Title:
OPTICAL PHASE DIFFERENCE/OPTICAL CARRIER WAVE FREQUENCY DIFFERENCE COMPENSATION DEVICE AND OPTICAL PHASE DIFFERENCE/OPTICAL CARRIER WAVE FREQUENCY DIFFERENCE COMPENSATION METHOD
Document Type and Number:
WIPO Patent Application WO/2013/136716
Kind Code:
A1
Abstract:
In a multicarrier optical communications system adopting both an optical phase modulation method and a multicarrier transmission method, device configuration becomes complicated and power consumption increases. Therefore, this optical phase difference/optical carrier wave frequency difference compensation device has: a separation unit; a first optical carrier wave frequency difference compensation unit; a second optical carrier wave frequency difference compensation unit; and an optical subcarrier wave frequency interval compensation unit that connects to the first optical carrier wave frequency difference compensation unit and the second optical carrier wave frequency difference compensation unit. The separation unit receives frequency division multiplexed signals obtained by mixing frequency division multiplexed signal light with local light and performing coherent detection, said frequency division multiplexed signal light modulating and multiplexing each of a plurality of optical subcarrier waves, which have different frequencies and include at least a first optical subcarrier wave and a second optical subcarrier wave; and outputs at least a first auxiliary carrier wave signal and a second subcarrier wave signal. The first optical carrier wave frequency difference compensation unit inputs the first subcarrier wave signal and comprises: an optical phase difference detection unit that detects the amount of optical phase variation, being the amount of variation in the optical phase difference between adjacent modulation signals in the first subcarrier wave signal; and a first compensation unit that compensates the optical carrier wave frequency difference in the first subcarrier wave signal, using first optical phase difference information on the basis of the amount of optical phase variation. The optical subcarrier wave frequency interval compensation unit calculates a frequency interval compensation amount that compensates the optical subcarrier wave frequency interval being the frequency difference between the first optical subcarrier wave and the second optical subcarrier wave. The second optical carrier wave frequency difference compensation unit inputs the second subcarrier wave signal and comprises a second compensation unit that compensates the optical carrier wave frequency difference in the second subcarrier wave signal, using second optical phase difference information calculated from the frequency interval compensation amount and the first optical phase difference information.
Inventors:
FUJISAWA SHINSUKE (JP)
OGASAHARA DAISAKU (JP)
FUKUCHI KIYOSHI (JP)
OGASAHARA DAISAKU (JP)
FUKUCHI KIYOSHI (JP)
Application Number:
PCT/JP2013/001362
Publication Date:
September 19, 2013
Filing Date:
March 05, 2013
Export Citation:
Assignee:
NEC CORP (JP)
FUJISAWA SHINSUKE (JP)
OGASAHARA DAISAKU (JP)
FUKUCHI KIYOSHI (JP)
FUJISAWA SHINSUKE (JP)
OGASAHARA DAISAKU (JP)
FUKUCHI KIYOSHI (JP)
International Classes:
H04B10/61; H04B10/556; H04J11/00; H04L27/227; H04L27/38
Domestic Patent References:
| WO2011099589A1 | 2011-08-18 | |||
| WO2012132103A1 | 2012-10-04 |
Foreign References:
| JP2002511711A | 2002-04-16 | |||
| JP2004364157A | 2004-12-24 |
Other References:
WAKAKO MAEDA ET AL.: "Hardware-efficient polarization demultiplexing for QAM signals based on dual stage decision-directed algorithm, Optical Fiber Communication Conference and Exposition (OFC/NFOEC)", 2012 AND THE NATIONAL FIBER OPTIC ENGINEERS CONFERENCE, 4 March 2012 (2012-03-04), pages 1 - 3
Attorney, Agent or Firm:
SHIMOSAKA, NAOKI (JP)
Naoki Shimosaka (JP)
Naoki Shimosaka (JP)
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