The advantages of Optical Packet Switching (OPS) are transparent data transmission and data format, flexible packet
control and dynamic resource allocation. It thus can support high-speed transmission of wideband data networks. Unlike
Optical Burst Switching (OBS) systems which need reserved channel to transmit destination address, an advanced OPS
solution using Optical Orthogonal Code (OOC) label for payload transfer has been proposed in this paper. Different from
other OPS systems, our edge nodes are required to realize some special tasks including extracting destination addresses
of the received IP packet which is used as payload in our OPS systems and sending the addresses to the OOC label
generator. The OOC label will later be used to identify the destination of each payload at the core node for optical
switching. Meanwhile, the higher-priority flow can be prior-serviced according to the Type of Service (TOS) in the head
of IP packet. It is experimentally shown that the edge nodes in this OPS system can effectively improve the efficiency of
packet switching and the speed of data transmission.
The edge node implementation contains two parts: the hardware and software. For the hardware part, all necessary
modules have been integrated onto one PCB board, thus avoiding possible instability caused by interconnecting different
modules like transmitting/receiving Ethernet frame module, Field Programmable Gate Array (FPGA) processing module
and optical transceiver module etc. from different Printed Circuit Boards (PCB). For the software part, the whole of
system was based on MicroC/OS-II operating systems running on the Nios II soft core processor. It is verified by the
experiment that embedded system designed with Nios II soft core CPU can help to speed up the hardware design. With
the SOPC Builder's development environment, more attention can be paid to the structure and function of the system
without worrying about the details of the circuit design, and better performance on system stability and reliability could
be achieved at the same time.
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