KR100237471B1 - A receiver wdm network - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver in a network interface unit of a wavelength division multiplexed communication network. The present invention relates to a wavelength variable optical filter and a filter for filtering a signal of any wavelength from among data signals received using the wavelength variable optical filter. And at least two single wavelength receiving units comprising a mixer and a photodetector for detecting the filtered data signal.

This method can receive data signals of multiple wavelengths simultaneously at each node of the wavelength division multiplexing network, thereby reducing the reception collision of non-uniform traffic and increasing the efficiency of the entire network.

Description

A receiver for wavelength division multiplexing network

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver of a wavelength division multiplexed communication network, and in particular, a broadcast and select network having a single control channel-multiple data channel (hereinafter referred to as SCMD) scheme. In order to improve reception efficiency by reducing reception collisions of nonuniform traffic occurring in a Wavelength Division Multiplexing Network (hereinafter, referred to as a WDM communication network), a single wavelength band signal is used. The present invention relates to a receiver of a wavelength division multiplexing communication network comprising at least two single wavelength receiving units capable of receiving the signal.

1 is a schematic configuration diagram of a WSN communication network having a BSN structure having an SCMD scheme, and includes a node 121 representing an end of a communication network such as a computer terminal, a network connection device 122 connecting a node and a communication network, and a control signal. It consists of a centralized controller 100 in charge of the processing of the molded coupler 110 and the data signals connected.

When the node 121 transmits, it sends data to the molding coupler 110 and at the same time sends a control signal to the centralized controller 100. When receiving, the node 121 receives data from the molding coupler 110 and concentrates at the same time. A control signal is received from the type controller 100. At this time, the device in charge of data transmission and reception is a network connection device (NIU) 122, and a data signal of a wavelength allocated to each node through a fixed frequency laser ( λ1, λ2, ⃛, λn ) Is a transmission device for transmitting to the molding coupler 110 and a receiving device for receiving a data signal from the molding coupler 110.

Conventionally, one wavelength variable filter is used for the receiver of the network connection device 122, and one wavelength variable filter can be tuned to only one wavelength at a time. Only one signal of the data signals of the wavelength can be received at a time. However, since the molded coupler 110 mixes data signals of various wavelengths, which are individually input together, and transmits them to each node that needs to be received, when multiple nodes simultaneously request service to one node, the transmitted data signal is one. Not multiple wavelengths ( λ1 + λ2 + ⃛ + λn You can have both at the same time.

FIG. 3 is a state diagram illustrating a reception collision state for non-uniform traffic when each node (nodes 1 to 8) receives data using only one wavelength variable optical filter. FIG. Node 1 (311) λ1 Transmits data having a wavelength of 2, and the node 2 312 λ2 When transmitting data having a wavelength of, the molded coupler 330 mixes the two signals ( λ1 + λ2 ) If each node involved in the reception is a node 5 (321) and a node 7 (323), these two nodes can receive only one wavelength signal at a time. There was a problem that the performance of the entire communication network is degraded due to reception conflicts.

Accordingly, the present invention has been made to solve the above problems, wavelength division multiplexing comprising two or more single wavelength reception unit capable of receiving a single wavelength band signal to receive a plurality of wavelengths at the same time Its purpose is to provide a receiving device of a communication network.

In order to achieve the above object, a receiver of a wavelength division multiplexing communication network according to the present invention includes a variable wavelength optical filter; A mixer for filtering a signal of any one wavelength among data signals received using the variable wavelength optical filter; And at least two single wavelength receiving units comprising a photodetector for detecting the filtered data signal.

1 is a schematic configuration diagram of a WDM communication network having a BSN structure having an SCMD scheme;

2 is a detailed configuration diagram of a network connection device;

3 is a state diagram illustrating a reception collision state for non-uniform traffic.

* Explanation of symbols for main parts of the drawings

100: Central Controller 110: N x N Molded Coupler

122,240: network interface unit (NIU)

220: transmission device of the network connection device

221: Fixed Frequency Laser

222: header processor

230: receiver of the network connection device

231: Tunable Optical Filter

232: Photodetector

233: Mixer for filtering a specific channel of the data channel using the tuning signal

234: Electronic Interface

235: Optical Interface

236: single wavelength reception unit

FIG. 2 is a detailed configuration diagram of the network connection device 240. The header processor 222 serves to copy and transmit the control information received from the processor 210 of the node to the centralized controller 100, and to each node. Transmitting device 220 consisting of a fixed frequency laser 221 for generating a data signal having an assigned wavelength and receiving device 230 for receiving signals from the molded coupler 110 and the centralized controller 100 It consists of.

The receiver 230 of the network connection device 240 according to the present invention includes a wavelength tunable optical filter 231 and a mixer 233 for filtering a signal having an arbitrary wavelength among data signals received using the tunable optical filter. ) And two or more single wavelength reception units 236, which are composed of photodetectors 232 that detect the filtered data signal and send them to the processor 210 of the node, are connected in parallel. Are connected to each other by the electrical connection 234 or the optical connection 235 according to the characteristics of the transmission path and the transmission path connected thereto. In addition, the data signal coming from the shaping coupler 110 and the tuning signal coming from the centralized controller 100 are input in parallel to each single wavelength receiving unit 236.

Since the data signal from the shaping coupler 110 is simultaneously input to each single wavelength receiving unit 236 in parallel, the L single wavelength receiving unit 236 can simultaneously receive signals of L different wavelengths at the same time. In non-uniform traffic where traffic is concentrated to one node, such as requesting a service from one node to one node, the network connection device 240 of the traffic-intensive node may select L single wavelength reception units 236. If so, the node can simultaneously receive signals with L different wavelengths, thus improving the reception efficiency of this node.

According to the present invention, when data signals including two or more wavelengths are concentrated in one node, the number of data signals that can be received at the same time increases, thereby reducing the reception collision caused by non-uniform traffic and thus receiving the entire communication network. The efficiency can be increased.

Claims (1)

Wavelength tunable optical filter 231; A mixer 233 for filtering a signal having any wavelength from among data signals received using the variable wavelength optical filter; And And at least two single wavelength receiving units (236) composed of photodetectors (232) for detecting filtered data signals.

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