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Transmitter of OOFDM system and method of delay caused by pre-compensated optical fibre dispersion

A fiber dispersion and pre-compensation technology, which is used in the selection device of multiplexing systems, transmission systems, multi-frequency code systems, etc., and can solve the problems of long protection interval and serious fiber dispersion.

Active Publication Date: 2010-11-24
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the protection interval can solve the problem of group delay variation caused by fiber dispersion, the more serious the fiber dispersion is, the longer the additional protection interval is required

Method used

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  • Transmitter of OOFDM system and method of delay caused by pre-compensated optical fibre dispersion
  • Transmitter of OOFDM system and method of delay caused by pre-compensated optical fibre dispersion
  • Transmitter of OOFDM system and method of delay caused by pre-compensated optical fibre dispersion

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Embodiment Construction

[0074] First, see image 3 , which is a schematic diagram of the system architecture of the transmitter 10 and the receiver 60 of the optical orthogonal multiplexing system according to an embodiment of the present invention. It can be seen from the figure that the transmitter 10 converts a digital sequence signal 90 into an optical signal 94 and then transmits it. The optical signal 94 is received by the receiver 60 after being transmitted by the optical fiber 80 and amplified by the optical amplifier 82 .

[0075] Wherein, the optical signal 94 is an OFDM optical signal 94 . The aforementioned optical amplifier 82 may be, but not limited to, an erbium-doped fiber amplifier. The aforementioned optical fiber 80 is but not limited to a single mode optical fiber (Single mode fiber).

[0076] After receiving the optical signal 94 , the receiver 60 estimates the total delay time of the group delay caused by the dispersion of the optical signal 94 , and then sends the total dela...

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PUM

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Abstract

The invention discloses a transmitter of an OOFDM system and a method of delay caused by pre-compensated optical fibre dispersion. The pre-compensated method comprises the steps of: receiving a plurality of pre-compensated values corresponding to a subcarrier; transmitting the subcarrier after the time for delaying the corresponding pre-compensated value; estimating the delay time among the subcarriers at the receiver end and setting the pre-compensated value of the transmitter based on the delay time. The transmitter delays the pre-compensated value when the subcarrier is transmitted out so that the subcarrier reaches the receiver during the period of time consistent to achieve the purpose of delay caused by the pre-compensated optical fibre dispersion.

Description

technical field [0001] The present invention relates to a transmitter and method for pre-compensating delay caused by optical fiber dispersion in a system using Optical Orthogonal Frequency-division Multiplexing (OOFDM) technology. Background technique [0002] An Orthogonal Frequency-division Multiplexing (OFDM) system is a Frequency-division Multiplexing (FDM) system that adopts a digital multi-carrier modulation (Digital multi-carrier modulation) method. A plurality of orthogonal sub-carriers (orthogonal sub-carriers, also referred to as sub-bands or sub-carriers) are used to transmit data. These data are divided into multiple parallel data streams (data streams) or channels (Channels) corresponding to each sub-carrier. Each subcarrier is transmitted using a quadrature modulation technique with a low symbol rate. In this way, more total data rates (total data rates) than conventional single-carriers can be obtained within the same bandwidth. [0003] Please refer to F...

Claims

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Application Information

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IPC IPC(8): H04B10/18H04Q11/00H04L27/26H04B10/2525
Inventor 林玉明
Owner IND TECH RES INST
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