CN105578316B - OCDMA and OFDM mixed passive optical network system - Google Patents
OCDMA and OFDM mixed passive optical network system Download PDFInfo
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Abstract
The invention discloses a passive optical network system with mixed OCDMA and OFDM; at a transmitting end, input data is transmitted to an input end of an OFDM signal generator, an output end of the OFDM signal generator is connected with one input end of a transmitting external modulator, an output end of an OCDMA coding module is connected with the other input end of the transmitting external modulator, and an output end of the transmitting external modulator is connected with one end of an optical fiber. At the receiving end, the other end of the optical fiber is connected with one input end of the receiving external modulator, the output end of the OCDMA decoding module is connected with the other input end of the receiving external modulator, the output end of the receiving external modulator is connected with the input end of the OFDM signal decoder, and the output end of the OFDM signal decoder sends out output data. The invention fully utilizes the advantages of the OFDM technology and the OCDMA technology in the PON system, can fully utilize the data bandwidth and reduce the cost.
Description
Technical Field
The invention belongs to the technical field of optical fiber communication, and particularly relates to an OCDMA (orthogonal frequency division multiplexing) and OFDM (optical code division multiple access) mixed passive optical network system.
Background
With the advent of various new services and the ever-increasing bandwidth demand of people, the "last mile" has become the bottleneck of the access network. As a best method for solving the requirement of broadband optical access, a Passive Optical Network (PON) technology has been implemented in a certain scale in a considerable number of regions around the world, with advantages of high bandwidth, low cost, simple structure, good reliability, and the like. In the current PON technology, there are many implementation methods, which mainly include implementation schemes such as a wavelength division multiplexing passive optical network (WDM-PON), a time division multiplexing passive optical network (TDM-PON), an EPON (ethernet passive optical network), and a GPON (gigabit passive optical network).
The WDM-PON can provide a higher bandwidth capacity, but needs to increase the number of users by adding a wavelength. The TDM-PON technology has become mature and enters the business stage, but because the TDM-PON adopts the transmission mode of time division multiplexing and burst reception, these characteristics determine that the higher rate requirement, such as 40Gb/s or higher rate passive optical network, cannot be met only by improving the performance of the equipment. This is mainly due to the fact that in TDM-PON, the rate of system transmission is limited by factors such as device cost and fiber dispersion. At present, 10Gbit/s EPON and GPON technical standards are released, and corresponding products are released by various large operators. EPON technologies at 40Gbit/s and even 100Gbit/s are also a component of great interest to the research and industry. However, the current access network is the convergence of multiple service networks, and various new services appear. Current EPON and GPON technologies also become increasingly difficult to maintain, requiring better solutions to be found.
Disclosure of Invention
The technical problem to be solved by the invention is that the existing PON realization method is difficult to meet the growing multiple service network requirements, and provides a passive optical network system with mixed OCDMA and OFDM.
In order to solve the problems, the invention is realized by the following technical scheme:
a passive optical network system with mixed OCDMA and OFDM comprises a transmitting end and a receiving end, wherein the transmitting end and the receiving end are connected through optical fibers. The transmitting end consists of an OCDMA coding module, an OFDM signal generator and a transmitting external modulator; the input data is sent to the input end of the OFDM signal generator, the output end of the OFDM signal generator is connected with one input end of the sending external modulator, the output end of the OCDMA coding module is connected with the other input end of the sending external modulator, and the output end of the sending external modulator is connected with one end of the optical fiber. The receiving end consists of an OCDMA decoding module, an OFDM signal decoder and a receiving external modulator; the other end of the optical fiber is connected with one input end of the receiving external modulator, the output end of the OCDMA decoding module is connected with the other input end of the receiving external modulator, the output end of the receiving external modulator is connected with the input end of the OFDM signal decoder, and the output end of the OFDM signal decoder sends out output data.
