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Modulation method and transmission device for single sideband optical signal of optical OFDM system

A technology of single sideband modulation and modulation method, which is applied in transmission systems, multi-frequency code systems, electromagnetic wave transmission systems, etc., can solve the problems of complex signal processing, weakened dispersion resistance, and high cost, and achieves cost reduction, difficulty reduction, and simplicity. The effect of direct detection

Inactive Publication Date: 2009-06-24
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0010] Method 1): This technology mainly includes two disadvantages: first, it is difficult to realize the optical filter, and the cost is high; second, if the baseband signal is first transferred to the radio frequency domain and then transferred to the optical domain, it will increase the system Bandwidth requirements, in this case, the purpose of achieving strong anti-dispersion by using SSB to reduce the bandwidth will be relatively weakened
[0011] Method 2): Although this technology avoids the use of optical filters to generate SSBs, and can transmit baseband OFDM signals to reduce bandwidth requirements, the system needs to perform more complex signal processing on the original signals in order to obtain SSBs suitable for generating SSBs. The input electrical modulation signal of the optical signal, especially in the case of analog optical transmission (especially subcarrier optical transmission), the original signal processing is more complicated
In this case, the complexity of the system is increased, and the difficulty of signal processing is increased.

Method used

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  • Modulation method and transmission device for single sideband optical signal of optical OFDM system
  • Modulation method and transmission device for single sideband optical signal of optical OFDM system
  • Modulation method and transmission device for single sideband optical signal of optical OFDM system

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Embodiment 1

[0068] Embodiment one, see figure 2 Detailed description, figure 2 It is a schematic flow chart of the system at the transmitter end of this embodiment.

[0069] Step 201: the system starts, first input the number sequence {a that needs to be transmitted in the optical transmission system n}.

[0070] Step 202: According to the basic principle of OFDM, the input {a n} for processing to obtain the baseband OFDM signal m(t) and its Hilbert transform signal

[0071] see image 3 , image 3 Basic schematic diagram generated for an OFDM signal. How to generate m(t) and Signal.

[0072] Generated for step 201 {a n}, the serial / parallel converter 301 first performs a serial-to-parallel conversion to convert the original serial bit data stream into a parallel bit data stream, and then enters the signal mapping module 302 .

[0073] The purpose of the signal mapping module 302 is to complete the corresponding modulation mapping for the parallel data stream according to t...

Embodiment 2

[0086] Embodiment two, see Figure 8 Detailed description, Figure 8 It is a schematic flow chart of the system at the transmitter end of this embodiment.

[0087] Step 801: the system starts, first input the number sequence {a n}.

[0088] Step 802: According to the basic principle of Orthogonal Frequency Division Multiplexing (OFDM), input {a n} for processing to obtain the baseband OFDM signal m(t) and its Hilbert transform signal

[0089] see figure 2 , figure 2 Basic schematic diagram generated for an OFDM signal. The specific generation steps and method are the same as step 202 in the first embodiment, and will not be repeated here. After step 802 still produces m(t) signal 306 and Signal 309.

[0090] Step 803: Modulate the baseband OFDM signal into the radio frequency domain.

[0091] To modulate the baseband signal into a radio frequency signal, the traditional method is to multiply the original signal by a radio frequency carrier Acos(2πf RF t) (A is ...

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Abstract

The invention discloses a single sideband optical signal modulation method and optical single sideband transmitter device realized through optical I,Q modulation in optical orthogonal frequency-division multiplexing system. The single sideband modulation method and transmitter device can realize optical single sideband modulation only through an optical I,Q modulator when the following condition is satisfied that an electrical modulation signal g(t) inputted to Q path of the optical I, Q modulator is Hilbert transformation of inputted electrical modulation signal in I path (g(t) is arbitrary real signal); meanwhile, the single sideband optical signal modulation method and transmitter device are applicable to optical orthogonal frequency-division multiplexing (OFDM) system, and are characterized in that the modulation method and transmitter device not only can be applied to base band OFDM system, but also can be applied to RF modulated OFDM system. The single sideband optical signal modulation method and optical single sideband transmitter device have the advantages that the structure is simple, the cost is low, the signal processing requirement is low and the invention is compliable with the system in the prior art.

Description

technical field [0001] The invention relates to a novel modulation method and an optical SSB transmitting device for realizing SSB optical signals through optical I and Q modulation in an optical OFDM system, belonging to the category of optical fiber communication systems. Background technique [0002] Since the mid-1990s, the great success of the commercialization of the Internet has prompted the data communication business volume to maintain a double-digit or even triple-digit growth rate, and with the continuous development and maturity of some new data services in the network (for example: IPTV business, video on demand VOD business, etc.), it can be expected that this growth rate will continue. The continuous development of data communication services brings about an increasing demand for transmission capacity and transmission bandwidth. At present, the rate requirement for a single-channel optical transmission system has been increased from 10Gbit / s to 40Gbit / s or ev...

Claims

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Application Information

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IPC IPC(8): H04B10/00H04B10/12H04B10/556H04L27/26
Inventor 乔耀军宁婧刘学君杜晓纪越峰
Owner BEIJING UNIV OF POSTS & TELECOMM
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