Transmission control method of wavelength division multiplexing system

A transmission control and wavelength division multiplexing technology, applied in the field of high-speed and large-capacity optical fiber transmission systems, can solve the problems of complex structure and high cost of the signal demodulation system at the receiving end

Inactive Publication Date: 2008-09-24
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings that the structure of the receiving end signal demodulation system in the NRZ-DPSK WDM system is quite complicated and the cost is very high, and realize the NRZ without any modification to the existing WDM system structure. - Demultiplexing and demodulation of DPSK signals

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  • Transmission control method of wavelength division multiplexing system
  • Transmission control method of wavelength division multiplexing system
  • Transmission control method of wavelength division multiplexing system

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Embodiment Construction

[0049] Such as image 3 Shown is a schematic diagram of the launch, transmission and reception of the new NRZ-DPSK WDM system. The working principles, implementation conditions and steps of each part are described in detail below.

[0050] Since the key of the present invention is to skillfully select the channels of the AWG at the transmitting end and the receiving end, so as to realize multiple functions. Therefore, first, the channel selection principles of the AWG at the transmitter and receiver are explained and explained:

[0051] According to different intervals (ie, channel intervals) of wavelengths (or frequencies) of optical signals transmitted by adjacent channels, the International Telecommunication Union (ITU) has made detailed regulations on the wavelength division multiplexing (WDM) system. WDM systems are divided into Dense Wavelength Division Multiplexing (DWDM) and Coarse Wavelength Division Multiplexing (CWDM).

[0052] The channel spacing of the DWDM sys...

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Abstract

The invention relates to the transmission control of a wavelength division multiplexing system (WDM) in a fiber optic transmission system and proposes a transmission control method of a WDM transmission system. A channel is selected on an array wave-guide grating (AWG) at the transmitting end at intervals to carry out multi-channel signal transmission under the situation of not changing the current WDM system; the interval amount is an integer parameter m which is larger than zero, but less than one second of the amount of the channels; the channel of a receiving end AWG corresponding to the channel of the transmitting end AWG transmission signal receives the original signal transmitted by the AWG channel of the transmitting end, downloads and carries out transferring or continuously transmitting; the demodulating signal of the original signal is received in the neighboring channel of a receiving channel and the information is selected by filter or directly picked up. The transmission control method of a WDM system provided by the invention can simultaneously realize the demodulating and de-multiplexing of a nonreturn-to-zero phase position demodulating mode in the wavelength division multiplexing system without needing to carry out any alternation on the original system or adding any apparatus and is suitable for transmitting a nonreturn-to-zero (NRZ) signal and a nonreturn-to-zero differential phase shift keying(NRZ-DPSK) signal with different speeds.

Description

technical field [0001] The invention relates to a high-speed and large-capacity optical fiber transmission system, in particular to a dense wavelength division multiplexing system of a non-return-to-zero differential phase-shift keying modulation format in the optical fiber transmission system. Background technique [0002] As a vector modulation format, the optical differential phase shift keying (DPSK) format can effectively suppress the nonlinear effects of various optical fibers, such as cross-phase modulation, self-phase modulation, etc., because it can realize constant envelope or approximately constant envelope transmission. , which is very suitable for high-speed and large-capacity optical fiber transmission systems, has been extensively studied in recent years. Among them, the non-return-to-zero differential phase-shift keying modulation format (NRZ-DPSK) is very suitable for application in the wavelength division system (WDM) due to its relatively narrow spectral w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02
Inventor 余宇张新亮黄德修
Owner HUAZHONG UNIV OF SCI & TECH
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