The OCDMA coding module comprises a coding light source and a coding wavelength division multiplexer; the output end of the coding light source is connected with the input end of the coding wavelength division multiplexer, and the output end of the coding wavelength division multiplexer is connected with the sending external modulator.
The OFDM signal generator comprises a channel coding module, a sending serial-to-parallel conversion module, a constellation mapping module, a conjugate symmetry module, a pilot frequency insertion module, a training sequence module, an IFFT module, a cyclic prefix module, a sending parallel-to-serial conversion module and a digital-to-analog conversion module; the input end of the channel coding module is connected with input data, and the output end of the channel coding module is connected with the input end of the constellation mapping module through the sending serial-parallel conversion module; the output end of the constellation mapping module is connected with the input end of the pilot frequency inserting module through the conjugate symmetry module; the output of the pilot frequency insertion module is put behind the training sequence module and is sent to the IFFT module together; the output end of the IFFT module is connected with the input end of the sending parallel-serial conversion module through the cyclic prefix module; the output end of the sending parallel-serial conversion module is connected with the input end of the digital-to-analog conversion module, and the output end of the digital-to-analog conversion module is connected with the input end of the sending external modulator.
The OCDMA decoding module comprises a decoding light source and a decoding wavelength division multiplexer; the output end of the decoding light source is connected with the input end of the decoding wavelength division multiplexer, and the output end of the decoding wavelength division multiplexer is connected with the receiving external modulator.
The OFDM signal decoder comprises an analog-to-digital conversion module, a receiving serial-to-parallel conversion module, a cyclic prefix removing module, an FFT module, a channel equalization module, a symmetrical conjugation removing module, a constellation demapping module and a channel coding module; the input end of the analog-to-digital conversion module is connected with the output end of the receiving external modulator, and the output end of the analog-to-digital conversion module is connected with the input end of the receiving serial-parallel conversion module; the output end of the receiving serial-parallel conversion module is connected with the input end of the FFT module through the cyclic prefix removing module; the output end of the FFT module is connected with the input end of the desymmetry conjugation module through the channel equalization module, and the output end of the desymmetry conjugation module is connected with the input end of the channel coding module through the constellation demapping module; and the channel coding module sends out output data.
Compared with the prior art, the invention mainly has the following advantages:
1. the invention adopts a passive optical network mixed by Optical Code Division Multiple Access (OCDMA) and Orthogonal Frequency Division Multiplexing (OFDM), fully utilizes the advantages of the OFDM technology and the OCDMA technology in the PON system, such as the improvement of the frequency band utilization rate and the capability of resisting dispersion and polarization mode dispersion, such as the characteristics of asynchronous transmission, high transmission safety performance and the like, and compared with other traditional passive optical networks with the same number of users, the system has lower price;
2. the frequency spectrum of the OFDM electric signal output by the transmitting end only comprises a real part, and meanwhile, the OFDM electric signal is demodulated from the OCDMA address code sequence generated at the receiving end by adopting a direct detection technology, so that the complexity of the system is reduced, and the cost is saved;
3. the invention can provide FFT point of dynamic resource allocation according to the requirements of different users, and fully utilize data bandwidth.
Drawings
Fig. 1 is an overall block diagram of an OCDMA and OFDM hybrid passive optical network system.
Fig. 2 is a block diagram of an OCDMA encoding module.
Fig. 3 is a block diagram of an OFDM signal generator.
Fig. 4 is a block diagram of an OCDMA decode module.
Fig. 5 is a block diagram of an OFDM signal decoder.
Detailed Description
An OCDMA and OFDM hybrid passive optical network system, as shown in fig. 1, includes a transmitting end and a receiving end, where the transmitting end and the receiving end are connected by an optical fiber.
The transmitting end consists of an OCDMA coding module, an OFDM signal generator and a transmitting external modulator. The input data is sent to the input end of the OFDM signal generator, the output end of the OFDM signal generator is connected with one input end of the sending external modulator, the output end of the OCDMA coding module is connected with the other input end of the sending external modulator, and the output end of the sending external modulator is connected with one end of the optical fiber.
