for each wavelength, the optical signal transmitted through said first optical transmission path and outputting said first and second optical signals;
a first multiplexer for multiplexing a first main element signal having a predetermined frequency fa and a second main element signal having a predetermined frequency fb, and outputting a multiplexed signal as a main signal group;
a second multiplexer for multiplexing a first sub-element signal obtained by giving a predetermined time delay τa to said first main element signal and a second sub-element signal obtained by giving a predetermined time delay τb to said second main element signal, and outputting a multiplexed signal as a first sub-signal group;
a first optical modulator for modulating said first optical signal outputted from said optical separator with said main signal group outputted from said first multiplexer;
a second optical modulator for modulating said second optical signal outputted from said optical separator with said first sub-signal group outputted from said second multiplexer;
a second optical multiplexer for multiplexing said first optical signal outputted from said first optical modulator and said second optical signal outputted from said second optical modulator;
a second optical transmission path for transmitting an optical signal outputted from said second optical multiplexer;
an optical receiver for carrying out square-law detection on the optical signal transmitted through said second optical transmission path, and outputting signals that uniquely correspond to said first main and sub-element signals and said second main and sub-element signals;
and
a filter for separating the signal outputted from said optical receiver by passing signal components uniquely corresponding to said first main and sub-element signals and signal components uniquely corresponding to said second main and sub-element signals for output.

17 more elements

A multiplex transmission apparatus that converts a plurality of signals varied in phase into an optical signal and, after transmission, extracts a desired signal therefrom, comprising:

signal source for outputting a main local oscillation signal having a predetermined frequency fx;
a first delay controller for giving a predetermined time delay τx to said main local oscillation signal outputted from said signal source and outputting said main local oscillation signal as a first sub-local oscillation signal;
a first optical transmitter for converting said main local oscillation signal outputted from said signal source into a first optical signal having a wavelength λ1;
a second optical transmitter for converting said first sub-local oscillation signal outputted from said first delay controller into a second optical signal having a wavelength λ2;
a first optical multiplexer for multiplexing said first optical signal outputted from said first optical transmitter and said second optical signal outputted from said second optical transmitter;
a first optical multiplexer/demultiplexer, capable of passing an optical signal received at a first terminal thereof for output from a second terminal thereof, passing an optical signal received at said second terminal thereof for output from a third terminal thereof, for passing an optical signal outputted from said first optical multiplexer coupled to said first terminal for output from said second terminal thereof;
an optical transmission path coupled to said second terminal of said first optical multiplexer/demultiplexer for bi-directionally transmitting optical signals;
a second optical multiplexer/demultiplexer, capable of separating an optical signal received at a fourth terminal thereof for each wavelength for output from fifth and sixth terminals thereof and multiplexing optical signals received at said fifth and sixth terminals for output from said fourth terminal, for receiving the optical signal outputted from said second terminal of said first optical multiplexer/demultiplexer at said fourth terminal through said optical transmission path coupled thereto, separating the optical signal for each wavelength, and outputting said first optical signal from the fifth terminal and said second optical signal from the sixth terminal;
a first multiplexer for multiplexing a first main element signal having a predetermined frequency fa and a second main element signal having a predetermined frequency fb, and outputting a multiplexed signal as a main signal group;
a second multiplexer for multiplexing a first sub-element signal obtained by giving a predetermined time delay τa to said first main element signal and a second sub-element signal obtained by giving a predetermined time delay τb to said second main element signal, and outputting a multiplexed signal as a first sub-signal group;
a first optical modulator for modulating said first optical signal outputted from said fifth terminal of said second optical multiplexer/demultiplexer with said main signal group outputted from said first multiplexer, and reflecting a modulated signal for output to said fifth terminal of said second optical multiplexer/demultiplexer;
a second optical modulator for modulating said second optical signal outputted from said sixth terminal of said second optical multiplexer/demultiplexer with said first sub-signal group outputted from said second multiplexer, and reflecting a modulated signal for output to said sixth terminal of said second optical multiplexer/demultiplexer;
and
an optical receiver for carrying out square-law detection on the optical signal outputted from said third terminal of said optical multiplexer/demultiplexer, and outputting a signal that uniquely corresponds to either one of said first main and sub-element signals and said second main and sub-element signals.

