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Optical code division multiplex transmission method and optical code division multiplex transmission device

A technology of multiplexing and transmission methods, which is applied in the field of devices for realizing the method, and can solve problems such as not being disclosed

Inactive Publication Date: 2005-02-09
OKI ELECTRIC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Although OCDM, which uses SSFGB for encoders and decoders, is disclosed by P.Petropoulos, for example, there is no disclosure about the operating wavelength of SSFBG constituting the encoder at the transmitting end and the decoder at the receiving end. The method of adjusting the difference of the Bragg wavelength of the SSFBG is less than tens of pm (see Non-Patent Document 1)

Method used

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  • Optical code division multiplex transmission method and optical code division multiplex transmission device
  • Optical code division multiplex transmission method and optical code division multiplex transmission device
  • Optical code division multiplex transmission method and optical code division multiplex transmission device

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no. 1 Embodiment

[0088] see figure 2 The block structure diagram shown here combines and explains the structure of the optical code division multiplexing transmission method and the optical code division multiplexing transmission device as the first embodiment of the present invention and the functions of each part.

[0089] The optical code division multiplexing transmission device includes a transmission unit 10 and a reception unit 40 , which are respectively connected via transmission paths 42 . The signal transmitted by the optical code division multiplexing transmission device is an optical pulse signal, and the optical pulse signal is a binary digital electrical pulse signal that will carry the information to be transmitted (the signal is a "0" or "1" The value of the binary digital signal is reflected as a pulse signal of high and low voltage) and the signal obtained by photoelectric conversion.

[0090] The transmitting unit 10 includes an optical pulse train generator 12 , a...

no. 2 Embodiment

[0154] see Figure 8 The block structure diagram shown together explains the structure and the function of each part of the optical code division multiplexing transmission method and the optical code division multiplexing transmission device as the second embodiment of the present invention. Hereinafter, descriptions of contents overlapping with the structure of the optical code division multiplexing transmission method and the optical code division multiplexing transmission device of the first embodiment and the functions of each part will be omitted.

[0155] The optical code division multiplexing transmission device according to the second embodiment of the present invention also includes a transmitting unit 10 and a receiving unit 140 which are connected together through a transmission path 42 and constituted. The transmitting unit 10 includes an optical pulse train generator 12 , a modulation signal generator 14 , an optical modulator 16 , a first optical circulator ...

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Abstract

An object of the present invention is to adjust the operating wavelength of a decoder, in order to coordinate the operating characteristics of an encoder and the decoder. To this end, an optical code division multiplex transmission device of the present invention comprises a second SSFBG in the decoder, and has a mechanism to perform adjustment (phase adjustment step) of the fixation portion interval L which is the interval between a first and second fixation portions fixing in place the second SSFBG, such that the extent of the eye opening of optical pulses output from the second SSFBG is maximum. The extent of the eye opening is measured using a correlation waveform monitor, and the measurement data is sent to the wavelength control portion. A signal is sent from the wavelength control portion to the movement control portion to set the fixation portion interval L, based on data relating to the extent of the eye opening sent from the correlation waveform monitor.

Description

field of invention [0001] The invention relates to a method for encoding and decoding optical pulse signals in optical code division multiplex transmission, and a device for realizing the method. Background technique [0002] In recent years, due to the spread of the Internet, etc., the demand for communication is rapidly increasing. Accordingly, high-speed and large-capacity networks using optical fibers and the like are being installed. In order to construct such a high-speed and large-capacity optical network, a wavelength division multiplexing (WDM: Wavelength Division Multiplexing) transmission method is essential. In particular, a method of narrowing the wavelength interval of optical propagation waves distributed between channels and performing wavelength multiplexing at high density on the wavelength axis, that is, high-density WDM (Dense Wavelength Division Multiplexing) has attracted attention. [0003] However, in the DWDM system implementing this method, the wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/516G02B6/02G02F2/00H04B10/07H04B10/2507H04B10/61H04J13/00H04J14/00H04J14/04H04J14/06
CPCG02B6/022H04J14/005H04J14/00G02F2/00
Inventor 小林秀幸西木玲彥沓泽聪子
Owner OKI ELECTRIC IND CO LTD
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