Optical transmission apparatus, optical reception apparatus, optical communication apparatus, optical communication system, and methods of controlling them

Patent metadata

Field	Value
Publication number	US-2016211920-A1
Application number	US-201314915216-A
Country	US
Kind code	A1
Filing date	Aug 30, 2013
Priority date	Aug 30, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

An optical transmission apparatus (1_1) according to the present invention includes a first transmission unit (11_1) that transmits a first optical transmission signal (21_1), a second transmission unit (11_2) that transmits a second optical transmission signal (21_2), and an output unit that outputs, when the first optical transmission signal (21_1) and the second optical transmission signal (21_2) share a set of information, both the first optical transmission signal (21_1) and the second optical transmission signal (21_2) to a first path (26_1) and outputs, when the first optical transmission signal (21_1) and the second optical transmission signal (21_2) do not share the set of information, one of the first optical transmission signal (21_1) and the second optical transmission signal (21_2) to a second path (26_2).

First claim

1 . An optical transmission apparatus comprising:
a first transmission unit that transmits a first optical transmission signal; a second transmission unit that transmits a second optical transmission signal; and an output unit that outputs, when the first optical transmission signal and the second optical transmission signal share a set of information, both the first optical transmission signal and the second optical transmission signal to one path and outputs, when the first optical transmission signal and the second optical transmission signal do not share the set of information, the first optical transmission signal and the second optical transmission signal to paths different from each other.

2 . The optical transmission apparatus according to claim 1 , wherein a predetermined parameter of a first sub-carrier used to generate the first optical transmission signal and a predetermined parameter of a second sub-carrier used to generate the second optical transmission signal are allocated in such a way that they do not overlap each other.

3 . The optical transmission apparatus according to claim 2 , wherein:
the predetermined parameter comprises a plurality of parameters, and the first sub-carrier and the second sub-carrier are arranged in such a way that they do not overlap each other on a matrix having the plurality of parameters as axes.

4 . The optical transmission apparatus according to claim 2 , wherein the predetermined parameter is at least one of a wavelength, a polarization, and a time.

5 . The optical transmission apparatus according to claim 1 , wherein the first and second transmission units generate the first and second optical transmission signals having wavelengths different from each other using light supplied from a light source.

6 . The optical transmission apparatus according to claim 5 , wherein:
the first transmission unit is supplied with a first sub-carrier from a first light source; and the second transmission unit is supplied with a second sub-carrier from a second light source.

7 . The optical transmission apparatus according to claim 5 , further comprising:
a single light source; and a sub-carrier generation unit that generates first and second sub-carriers using light generated in the single light source and supplies the first and second sub-carriers that have been generated to the first and second transmission units, respectively.

8 . The optical transmission apparatus according to claim 7 , wherein the sub-carrier generation unit modulates light generated in the single light source using orthogonal frequency division multiplexing to generate the first and second sub-carriers that are perpendicular to each other.

9 . The optical transmission apparatus according to claim 1 , wherein:
when the first and second transmission units transmit data in which a set of information is shared, data that has been serial-parallel converted is supplied to the first and second transmission units, the first and second transmission units transmit the data that has been serial-parallel converted in parallel, and the output unit outputs both the first and second optical transmission signals to the one path.

10 . The optical transmission apparatus according to claim 1 , wherein the output unit comprises:
a switch unit that switches output destinations of the first and second optical transmission signals output from the first and second transmission units; and first and second optical multiplexers that are provided to correspond to first and second paths and multiplex the first and second optical transmission signals output from the switch unit.

11 . The optical transmission apparatus according to claim 10 , wherein the switch unit comprises first and second optical switches that are provided to correspond to the first and second transmission units and switch output destinations of the first and second optical transmission signals output from the first and second transmission units to the first optical multiplexer or the second optical multiplexer.

12 . The optical transmission apparatus according to claim 1 , wherein the output unit comprises:
an optical multiplexer that multiplexes the first and second optical transmission signals output from the first and second transmission units; and an optical demultiplexer that selectively outputs the first and second optical transmission signals included in the multiplexed optical signal output from the optical multiplexer to first and second paths.

13 . An optical reception apparatus comprising:
first and second reception units that receive a sub-carrier reception signal; and a switch unit that outputs a first sub-carrier reception signal and a second sub-carrier reception signal that have been input to the first and second reception units, wherein: when the first and second sub-carrier reception signals share a set of information, the switch unit receives the first and second sub-carrier reception signals via one path and outputs the first sub-carrier reception signal to the first reception unit and the second sub-carrier reception signal to the second reception unit, and when the first sub-carrier reception signal and the second sub-carrier reception signal do not share the set of information, the switch unit receives the first and second sub-carrier reception signals via paths different from each other and outputs the first sub-carrier reception signal to the first reception unit and the second sub-carrier reception signal to the second reception unit.

14 . The optical reception apparatus according to claim 13 , further comprising a signal processing unit that processes a first reception signal output from the first reception unit and a second reception signal output from the second reception unit,
wherein the signal processing unit compensates for an influence of mutual interference between the first sub-carrier reception signal and the second sub-carrier reception signal.

15 . The optical reception apparatus according to claim 14 , wherein:
the first and second reception units respectively comprise first and second local oscillators, and the signal processing unit compensates for an influence of mutual interference between the first sub-carrier reception signal and the second sub-carrier reception signal by controlling the first and second local oscillators according to the first and second sub-carrier reception signals.

16 . The optical reception apparatus according to claim 13 , wherein:
each of the reception units is configured to be able to receive a plurality of sub-carrier reception signals, and each of the reception units makes local oscillation light generated by the local oscillator included in each of the reception units and the sub-carrier reception signals that have been input interfere with each other to selectively receive a predetermined sub-carrier reception signal from the plurality of sub-carrier reception signals that have been input.

17 . The optical reception apparatus according to claim 13 , wherein:
the plurality of reception units including the first reception unit share a first local oscillator, the plurality of reception units including the second reception unit share a second local oscillator, and the first and second local oscillators are controlled according to the sub-carrier reception signal.

18 . The optical reception apparatus according to claim 17 , wherein, when the plurality of reception units that comprise the first reception unit do not receive the sub-carrier reception signal, the first local oscillator is

Assignees

• Nec Corp

Inventors

• Aono Yoshiaki

Classifications

• H04J14/00 Primary

  Optical multiplex systems · CPC title

• H04B10/40

  Transceivers · CPC title

• H04B10/60

  Receivers · CPC title

• H04B10/50 Primary

  Transmitters · CPC title

• H04J14/0307

  Multiplexers; Demultiplexers · CPC title