The OCDMA coding module comprises a coding light source and a coding wavelength division multiplexer, wherein the output end of the coding light source is connected with the input end of the coding wavelength division multiplexer, and the output end of the coding wavelength division multiplexer is connected with the sending external modulator. In the preferred embodiment of the invention, the coded light source is an amplified spontaneous emission ASE broadband light source, and the coded wavelength division multiplexer is realized by Fiber Bragg Gratings (FBGs) or photonic light wave circuits (PLCs). See fig. 2.
In the OCDMA coding module, a coding light source generates a stable optical signal and is connected with a coding wavelength division multiplexer at the later stage. The wide-spectrum light source of the encoding wavelength division multiplexer can filter out optical signals with multiple wavelengths, namely an OCDMA address code encoding sequence of a specific sequence is generated and then sent into the sending external modulator. In the sending external modulator, the modulated OFDM signal is coded by OCDMA address code coding sequence and sent into optical fiber channel. For example, (1101000) address code in (7, 3, 1) OOC code set, the wavelength division multiplexer is coded from 1550.0nm to 1552.4nm, and the wavelength interval is 0.4nm, i.e. the wavelengths of the optical signals output by the wavelength division multiplexer are 1550.0nm, 1550.4nm, 1550.8nm, 1551.2nm, 1551.6nm, 1552.0nm and 1552.4nm respectively. The OFDM signal generator comprises a channel coding module, a sending serial-to-parallel conversion module, a constellation mapping module, a conjugate symmetry module, a pilot frequency insertion module, a training sequence module, an IFFT (inverse Fourier transform) module, a cyclic prefix module, a sending parallel-to-serial conversion module and a digital-to-analog conversion module. The input end of the channel coding module is connected with input data, and the output end of the channel coding module is connected with the input end of the constellation mapping module through the sending serial-parallel conversion module. The output end of the constellation mapping module is connected with the input end of the pilot frequency inserting module through the conjugate symmetry module. The output of the pilot insertion module is put after the training sequence module and is sent to the IFFT module together. The output end of the IFFT module is connected with the input end of the sending parallel-serial conversion module through the cyclic prefix module. The output end of the sending parallel-serial conversion module is connected with the input end of the digital-to-analog conversion module, and the output end of the digital-to-analog conversion module is connected with the input end of the sending external modulator. See fig. 3.
The OFDM signal generator mainly generates a real part signal having a spectrum of only the OFDM electric signal. The specific working principle is as follows: the channel coding module performs a series of channel coding on the input signal, such as interleaving, convolution, RS code and other techniques, to increase the anti-interference performance of the input signal. The input signal after channel coding is sent to a sending serial-parallel conversion module, and a serial data stream is converted into a parallel data stream with a certain bit for the mapping of a later-stage constellation. The parallel data stream passing through the constellation mapping module is mapped on a specific coordinate point of the constellation diagram. The pilot frequency inserting module inserts pilot frequency information into a certain number of data after constellation mapping, wherein the number of the inserted pilot frequency information is determined according to the point number of the rear-stage IFFT module. If N-point IFFT is carried out, according to the conjugate symmetry of Fourier transform, an OFDM signal with a frequency spectrum only with a real part signal effective is obtained. And loading data to N/2 points before IFFT, wherein the data of the last N/2 points is conjugate symmetry of the data of the first N/2 points, and the imaginary part of the output complex data is 0, namely a real part signal. And the training sequence module adds the IFFT local training sequence to the IFFT real part signal head. The cyclic prefix module adds a cyclic prefix to the real part data which is added with the local training sequence and is subjected to IFFT transformation so as to prevent intersymbol interference. The sending parallel-serial conversion module and the digital-to-analog conversion module respectively carry out parallel-serial conversion and digital-to-analog conversion on the data added with the cyclic prefix, and then the data are sent to the sending external modulator.
