Abstract: An optical system affixed to an electronic apparatus is provided, including a first optical module, a second optical module, and a third optical module. The first optical module is configured to adjust the moving direction of a first light from a first moving direction to a second moving direction, wherein the first moving direction is not parallel to the second moving direction. The second optical module is configured to receive the first light moving in the second moving direction. The first light reaches the third optical module via the first optical module and the second optical module in sequence. The third optical module includes a first photoelectric converter configured to transform the first light into a first image signal.

Abstract: A communication method is suitable for use in a network architecture including using a software defined network (SDN) protocol and a legacy network protocol, and includes the following steps. A first sub-domain manage unit of a first SDN sub-domain receives a connection request message corresponding to a multicast source from a client. The first sub-domain manage unit transmits a join request message to a main router of a legacy network domain connected to the first SDN sub-domain when determining that the multicast source is not in the first SDN sub-domain. The first sub-domain manage unit transmits the connection request message to a first domain manage unit of a first SDN domain when the main router determines that the multicast source is not in the legacy network domain. A communication path is established between the client and the multicast source when a location of the multicast source is obtained.

Abstract: A communication method is suitable for use in a network architecture including using a software defined network (SDN) protocol and a legacy network protocol, and includes the following steps. A first sub-domain manage unit of a first SDN sub-domain receives a connection request message corresponding to a multicast source from a client. The first sub-domain manage unit transmits a join request message to a main router of a legacy network domain connected to the first SDN sub-domain when determining that the multicast source is not in the first SDN sub-domain. The first sub-domain manage unit transmits the connection request message to a first domain manage unit of a first SDN domain when the main router determines that the multicast source is not in the legacy network domain. A communication path is established between the client and the multicast source when a location of the multicast source is obtained.