Optical modulating transmission method and system

A transmission method and transmission system technology, which is applied in the direction of optical transmission system, transmission system, electromagnetic wave transmission system, etc., can solve the problems of large impact on main business, limited length of coding sequence, and small amount of information in top-tuning business, so as to improve bit error Rate performance index, the effect of overcoming the limitation of carrier-to-noise ratio

Inactive Publication Date: 2005-02-16
HUAWEI TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0005] The disadvantage of using digital coding to adjust the top is that the length of the coding sequence is limited
When the top adjustment service is effectively received, it will have a great impact on the main service
If the coding sequence is very long, the information volume of the top tuning service will be small if the main service is not greatly affected; if the coding sequence is relatively short, it will increase the bit error rate of the top tuning service, which is not conducive to top tuning Efficient reception of business

Method used

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  • Optical modulating transmission method and system
  • Optical modulating transmission method and system
  • Optical modulating transmission method and system

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Embodiment Construction

[0016] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0017] Any carrier signal has three characteristics: amplitude (A), frequency (f), and phase (P). Correspondingly, digital modulation has three basic techniques: amplitude modulation (ASK), frequency modulation (FSK) and phase modulation (PSK). The basic function of digital modulation is a waveform transformation technology, which converts the baseband waveform that is not suitable for transmission in a given channel into another waveform suitable for channel transmission, and improves the signal through the interchangeability of bandwidth and signal-to-noise ratio. anti-interference performance.

[0018] Such as figure 2 As shown, at the sending end, the FSK modulator performs FSK modulation on the monitoring information to be transmitted, and modulates it onto a suitable carrier (about 10MHz). Then modulate the laser with the FSK modulation signa...

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Abstract

The method includes following steps: first, at sending end, processing of transform with physical character is carried out for data signal including original information of pilot tone modulation so as to generate signal of pilot tone modulation, then transmission is carried out; at receiving end, original signal of pilot tone modulation is recovered after processing of transform is carried out at receiving end in physical character opposite to sending end. The system includes information destination unit, modulation unit, spread spectrum unit, electro-optical conversion unit, optical fiber, optical-electro conversion unit, signal extraction unit, de-spread unit, and demodulation unit. The invention raises performance of error rate overcomes restriction of carrier-to-noise ratio. Thus, signal of pilot tone modulation can be recovered under bad SNR.

Description

[technical field] [0001] The invention relates to an optical network transmission technology. [Background technique] [0002] Since the 1990s, with the rapid development of WDM (Wavelength Division Multiplexing) technology, the research on technologies related to its application, such as channel monitoring technology, has also been carried out. There are three ways to transmit network monitoring information, that is, using a specific wavelength monitoring channel, top tuning and section overhead. Pilot Tone refers to superimposing a small analog or digital signal on the signal (main service) at the transmitter as a pilot service, and transmitting it on the optical transmission channel to complete the function of the optical monitoring channel. The information of the top-tuning service mainly includes wavelength identification ID, status information, optical channel connection, optical channel quality, etc. Through it, real-time monitoring of the status of each channel can b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/00H04B10/02H04B10/08H04B10/155H04B10/50H04B10/54H04B10/556H04B10/69
CPCH04B10/5563H04B10/541H04B10/5561H04B10/00H04B10/69H04B2210/075H04B10/505
Inventor 武永军沙兴跃
Owner HUAWEI TECH CO LTD
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