Method for polarized quadrature modulating optical label based on residual sideband

A technology of vestigial sideband and polarization orthogonality, which is applied in the field of optoelectronic technology and optical fiber communication, and can solve the problems of reducing bandwidth utilization, complex implementation, and occupying optical fiber channels.

Inactive Publication Date: 2007-02-21
TSINGHUA UNIV
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Problems solved by technology

Among them, the first scheme requires a high-speed synchronous control circuit, which is more complicated to implement; the second scheme occupies an additional optical fiber channel, which reduces bandwidth utilization; the third scheme requires a high-frequency microwave processing circuit, which will introduce nonlinear effects

Method used

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  • Method for polarized quadrature modulating optical label based on residual sideband
  • Method for polarized quadrature modulating optical label based on residual sideband
  • Method for polarized quadrature modulating optical label based on residual sideband

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Embodiment Construction

[0063] Specific implementations such as Figure 5 shown. Use 43Gb / s Carrier Suppression Return to Zero (CSRZ) generator to generate payload signal. The CSRZ signal of the vestigial sideband is generated through an optical filter, and the center frequency of the filter is tunable to verify the influence of different center frequency offsets on the signal. Then the vestigial sideband loading signal is adjusted by a polarization controller (PC), so that the polarization direction is the same as that of LiNbO 3 The angle between the fast axis direction of the phase modulator is 45 degrees. The modulated label signal rate is 125Mb / s, and the modulation amplitude is V π . The optical signal added with the polarization modulation label enters the transmission system after being amplified. At the receiving end, a 50 / 50 optical splitter is used to divide the signal into two parts, and one part passes through a polarizer and enters a 125MHz bit error tester (BERT) to receive the op...

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Abstract

A method for modulating light counter mark based on offset quadrature of residual sideband includes expanding input light pulse to be wider by residual sideband filter for making time domain pulse form be move smooth before input signal light is modulated, dividing input light to two portions by beam splitter after said signal light is entered into input end, passing one portion through polarizer and using error code tester to receive light countermark signal, restoring another portion to be offset state by countermark eraser then sending it into the second error code tester to receive light load signal.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology and optical fiber communication technology. In particular, it relates to optical label modulation formats in optical label switched networks. Background technique [0002] In 1997, S.J.B.Yoo and G.K.Chang of Bellcore (Bell Communication Research Institute) proposed a solution to establish a next-generation optical network based on Optical Label Swapping (OLS) technology, which is a new optical network. The new mechanism and new technology of IP service access, it not only fully utilizes the light wave switching technology and label switching technology, but also absorbs the characteristics of IP business, simplifies the multi-layer protocol stack of the original data network, improves the processing efficiency, and Capable of switching and forwarding data packets with low latency and transparent to data rate and data format. Due to the use of label switching technology, the process of pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/00H04Q3/52H04J14/00H04B10/20
Inventor 陈宏伟陈明华谢世钟
Owner TSINGHUA UNIV
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