Fusion system of radio over fiber (ROF) and wavelength division multiplexing passive optical network (WDM - PON), and signal transmission method of the same

Abstract

The invention discloses a fusion system of the radio over fiber (ROF) and the wavelength division multiplexing passive optical network (WDM - PON), and a signal transmission method of the same. According to the system, two sets of WDM - PON transmitter-receiver devices are arranged in a central office (CO), and on a remote node (RN), a cross multiplexing structure is arranged between two sets of WDM - PON optical fibers, and two optical network unit (ONU) receiving devices are correspondingly arranged at an ONUs receiving end. The signal transmission method comprises the steps of: downlink transmitting modules 1 - 16 transmit signals, and the signals enter a main optical fiber through a wavelength division multiplexing device and a circulator; on the RN, the signals enter receiving devices ONU 1 - ONU 16 correspondingly through a coupler (CP) 1, an opto-isolator, a CP 4 and a wavelength division demultiplexing device; and in the ONUs receiving end, the receiving devices ONU 1 - ONU 16 receive signals and modulate uplink signals and transmit the modulated uplink signals to uplink receiving modules 1 - 16 through the CP 4, the opto-isolator, a CP 3 and the main optical fiber correspondingly for uplink signal demodulation. According to the fusion system of the ROF and the WDM - PON, and the signal transmission method of the same, uplink transmission and downlink transmission of millimeter wave signals and baseband signals are enabled to be achieved at the same time, and backward rayleigh scattering of a single-fiber two-way transmission system is effectively avoided.

Description

Technical field [0001] The invention relates to the fields of optical communication technology and radio frequency communication technology, in particular to a ROF and WDM-PON fusion system and a signal transmission method thereof. Background technique [0002] Radio over Optical (ROF) technology is a physical layer realization technology that integrates optical fiber and wireless. Wireless communication is highly flexible, enabling people to communicate with anyone anytime and anywhere, while broadband communications such as optical fiber access networks can transmit data, voice, video, and multimedia applications to business users and homes. Driven by the broadbandization and wirelessization of information systems in the future, the integration of optical fiber communication technology and wireless communication technology that can carry high-speed data transmission services is an inevitable trend. [0003] The multi-wavelength passive optical network (WDM-PON) technology based ...

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Problems solved by technology

[0004] In the prior art, the ROF and WDM-PON fusion systems are based on a set of WDM-PON transceiver devices, and the uplink transmission is basically the baseband signal. This system cannot transmit millimeter wave signals and baseband signals simultaneously in the uplink and downlink. Backward Rayleigh Scattering in Optical Fiber Bidirectional Transmission System

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