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Method for processing a digital signal being transmitted through a non-linear device and apparatus using the same

A nonlinear device and digital signal technology, applied in electrical components, electromagnetic transmitters, pulse shaping, etc., can solve the problems of unfavorable signal integrity of optical signals, inter-symbol interference, etc.

Active Publication Date: 2014-10-15
MOBIX LABS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the pulse duration is too short to ensure the stability (shaping) of the optical signal, intersymbol interference may occur
This is detrimental to the signal integrity of the optical signal

Method used

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  • Method for processing a digital signal being transmitted through a non-linear device and apparatus using the same
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Embodiment Construction

[0027] now refer to Figure 4, shows an advantageous embodiment of the transmitter according to the invention. A transmitter 400 according to the present invention includes a pre-emphasis driver 401 and a nonlinear device 402 connected to the pre-emphasis driver 401 . The pre-emphasis driver 401 is adapted to receive at its input an electrical digital signal comprising at least one (binary) pulse, to pre-emphasize / peak the received electrical digital signal, and to output the pre-emphasized electrical digital signal. Non-linear device 402 is adapted to receive at its input the pre-emphasized electrical digital signal output by pre-emphasis driver 401, process the received signal, and output the digital signal to a transmission medium ( Figure 4 not shown). The nonlinear device 402 is any one of a laser diode, a light emitting diode, a transistor, and an amplifier. According to the nonlinear device 402 used, the digital signal output by the nonlinear device 402 is either an...

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Abstract

The present invention relates to a method for processing a digital signal through a non-linear device. The digital signal makes a first transition from a first level to a second level. The method comprises a step of pre-emphasizing the digital signal; and a step of processing the pre-emphasized digital signal by the non-linear device. The step of pre-emphasizing the digital signal includes pre-emphasizing the digital signal by applying an undershoot to the first level before the first transition, when the first level is lower than the second level; and / or pre-emphasizing the digital signal by applying an overshoot to the first level before the first transition, when the first level is higher than the second level. The present invention also relates to an apparatus using the above method.

Description

technical field [0001] The present invention relates to a method for improving the quality of signals transmitted through nonlinear electrical and / or optical devices at high speed. The invention also relates to a device using this method. Background technique [0002] Signal integrity has become a major concern due to high data rates in recently developed communication systems having data transfer rates of, for example, 25 Gbps. [0003] One of the causes of signal degradation is the transmission of the signal through a bandwidth-limited channel, ie in the channel, the transmission is significantly reduced above a certain frequency (cutoff frequency). Passing a signal through such a channel results in attenuation of high frequency components. This filtering of the transmitted signal affects the shape of the pulses reaching the receiver. Not only is the shape of the pulse changed within its symbol period, but it is also extended to subsequent symbol periods. When a signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/50H04B10/58
CPCH04B10/58H04B10/502H03K5/01
Inventor M.G.查辛斯基N.P.奇迪卡
Owner MOBIX LABS INC
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