The receiving end consists of an OCDMA decoding module, an OFDM signal decoder and a receiving external modulator. The other end of the optical fiber is connected with one input end of the receiving external modulator, the output end of the OCDMA decoding module is connected with the other input end of the receiving external modulator, the output end of the receiving external modulator is connected with the input end of the OFDM signal decoder, and the output end of the OFDM signal decoder sends out output data.
The OCDMA decoding module is consistent with the OCDMA coding module in structure and comprises a decoding light source and a decoding wavelength division multiplexer, wherein the output end of the decoding light source is connected with the input end of the decoding wavelength division multiplexer, and the output end of the decoding wavelength division multiplexer is connected with a receiving external modulator. In the preferred embodiment of the invention, the decoding light source is an amplified spontaneous emission ASE broadband light source, and the decoding wavelength division multiplexer is realized by Fiber Bragg Gratings (FBGs) or photonic light wave circuits (PLCs). See fig. 4.
In the OCDMA decoding module, a decoding light source generates a stable optical signal and is connected with a decoding wavelength division demultiplexer at the later stage. The wide spectrum light source of the decoding wavelength division demultiplexer filters out optical signals with a plurality of wavelengths, generates an OCDMA address code decoding sequence strictly consistent with a transmitting end, and then transmits the OCDMA address code decoding sequence into a receiving external modulator. In the receiving external modulator, the modulated OFDM signal is encoded by OCDMA address code decoding sequence and sent into optical fiber channel.
The OFDM signal decoder comprises an analog-to-digital conversion module, a receiving serial-to-parallel conversion module, a cyclic prefix removing module, an FFT (Fourier transform) module, a channel equalization module, a symmetrical conjugation removing module, a constellation demapping module and a channel coding module. The input end of the analog-to-digital conversion module is connected with the output end of the receiving external modulator, and the output end of the analog-to-digital conversion module is connected with the input end of the receiving serial-parallel conversion module. The output end of the receiving serial-parallel conversion module is connected with the input end of the FFT module through the cyclic prefix removing module. The output end of the FFT module is connected with the input end of the desymmetry conjugation module through the channel equalization module, and the output end of the desymmetry conjugation module is connected with the input end of the channel coding module through the constellation demapping module. And the channel coding module sends out output data. See fig. 5. Since the training sequence is a sequence known to both the sender and receiver. The received known sequence is synchronized and equalized at the receiving end. I.e. the method of channel estimation is used to track the corresponding change of the channel, so as to correct and recover the received data.
The OFDM signal decoder is mainly for restoring the user signal. The specific working principle is as follows: and the OFDM electric signal which is only valid in real part signal and generated by the receiving external modulator is accessed to the analog-digital conversion module. The analog-to-digital conversion module sends the digital signal output after the analog-to-digital conversion to the receiving serial-to-parallel conversion module for serial-to-parallel conversion. And the cyclic prefix removing module is used for removing the cyclic prefix of the parallel data, and the data without the cyclic prefix comprises a known training sequence and data after IFFT after the data is input. The FFT module respectively performs FFT operation of corresponding points on the data of the two parts. And the channel equalization module performs channel equalization according to the data of the known training sequence after FFT. And the result of the channel equalization is sent to a constellation demapping module after the conjugation symmetry is removed, the threshold value of the constellation is dynamically adjusted, and meanwhile, the data of the training sequence removed after the FFT is demapped. According to the symmetrical conjugation of the Fourier transform real part signal frequency spectrum, the first N/2 data of constellation demapping are effective data, and the last N/2 data are conjugation of the effective data. The output last N/2 data is not processed, and the output first N/2 effective data is the data after the channel coding of the sending end. And the channel decoding module comprises de-interleaving, viterbi decoding, RS code and the like. And the modules respectively correspond to interleaving, convolution, RS codes and the like of channel coding of the sending end.
