Patent ID: 7450854

Claim:
A high-speed wireless LAN system comprising: a mobile station, at least one associated access point and a gateway, said at least one access point and gateway connected by at least one optical fiber; the mobile station for: transmitting and receiving a data signal encrypted by a predetermined encryption method; communicating the encrypted data signal by an ultra wide-band (UWB) communication method; and communicating an encryption key signal according to the encryption method by an optical communication method; the at least one associated access point, installed in a plurality of predetermined service areas, for: receiving said encrypted data signal and encryption key; relaying via an optical fiber communication method the encrypted data signal and the encryption key signal, said access point comprising: a WDM for multiplexing/de-multiplexing the data signal and the encryption key signal transmitted/received through the gateway sub-module and the optical fiber; a semiconductor optical amplifier (SOA) for converting an optical signal corresponding to the data, which is received from the gateway sub-module through the WDM, into a current signal to transmit by wireless the current signal through the UWB antenna, and outputting an optical signal with its gain amplified according to the data signal received through the UWB antenna to transmit the optical signal to the gateway through the WDM; a controller for providing a current to said SOA, wherein in one communication direction the controller provides a current to less than a threshold current while in an opposite communication direction applying a current more than a threshold current; and an IR optical antenna for transmitting the encryption key signal received through the WDM to the mobile station as an IR signal, receiving the encryption key signal transmitted from the mobile station, and transmitting the received encryption key signal to the gateway through the WDM; and the gateway, located at a remote place by providing an optical interface between an internal network and an external network, comprising: a plurality of gateway sub-modules for transmitting/receiving the encrypted data signal and the encryption key signal via said optical communication method, and transmitting a subscriber service transmitted from the external network to the corresponding access point, said gateway sub-modules comprising: a 2-channel array optical transmitter/receiver module for transmitting/receiving the encryption key signal through the IR method and the data signal through the UWB method by channels having different center wavelengths; and a wavelength division multiplexer (WDM) for multiplexing/de-multiplexing the encryption key signal and the data signal.