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Duobinary optical transmission apparatus

A duobinary and optical transmission technology, applied in optical fiber transmission, transmission system, multi-mode transmission, etc., can solve the problems of signal transmission characteristic degradation and difficulty

Inactive Publication Date: 2004-06-09
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the disadvantage of the aforementioned conventional binary optical transmission system is that when high-speed data signals are used, the XOR gate inevitably produces an undesired time delay exceeding at least one data bit
As a result, this leads to the difficulty of making such a precoder
Meanwhile, traditional duobinary optical transmission systems suffer from pseudo-random bit sequences (PRBS) when using electrical LPFs to generate tri-level data signals
Therefore, with the gradual increase of the length of the PRBS, the transmission characteristics of the signal are seriously degraded, which leads to the difficulty in the system implementation process

Method used

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Embodiment Construction

[0028] In the following description of the present invention, for purposes of explanation rather than limitation, specific details are set forth such as particular architectures, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. Also, it will be appreciated that certain aspects of the figures have been simplified for explanatory purposes and that the complete system environment of the present invention will include many known functions and configurations, all of which need not be shown here. In these drawings, the same reference symbols are used to designate the same or similar components even if they are represented in different drawings.

[0029] Fig. 3 is a block diagram of a duobinary optical transmission system according to a preferred embodiment of the present i...

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Abstract

Provided is a duobinary optical transmission apparatus with characteristics immune to wavelength division without being affected by transmission characteristics for a PRBS (pseudo-random bit sequence) and without using an existing feedback precoder and an electric low-pass filter. The duobinary optical transmission apparatus includes a T flip-flop (toggle flip-flop) and an AND gate in addition to a drive amplifier, a Mach-Zehnder-interferometer-optical intensity modulator and a laser light source for outputting an optical carrier. Thus, an input data signal is separated for each '1' group and modulated to include mutually different phases.

Description

technical field [0001] The invention relates to a duobinary optical transmission device. Background technique [0002] Typically, a Dense Wavelength Division Multiplexing (DWDM) optical transmission system uses a single optical fiber to transmit optical signals, and in this way, it improves transmission efficiency. An optical signal consists of multiple channels with different wavelengths. In addition, since it transmits optical signals regardless of the transmission rate, the DWDM optical transmission system has been widely used for ultra-high-speed Internet, and has rapidly improved data transmission quality. Such a newly developed system satisfies the rapidly increasing data flow requirements, as well as the transmission requirements of high-speed data exceeding 40Gbps. [0003] However, conventional light intensity modulation methods using a non-return-to-zero (NRZ) method have many limitations. For example, since burst interference and distortion between channels occ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/61H04B10/2513H04B10/40H04B10/50H04B10/516H04B10/54H04B10/60
CPCH04B10/505H04B10/5055H04B10/503H04B10/5167H04B10/50H04B10/516H04B10/2581
Inventor 金晟基李汉林吴润济黄星泽
Owner SAMSUNG ELECTRONICS CO LTD