The OFDM technology is from the field of radio frequency transmission, can realize higher spectrum utilization rate when applied to the PON technology, and has the capability of resisting dispersion and polarization mode dispersion. The OCDMA technology is a communication mode combining Code Division Multiple Access (CDMA) technology with optical fiber communication, and has the characteristics of supporting asynchronous transmission, being transparent in transmission protocol and sharing channels by users. The invention fully utilizes the outstanding advantages of OFDM and OCDMA, and effectively combines the OFDM technology and the OCDMA technology to realize a mixed passive optical network, which has the characteristics of high spectrum utilization rate, dispersion resistance and polarization mode dispersion resistance, good compatibility and expansibility of a transmission system, excellent bandwidth allocation mechanism, asynchronous transmission, high system safety performance and the like.
Claims (1)
1. A kind of OCDMA and OFDM mixed passive optical network system, including sending end and receiving end, sending end and receiving end pass the optical fiber connection; the method is characterized in that:
the transmitting end consists of an OCDMA coding module, an OFDM signal generator and a transmitting external modulator; the input data is sent to the input end of the OFDM signal generator, the output end of the OFDM signal generator is connected with one input end of the sending external modulator, the output end of the OCDMA coding module is connected with the other input end of the sending external modulator, and the output end of the sending external modulator is connected with one end of the optical fiber;
the receiving end consists of an OCDMA decoding module, an OFDM signal decoder and a receiving external modulator; the other end of the optical fiber is connected with one input end of the receiving external modulator, the output end of the OCDMA decoding module is connected with the other input end of the receiving external modulator, the output end of the receiving external modulator is connected with the input end of the OFDM signal decoder, and the output end of the OFDM signal decoder sends out output data;
the OCDMA coding module comprises a coding light source and a coding wavelength division multiplexer; the output end of the coding light source is connected with the input end of the coding wavelength division multiplexer, and the output end of the coding wavelength division multiplexer is connected with the sending external modulator;
the OFDM signal generator comprises a channel coding module, a sending serial-to-parallel conversion module, a constellation mapping module, a conjugate symmetry module, a pilot frequency insertion module, a training sequence module, an IFFT module, a cyclic prefix module, a sending parallel-to-serial conversion module and a digital-to-analog conversion module; the input end of the channel coding module is connected with input data, and the output end of the channel coding module is connected with the input end of the constellation mapping module through the sending serial-parallel conversion module; the output end of the constellation mapping module is connected with the input end of the pilot frequency inserting module through the conjugate symmetry module; the output ends of the pilot frequency insertion module and the training sequence module are connected to the input end of the IFFT module; the output end of the IFFT module is connected with the input end of the sending parallel-serial conversion module through the cyclic prefix module; the output end of the sending parallel-serial conversion module is connected with the input end of the digital-to-analog conversion module, and the output end of the digital-to-analog conversion module is connected with the input end of the sending external modulator;
the OCDMA decoding module comprises a decoding light source and a decoding wavelength division multiplexer; the output end of the decoding light source is connected with the input end of the decoding wavelength division multiplexer, and the output end of the decoding wavelength division multiplexer is connected with the receiving external modulator;
the OFDM signal decoder comprises an analog-to-digital conversion module, a receiving serial-to-parallel conversion module, a cyclic prefix removing module, an FFT module, a channel equalization module, a symmetrical conjugation removing module, a constellation demapping module and a channel coding module; the input end of the analog-to-digital conversion module is connected with the output end of the receiving external modulator, and the output end of the analog-to-digital conversion module is connected with the input end of the receiving serial-parallel conversion module; the output end of the receiving serial-parallel conversion module is connected with the input end of the FFT module through the cyclic prefix removing module; the output end of the FFT module is connected with the input end of the desymmetry conjugation module through the channel equalization module, and the output end of the desymmetry conjugation module is connected with the input end of the channel coding module through the constellation demapping module; and the channel coding module sends out output data.
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