High speed full optical Orthogonal Frequency Division Multiplexing system and method thereof

An orthogonal frequency division, high-speed technology, applied in the field of all-optical orthogonal frequency division multiplexing, can solve problems such as system performance limitations, and achieve the effect of improving system performance

Inactive Publication Date: 2009-10-14
TSINGHUA UNIV
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  • Abstract
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Problems solved by technology

However, whether a higher modulation format or a single sideband modulation technique is used, the system performance is ultimately limited by the bandwidth of the electronic device

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  • High speed full optical Orthogonal Frequency Division Multiplexing system and method thereof
  • High speed full optical Orthogonal Frequency Division Multiplexing system and method thereof
  • High speed full optical Orthogonal Frequency Division Multiplexing system and method thereof

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Embodiment Construction

[0035] The high-speed all-optical OFDM system proposed by the present invention and its modulation and demodulation method are described as follows in conjunction with the accompanying drawings and embodiments.

[0036] Embodiments of the high-speed all-optical OFDM system of the present invention are as follows figure 1 As shown, it includes: MLLD: mode-locked laser, used to generate ultrashort optical pulse signals; PPG: pulse waveform generator, used to generate data signals; MZM: Mach-Zehnder modulator, used to load data information on the On the ultrashort optical pulse signal; EDL: electrically adjustable delay line, used to synchronize the modulation signal with the ultrashort pulse train; two optocouplers, used to separate and combine two carrier signals; ATT: attenuator; EDFA: Erbium-doped fiber amplifier, which is used together with the attenuator to control the two signals to have the same power; ODL: Optically adjustable delay line, used on the second signal to kee...

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Abstract

The invention provides a high speed full optical Orthogonal Frequency Division Multiplexing (OFDM) system and a modulation / demodulation method thereof. In the method, a laser generates an ultrashort pulse signal which is then modulated according to a certain modulation code sequence; the pulse series of the modulation signal and the ultrashort pulse signal are synchronized through an electricallyadjustable delay line; the modulated signal is divided into two ways of signals through a first coupler; the two ways of signals are multiplexed respectively through a first multiplexer and a second multiplexer; the multiplexed signals are integrated through a second coupler; and the integrated signals are demultiplexed through a de-multiplexer. By using the high speed signal processing techniquein optical fiber, the system and the method realize the full optical domain OFDM modulation and demodulation, thus obtaining greater operation bandwidth and higher processing speed.

Description

technical field [0001] The invention relates to the technical fields of optoelectronics and optical fiber communication, in particular to an all-optical orthogonal frequency division multiplexing technology applied in a high-speed optical fiber communication system. Background technique [0002] The Orthogonal Frequency Division Multiplexing (OFDM) technology has been proposed for nearly 40 years, and it is a multiplexing method with high spectral efficiency of multiple carriers. In recent years, with the rapid development of digital signal processing (DSP) technology, OFDM, as a high-speed wireless transmission technology that can effectively combat ISI, has received extensive attention. OFDM technology has been successfully used in systems such as Asymmetric Digital Subscriber Line (ADSL), Wireless Local Loop (WLL), Digital Audio Broadcasting (DAB), High Definition Television (HDTV), Wireless Local Area Network (WLAN), etc. Eliminate the ISI phenomenon caused by signal mu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J14/02G02B6/02G02F1/03
Inventor 陈宏伟尹飞飞陈明华谢世钟
Owner TSINGHUA UNIV
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