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Modulation mode and transmission system for NRZ signal with right and left filtering

A technology of modulation method and transmission system, applied in the direction of electromagnetic wave transmission system, transmission system, wavelength division multiplexing system, etc., can solve problems such as difficult transmitters, and achieve the effect of improving performance

Inactive Publication Date: 2006-06-28
ALCATEL LUCENT SAS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, it is difficult to implement VSB at the transmitter due to the fast reconstruction of the suppressed sidebands by the nonlinear properties of the fiber

Method used

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  • Modulation mode and transmission system for NRZ signal with right and left filtering
  • Modulation mode and transmission system for NRZ signal with right and left filtering
  • Modulation mode and transmission system for NRZ signal with right and left filtering

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Embodiment Construction

[0028] The frequency spectrum of the intensity modulated signal is symmetrical to the carrier frequency of the wavelength channel. exist figure 1 The carrier is represented by a line. The left and right sides of the signal usually contain the same information. In the overlapping region indicated by the arrows, a clear distinction between the information of one channel and the information of an adjacent channel can no longer be clearly distinguished. With decreasing channel spacing, the overlapping area increases.

[0029] figure 2 A non-equidistant channel allocation is shown. The first two channels CH1 and CH2 are divided according to the spectral interval A. The interval of the next channel CH3 is B. Channel pairs that are separated by a greater spacing than the inter-channel spacing are then sent. The left side of channel CH1 and the right side of channel CH2 are now filtered with the filter function F. Then filter the left side of CH3 and the right side of CH4. I...

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Abstract

The invention shows a transmission system with a transmitter function, a transmitting fiber and a receiver function where the transmitter function comprising lightsources (1), modulators (2) and a multiplexer (3), and the receiver comprising at least a demultiplexer (5), filters and electrical receivers where the channels for left side filtering are modulated with modulators with a negative chirp and for right side filtering with modulators with positive chirp.

Description

technical field [0001] The invention relates to the field of sending digital data by optical means. More specifically it relates to wavelength-division multiplexing (WDM)-based high bit-rate transmission over long-distance fiber optic links. [0002] More specifically, the present invention relates to a modulation method for modulating a signal transmitted over a WDM transmission line in which left and right filtering is alternately performed for adjacent channels at the receiver with an alternating channel spacing of A and B, the channel filtered on the right is modulated by a modulator with positive chirp, and the channel filtered on the left is modulated by a modulator with negative chirp. [0003] The invention also relates to a transmission system with a transmitter, a transmission fiber and a receiver: wherein the transmitter comprises a laser source, an external modulator and a multiplexer, the receiver comprises at least one demultiplexer, a filter and receiver, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/04H04B10/06H04B10/2513
CPCH04B10/25137H04J14/02H04J14/0224
Inventor 斯巴斯丁·比格亚恩·弗里格纳克威尔弗雷德·爱德勒尤根·拉奇
Owner ALCATEL LUCENT SAS
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