Terabit transmission rate coherent light orthogonal frequency division multiplexing (OFDM) system based on optical comb

A technology of transmission rate and orthogonal frequency division, which is applied in the field of optical communication, can solve the problems that the device manufacturing process is difficult to meet this requirement, the structure of the receiver is complicated, and the structure of the transmitter is complicated, so as to improve the reliability and the feasibility of the system. Effect of increased complexity and cost, good hardware availability

Inactive Publication Date: 2011-10-19
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, from figure 1 It can be seen that the transmitter requires multiple RF oscillation sources, so the transmitter structure is more complicated
Moreover, since each RF oscillating source has independent phase noise, the phase estimation of each orthogonal OFDM frequency band must be performed separately in the OFDM baseband receiver of the rec...

Method used

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  • Terabit transmission rate coherent light orthogonal frequency division multiplexing (OFDM) system based on optical comb
  • Terabit transmission rate coherent light orthogonal frequency division multiplexing (OFDM) system based on optical comb
  • Terabit transmission rate coherent light orthogonal frequency division multiplexing (OFDM) system based on optical comb

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Embodiment 1

[0038] The terabit transmission rate coherent optical OFDM system based on the optical comb of the present invention includes a transmitting end and a receiving end, and the transmitting end includes an optical carrier generating module at the transmitting end, a baseband OFDM electrical signal generating module, and an orthogonal frequency band OFDM optical signal Generation module, optical signal output module, serial-to-parallel conversion module, such as image 3 shown. The receiving end includes an orthogonal frequency band OFDM optical signal recovery module, a receiving end local oscillator optical generation module, a photoelectric detection module, a baseband OFDM electrical signal demodulation module, and a parallel-to-serial conversion module, such as Figure 4 shown.

[0039] The specific structure of the transmitter is as follows Figure 5 As shown: the transmitter optical carrier generation module includes a transmitter laser, an optical comb generator, and an ...

Embodiment 2

[0047]The receiving end of Embodiment 1 needs to estimate and compensate the phase noise difference between the laser at the transmitting end and the local laser at the receiving end, and the processing process is completed in the digital signal processor of the OFDM baseband receiver. Since the baseband processing of laser phase noise estimation and compensation needs to be performed separately in each baseband OFDM signal, the processing delay at the receiving end is relatively long, and a more accurate phase estimation algorithm is required. Therefore, the receiving end of Embodiment 2 adopts the optical injection locking technology, and only needs to extract the unmodulated optical carrier in the received optical signal to complete the injection phase locking of the local laser at the receiving end. Embodiment 2 Compared with Embodiment 1, an optical frequency (optical carrier) is reserved in the optical comb at the transmitting end without modulation, and an optical inject...

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Abstract

The invention provides a feasible Terabit transmission rate coherent light orthogonal frequency division multiplexing system which is of simpler system structure, and comprises a transmitting end and a receiving end, wherein, the transmitting end comprises a transmitting end optical carrier generation module which comprises a transmitting end laser, an optical comb generator and an optical demultiplexer. In the system, on the basis of single light source, the optical comb generator is utilized to obtain light frequency combs with multiple wavelengths, which are used as optical carriers of base band OFDM signals, and mutually orthogonal OFDM frequency bands are generated on an optical domain, thus a plurality of radio frequency (RF) oscillation sources with complex structures are not need in the prior art. By utilizing the system, an OBM-COOFDM (orthogonal-band-multiplexed-coherent optical orthogonal frequency division multiplexing) optical signal is obtained under the condition of not using the RF oscillation sources, thus greatly reducing the complexity and cost of a transmitter; and the system has better feasibility of the OBM-COOFDM hardware, thus reducing the higher sampling rate requirements of the traditional COOFDM Terabit transceiver on a digital to analog converter (DAC) and an analog to digital converter (ADC).

Description

technical field [0001] The invention relates to the field of communication technology, in particular to optical communication technology. Background technique [0002] In recent years, with the rapid growth of broadband services, higher requirements have been put forward for the improvement of the transmission capacity of the core backbone network, and thus there has been a demand for single-channel transmission rates of 100Gb / s and 1Tb / s. High-speed electrical time division multiplexing (Electrical Time Division Multiplexing, ETDM) modulators and related technologies for photodetectors have not yet been fully commercialized. Therefore, high-speed ETDM systems still cannot be practically applied. On the other hand, the channel spacing of the current Wavelength Division Multiplexing (WDM) network is 50 GHz or 100 GHz standard of the International Telecommunications Union (ITU), which cannot fully meet the transmission of ultra-high-speed data signals. [0003] Based on this,...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04B10/12H04B10/572
Inventor 易兴文邓明亮张洪波张静邱昆
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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