Device and method for transmitting and receiving service data in wavelength division multiplexing passive optical network

Abstract

The invention discloses a device and a method for transmitting and receiving business data in wavelength division multiplexing PON, which comprises a broad band optical source, a first modulator, a first array waveguide grating, a plurality of second modulators and a second array waveguide grating which are connected in sequence, wherein the first array waveguide grating comprises a plurality of output ends, each output end is connected with the input end of one second modulator, the second array waveguide grating comprises a plurality of input ends, and each input end is connected with the output end of one second modulator. In the invention, broadcast signals and unicast signals can be transmitted at the same wavelength, the wavelength use rate is high, and each bit can be guaranteed to have optical energy at all times, so that the device is free of limitation of ascending transmission rate; and the efficiency of spectrum can be doubled by means of a number of simple modulators and demodulating devices; and each optical network unit saves one optical transmitter, and can conduct remodulation on descending signals which are taken as ascending signal sources.

Description

technical field [0001] The invention relates to the technical field of optical network information transmission, in particular to a device and method for transmitting and receiving service data in a wavelength division multiplexing passive optical network. Background technique [0002] Due to the different technologies of the three major access networks of traditional telecommunication network, computer Internet and cable television network, although it is the general trend to realize the integration of three networks based on FTTH (fiber-to-the-home) for the optical fiber access network, the transmission of image services The huge bandwidth occupied and the high Qos (quality of service) required are difficult problems for digital optical access technology. difficult to integrate. In order to enable users to enjoy the above-mentioned triple services at the same time, the general practice is: the analog cable TV (CATV) service and the data and voice services based on digital...

AI Technical Summary

Problems solved by technology

[0009] At present, the transmission of broadcast signals (for example, cable TV signals) in PON is from the OLT end to the ONU end using a single wavelength broadcast form, but there is no mature technology for transmitting broadcast signals in WDM-PON

With the strong demand for broadband services of video, voice and data services, some literatures propose to add a wavelength to transmit broadcast signals, but this method has the following disadvantages: First, an additional modulator is required to modulate broadcast signals ; The second is that an additional wavelength needs to be added to transmit broadcast signals, which increases the cost of the system. There are also literatures that use time-division multiplexing to support simultaneous transmission of point-to-point signals and broadcast signals. This method increases the time control. Difficulty, and the bandwidth of a single channel is sacrificed. In addition, it is also mentioned that the use of inverted return-to-zero code modulation is used to transmit broadcast signals. Although this method has no impact on the data transmission of a single channel, it is provided by the service provider. Designated users provide broadcast services, but require high-speed logic circuits to generate signals

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