11 more elements

A multiplex transmission apparatus that converts a plurality of signals varied in phase into an optical signal and, after transmission, extracts a desired signal therefrom, comprising:

a first multiplexer for multiplexing a first main element signal having a predetermined frequency fa and a second main element signal having a predetermined frequency fb, and outputting a multiplexed signal as a main signal group;
a second multiplexer for multiplexing a first sub-element signal obtained by giving a predetermined time delay τa to said first main element signal and a second sub-element signal obtained by giving a predetermined time delay τb to said second main element signal, and outputting a multiplexed signal as a first sub-signal group;
a first optical transmitter for converting said main signal group outputted from said first multiplexer into a first optical signal having a wavelength λ1;
a second optical transmitter for converting said sub-signal group outputted from said second multiplexer into a second optical signal having a wavelength λ2;
a first optical multiplexer for multiplexing said first optical signal outputted from said first optical transmitter and said second optical signal outputted from said second optical transmitter;
an optical transmission path for transmitting an optical signal outputted from said first optical multiplexer;
an optical separator for separating the optical signal transmitted through said optical transmission path for each wavelength, and outputting said first and second optical signals;
a signal source for outputting a main local oscillation signal having a predetermined frequency fx;
a first delay controller for giving a predetermined time delay τx to said main local oscillation signal outputted from said signal source and outputting said main local oscillation signal as a first sub-local oscillation signal;
a first optical modulator for modulating said first optical signal outputted from said optical separator with said main local oscillation signal outputted from said signal source;
a second optical modulator for modulating said second optical signal outputted from said optical separator with said first sub-local oscillation signal outputted from said first delay controller;
a second optical multiplexer for multiplexing said first optical signal outputted from said first optical modulator and said second optical signal outputted from said second optical modulator;
and
an optical receiver for carrying out square-law detection on an optical signal outputted from said second optical multiplexer, and outputting a signal that uniquely corresponds to either one of said first main and sub-element signals and said second main and sub-element signals.

11 more elements

A multiplex transmission apparatus that converts a plurality of signals varied in phase into an optical signal and, after transmission, extracts a desired signal therefrom, comprising:

a first multiplexer for multiplexing a first main element signal having a predetermined frequency fa and a second main element signal having a predetermined frequency fb, and outputting a multiplexed signal as a main signal group;
a second multiplexer for multiplexing a first sub-element signal obtained by giving a predetermined time delay τa to said first main element signal and a second sub-element signal obtained by giving a predetermined time delay τb to said second main element signal, and outputting a multiplexed signal as a first sub-signal group;
a first optical transmitter for converting said main signal group outputted from said first multiplexer into a first optical signal having a wavelength λ1;
a second optical transmitter for converting said first sub-signal group outputted from said second multiplexer into a second optical signal having a wavelength λ2;
a first optical multiplexer for multiplexing said first optical signal outputted from said first optical transmitter and said second optical signal outputted from said second optical transmitter;
an optical transmission path for transmitting an optical signal outputted from said first optical multiplexer;
an optical separator for separating the optical signal transmitted through said optical transmission path for each wavelength, and outputting said first and second optical signals;
a first signal source for outputting a first main local oscillation signal having a predetermined frequency fx;
a second signal source for outputting a second main local oscillation signal having a predetermined frequency fy;
a first delay controller for giving a predetermined time delay τx to said first main local oscillation signal outputted from said first signal source and outputting said first main local oscillation signal as a first sub-local oscillation signal;
a second delay controller for giving a predetermined time delay τy to said second main local oscillation signal outputted from said second signal source and outputting said second main local oscillation signal as a second sub-local oscillation signal;
a third multiplexer for multiplexing said first main local oscillation signal outputted from said first signal source and said second main local oscillation signal outputted from said second signal source, and outputting a multiplexed signal as a main local oscillation signal group;
a fourth multiplexer for multiplexing said first sub-local oscillation signal outputted from said first delay controller and said second sub-local oscillation signal outputted from said second delay controller, and outputting a multiplexed signal as a first sub-local oscillation signal group;
a first optical modulator for modulating said first optical signal outputted from said optical separator with said main local oscillation signal group outputted from said third multiplexer;
a second optical modulator for modulating said second optical signal outputted from said optical separator with said first sub-local oscillation signal group outputted from said fourth multiplexer;
a second optical multiplexer for multiplexing said first optical signal outputted from said first optical modulator and said second optical signal outputted from said second optical modulator;
an optical receiver for carrying out square-law detection on an optical signal outputted from said second optical multiplexer, and outputting a signal that uniquely corresponds to said first main and sub-element signals and said second main and sub-element signals;
and
a filter for separating the signal outputted from said optical receiver by passing signal components uniquely corresponding to said first main and sub-element signals and signal components uniquely corresponding to said second main and sub-element signals for output.

16 more elements

Dependencies are inferred from the claim text.