Communication network with secure access for portable users

A communication network, comprising:

• a local area network (LAN);
• one or more wireless network access points coupled to the LAN, wherein a given network access point includes:
• a medium access control (MAC) stage;
• a radio frequency (RF) transmitter/receiver arranged for transmitting and receiving RF signals to and from associated wireless devices, and for enabling users of the wireless devices to gain access to the LAN by way of RF links with the access point;
• an optical transmitter/receiver arranged for transmitting and receiving light signals to and from the wireless devices, and for enabling users of the wireless devices to gain access to the LAN through free space optical (FSO) links with the access point;
• the MAC stage is configured (i) to direct unsecure first voice data originating from the LAN to users of the wireless devices, and to direct unsecure second voice data received from the users of the wireless devices to the LAN, by way of the RF transmitter/receiver;
• and (ii) to direct secure third voice data originating from the LAN to users of the wireless devices, and to direct secure fourth voice data received from the users of the wireless devices to the LAN, by way of the optical transmitter/receiver;
• and
• an optical access antenna system coupled to the optical transmitter/receiver of the network access point, wherein at least a part of the antenna system is arranged to be within an optical range of one or more users of the wireless devices;
• a decrypto processor having an input coupled to the MAC stage and an output coupled to the optical transmitter/receiver, and the decrypto processor is configured to decode encrypted secure third voice data received from the LAN and destined to the users of the wireless devices, and to produce corresponding decrypted secure third voice data at the output of the processor;
• a crypto device having an output coupled to the MAC stage and operative to encrypt unencrypted secure fourth voice data received at an input of the device from users of the wireless devices and destined to the LAN, and to supply the encrypted secure fourth voice data to the MAC stage of the access point;
• and
• one or more wireless handsets constituting the wireless devices, wherein each handset includes:
• a source of unencrypted voice data;
• a radio frequency (RF) transceiver constructed and arranged for transmitting RF signals corresponding to unsecure second voice data from the voice data source to at least one of the network access points, and for receiving RF signals corresponding to unsecure first voice data from the access point;
• an optical transceiver for transmitting free space optical (FSO) signals corresponding to secure fourth voice data from the voice data source to the optical access antenna system, and for receiving FSO signals corresponding to secure decrypted third voice data from the optical access antenna system;
• and
• a switching stage having a first port coupled to the source of voice data, a second port coupled to the RF transceiver, and a third port coupled to the optical transceiver, wherein the switching stage is configured to couple the source of voice data to a selected one of the RF transceiver for transmission of the unsecure second voice data, and the optical transceiver for transmission of the secure fourth voice data.