Polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system

A passive optical network, polarization technology, applied in the field of optical communication, can solve the problem of high bandwidth requirements of optical and electrical devices, and achieve the effect of overcoming polarization crosstalk, low complexity, and simple MIMO equalization algorithm

Inactive Publication Date: 2011-11-09
PEKING UNIV
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Problems solved by technology

[0022] For OFDM/SCFDM signal transmission at 40-Gb/s and higher rates in the pr

Method used

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  • Polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system
  • Polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system
  • Polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system

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Embodiment Construction

[0046] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0047] The technology of the present invention proposes a polarization-interleaved OFDM / SCFDM-based PON system structure, and the OLT unit structure of the system is as follows Figure 8 As shown, the ONU unit structure of the system is as follows Figure 9shown. At the OLT end, two optical carriers with a certain frequency interval (the frequency interval is f 0 ) carrying up-conversion (f c ) OFDM / SCFDM signal, Figure 8 The spectrum at a and b in the middle is as Figure 10 (a) and (b) shown. The polarization beam combiner combines the two orthogonal signals into one, and the spectrum at point c is as follows Figure 10 (c) shown. In order to achieve polarization interleaving, the frequency separation of two optical carriers should satisfy f 0 > f 1 + f 2 , f 1 with f 2 Respectively represent the frequency separation between the farthest end of the sign...

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Abstract

The invention discloses a polarized interweaving OFDM (Orthogonal Frequency Division Multiplexing)/SCFDM (Singe Carrier Frequency Division Multiplexing) passive optical network system, belonging to the field of optical communication. During single sideband transmission of the system, an OLT (Optical Line Terminal) unit comprises carrier modulating units 1 and 2, wherein the carrier modulating unit 1 is connected with a beam combination input end of a polarized beam combiner; the control end of an electro-optical modulator 1 is connected with a transmitter through an up-converter 1; the carrier modulating unit 2 is connected with the other beam combination input end of the polarized beam combiner through an electro-optical modulator 2; the electro-optical modulator 2 is connected with a transmitter through an up-converter 2; the beam combination output end of the polarized beam combiner is connected with a wave filter; a frequency interval exists between the output frequency of the carrier modulating unit 1 and the output frequency of the carrier modulating unit 2; an ONU (Optical Network Unit) comprises a polarized beam splitter and an MIMO (Multiple Input Multiple Output) receiver; and a 2*2 MIMO equalization algorithm is adopted for the MIMO receiver. According to the system, the problem of polarization crosstalk is solved, and the transmission bandwidth is increased.

Description

technical field [0001] The invention relates to a passive optical network system, in particular to a polarization-interleaved OFDM / SCFDM PON system, which belongs to the field of optical communication. Background technique [0002] Introduction to some terms and their abbreviations commonly used in this field: Passive Optical Network (PON), Optical Distribution Network (ODN), Orthogonal Frequency Division Multiplexing (OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Asynchronous Transfer mode (ATM), optical line terminal (OLT), optical network unit (ONU), optical distribution network (ODN), single carrier frequency division multiplexing (SCFDM), single carrier frequency division multiple access (SCFDMA), peak-to-average ratio ( PAPR), polarization multiplexing (PDM), digital signal processing (DSP), polarization interleaving (P1), multiple-input multiple-output (MIMO). [0003] Optical fiber communication technology is one of the important pillars of modern co...

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Application Information

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IPC IPC(8): H04L1/06H04L25/03H04Q11/00
Inventor 李巨浩林邦姜何咏琪陈章渊
Owner PEKING UNIV
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