摘要 :
A new time division multiplexing technique named overlapped time division multiplexing (OVTDM) is presented in this paper. OVTDM technique provides a new method to achieve high spectral efficiency, and with this technique, high sp...
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A new time division multiplexing technique named overlapped time division multiplexing (OVTDM) is presented in this paper. OVTDM technique provides a new method to achieve high spectral efficiency, and with this technique, high spectral efficiency can be obtained even with low order modulation. Moreover, the performance of the OVTDM is better than that of QAM modulation in orthogonal frequency division multiplexing (OFDM) system with the same spectral efficiency. The advantage of OVTDM over QAM in OFDM becomes more and more obvious with the increase of the spectral efficiency. The spectral efficiency, reliability and complexity of OVTDM are analyzed in detail. Theoretical analysis and simulation results show that the OVTDM is the better signaling scheme in performance. However, its complexity grows exponentially with the increase of the spectral efficiency.
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摘要 :
A new time division multiplexing technique named overlapped time division multiplexing (OVTDM) is presented in this paper. OVTDM technique provides a new method to achieve high spectral efficiency, and with this technique, high sp...
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A new time division multiplexing technique named overlapped time division multiplexing (OVTDM) is presented in this paper. OVTDM technique provides a new method to achieve high spectral efficiency, and with this technique, high spectral efficiency can be
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摘要 :
Next generation metro aggregation systems are expected to use integrated lambda, circuit and packet switching platforms. We analyzed a typical Tier 1 aggregation scenario using a converged transport platform offering OTN, MPLS-TP ...
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Next generation metro aggregation systems are expected to use integrated lambda, circuit and packet switching platforms. We analyzed a typical Tier 1 aggregation scenario using a converged transport platform offering OTN, MPLS-TP and lambda switching. Vertical integration (multiple transport technologies) and horizontal integration (multiple service types) yielded about one third savings over a traditional L3 over DWDM approach. The number of wavelengths needed was roughly halved. The usage of hybrid interfaces which allow sharing the wavelength between OTN and MPLS services leads to additional savings which will increase as the line rate shifts from 10G to 40G and 100G.
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Combining subcarrier multiplexing and wavelength division multiplexing techniques, we demonstrate a 124-channel hybrid PON with 10-Gb/s downstream and 1.25-Gb/s upstream transmission. A single 32*32 AWG is used to distribute the b...
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Combining subcarrier multiplexing and wavelength division multiplexing techniques, we demonstrate a 124-channel hybrid PON with 10-Gb/s downstream and 1.25-Gb/s upstream transmission. A single 32*32 AWG is used to distribute the bidirectional wavelength channels for 124 users.
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We propose a dynamic wavelength and time slot assignment scheme for TWDM-PON based on inter-ONU priority rating. Simulation results show that the time delay and packet loss ratio are reduced compared with conventional EFT method.
摘要 :
We propose a dynamic wavelength and time slot assignment scheme for TWDM-PON based on inter-ONU priority rating. Simulation results show that the time delay and packet loss ratio are reduced compared with conventional EFT method.
摘要 :
As the successor of XG-PON, TWDM-PON can support smoothly migration and coexistence with GPON and XG-PON in the same ODN. The operation scheme, standard progress, key technologies, application scenarios and industrial status of TW...
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As the successor of XG-PON, TWDM-PON can support smoothly migration and coexistence with GPON and XG-PON in the same ODN. The operation scheme, standard progress, key technologies, application scenarios and industrial status of TWDM-PON will be introduced in this paper.
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摘要 :
As the successor of XG-PON, TWDM-PON can support smoothly migration and coexistence with GPON and XG-PON in the same ODN. The operation scheme, standard progress, key technologies, application scenarios and industrial status of TW...
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As the successor of XG-PON, TWDM-PON can support smoothly migration and coexistence with GPON and XG-PON in the same ODN. The operation scheme, standard progress, key technologies, application scenarios and industrial status of TWDM-PON will be introduced in this paper.
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摘要 :
Two signal multiplexing schemes have been proposed and experimentally demonstrated in optical time domain reflectometry (OTDR) for fault location of fibre optical transmission line to obtain high measurement efficiency. The backsc...
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Two signal multiplexing schemes have been proposed and experimentally demonstrated in optical time domain reflectometry (OTDR) for fault location of fibre optical transmission line to obtain high measurement efficiency. The backscattered Rayleigh light of the multiplexing probe signals is transferred to corresponding heterodyne intermediate frequency (IF) through heterodyning with single frequency local oscillator (LO). Then the detected signals are de-multiplexed and finally extracted by digital signal processing method. Experimental results show that by use of the multiplexing method, the measurement efficiency of OTDR can be enhanced by nearly 16 times.
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摘要 :
Two signal multiplexing schemes have been proposed and experimentally demonstrated in optical time domain reflectometry (OTDR) for fault location of fibre optical transmission line to obtain high measurement efficiency. The backsc...
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Two signal multiplexing schemes have been proposed and experimentally demonstrated in optical time domain reflectometry (OTDR) for fault location of fibre optical transmission line to obtain high measurement efficiency. The backscattered Rayleigh light of the multiplexing probe signals is transferred to corresponding heterodyne intermediate frequency (IF) through heterodyning with single frequency local oscillator (LO). Then the detected signals are demultiplexed and finally extracted by digital signal processing method. Experimental results show that by use of the multiplexing method, the measurement efficiency of OTDR can be enhanced by nearly 16 times.
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