OPTICAL WAVELENGTH DIVISION MULTIPLEX TRANSMITTER - Nippon Telegraph and Telephone Corporation

Title:

OPTICAL WAVELENGTH DIVISION MULTIPLEX TRANSMITTER

Document Type and Number:

Japanese Patent JP3430454

Kind Code:

B2

Abstract:

PROBLEM TO BE SOLVED: To minimize the deterioration in the transmission characteristic in 4-optical wave mixture by applying wavelength multiplex to an optical angular modulation signal with a plurality of wavelength bands so as to use a dispersive shift fiber.
SOLUTION: An optical angular modulation signal with a plurality of wavelength bands is sent through wavelength multiplex. In this case, the wavelength sets of light sources 11-1 to 11-n corresponding to each channel are arranged on an optical frequency axis at an unequal interval so that a 4-optical wave mixed light is not caused on any signal optical wavelength. Optical carriers outputted from the light sources 11-1 to 11-n are given to optical phase modulation circuits 12-1 to 12-n and subject to optical phase modulation by binary data signals d1-dn. In this case, optical PSK modulation or optical DPSK modulation is also available. Then the optical modulation signals with each wavelength outputted from the optical phase modulation circuits 12-1 to 12-n are combined into one optical fiber by an optical wavelength multiplexer means 13 such as an photocoupler and an array waveguide diffraction grating optical filter, amplified altogether by an optical booster amplifier 14 and the resulting signal is sent to an optical fiber transmission line 15.

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Inventors:

Kazushige Yonenaga
Shigeki Aizawa
Noboru Kochio
Masaru Iwashita

Application Number:

JP16759296A

Publication Date:

July 28, 2003

Filing Date:

June 27, 1996

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

H04J14/00; H04B10/2507; H04B10/2563; H04B10/548; H04B10/572; H04B10/588; H04J14/02; (IPC1-7): H04B10/02; H04B10/18; H04J14/00; H04J14/02

Domestic Patent References:

JP7264166A
JP818540A

Other References:

【文献】米永一茂他,光DPSK信号を用いた不等間隔波長配置WDM伝送系における四光波混合伝送劣化の抑圧,1996年電子情報通信学会通信ソサイエティ大会講演論文集2,日本,社団法人電子情報通信学会,1996年 8月30日,B-1109,p.594

Attorney, Agent or Firm:

Furuya Fumio

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