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Method and apparatus for signal processing by light waveform shaping

a light waveform and signal processing technology, applied in electromagnetic transmission, electromagnetic transceivers, transmission, etc., can solve the problem of difficult to achieve the expansion of the use of such converters, and achieve the effect of narrow bandwidth and low sampling ra

Inactive Publication Date: 2018-06-21
NAT SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an apparatus for signal processing by light waveform shaping, which uses a DAC and an ADC for generating and receiving signals. The module includes an optical modulation module and an optical gating to prevent suppression of high-frequency signals and eliminate low-pass effects, respectively. The technique helps to preserve high-frequency signal portions, which can overcome limitations of conventional methods and facilitate the use of more extensive DDM techniques.

Problems solved by technology

While the development of the latter converter contributes greatly to reducing power consumption and simplifying computation, extensive use of such converters is difficult to achieve.

Method used

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  • Method and apparatus for signal processing by light waveform shaping
  • Method and apparatus for signal processing by light waveform shaping
  • Method and apparatus for signal processing by light waveform shaping

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Embodiment Construction

[0019]The present invention incorporates the foregoing technical features into a method and apparatus for signal processing by light waveform shaping. The major effects of the method and apparatus can be readily understood by reference to the embodiment described below, where the DDM-OFDMA PON technique is applied by way of example.

[0020]Referring to FIG. 1 and FIG. 2, a central office (CO) A is connected to at least one optical network unit (ONU) 10 via a single-mode optical fiber B. Each ONU 10 includes one apparatus of the present invention for processing signals by light waveform shaping. The apparatus of the present invention includes a low-sampling-rate (LSR), narrow-bandwidth digital-to-analog converter (DAC) 1, an LSR narrow-bandwidth analog-to-digital converter (ADC) 2, and a light waveform shaping module 3. The DAC 1 is configured to generate an uplink signal while the ADC 2 is configured to receive a downlink signal.

[0021]As shown in FIG. 1 and FIG. 2, the light waveform ...

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Abstract

A method and apparatus for signal processing by light waveform shaping are provided to process an uplink signal generated by a digital-to-analog converter (DAC) and / or process a downlink signal to be transmitted to an analog-to-digital converter (ADC). The method includes adjusting the waveform of the uplink signal and / or the waveform of the downlink signal with a light waveform shaping module so that, even if the DAC and / or ADC has a low sampling rate and a narrow bandwidth, a high-frequency signal portion of the uplink signal and / or a high-frequency signal portion of the downlink signal can be preserved.

Description

BACKGROUND OF THE INVENTION1. Technical Field[0001]The present invention relates to a method and apparatus for signal processing and more particularly to a method and apparatus for processing an uplink signal and / or a downlink signal by a light waveform shaping technique.2. Description of Related Art[0002]The sampling rate of a conventional analog-to-digital converter (ADC) or digital-to-analog converter (DAC) is in direct proportion to the bandwidth of the converter, and yet the latest signal processing techniques, such as the delay-division-multiplexing OFDMA (orthogonal frequency-division multiple access) passive optical network (DDM-OFDMA PON) technique, require a converter with a low sampling rate and a wide bandwidth. While the development of the latter converter contributes greatly to reducing power consumption and simplifying computation, extensive use of such converters is difficult to achieve.BRIEF SUMMARY OF THE INVENTION[0003]In order for a conventional converter, whose ...

Claims

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Application Information

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IPC IPC(8): H04Q11/00H04B10/516H04B10/50H04B1/00H04B10/27
CPCH04Q11/0005H04B10/516H04B10/503H04Q2011/0039H04B10/27H04Q2011/0013H04B1/0028H04B10/40
Inventor WEI, CHIA-CHIEN
Owner NAT SUN YAT SEN UNIV