A system providing fault tolerance in a Passive Optical Network "PON", the system comprising: at least one Optical Line Terminal "OLT" arranged to receive multiple services and generate optical signals during a down linking and further arranged to receive optical signals and generate electrical signals during an up linking; a first optical transceiver coupled to the at least one OLT, the first optical transceiver arranged to receive the optical signals and transmit the optical signals by way of a Free Space Optics "FSO" link; a second optical transceiver, including a receiver that communicates with the first optical transceiver, arranged to receive the optical signals by way of the FSO link and output the optical signals, wherein the FSO link comprises a first modulator and a second modulator; at least one Optical Network Terminal "ONT", coupled to the second optical transceiver, that receives the optical signals and generates the electrical signals during the down linking and receives the electrical signals and generates the optical signals during the up linking; the first modulator, connected between the at least one OLT and the first optical transceiver, the first modulator arranged to receive and convert the optical signals in a burst mode to the optical signals in a continuous mode during the up linking of the optical signals; and the second modulator, connected between the at least one ONT and the second optical transceiver, the second modulator arranged to receive and convert the optical signals in the burst mode to the optical signals in the continuous mode during the down linking, whereby the first and second optical transceivers transmit the optical signals in the continuous mode by way of the FSO link, wherein the at least one FSO link, configured to operate in a continuous mode during uplinking and downlinking, provides the fault tolerance in the PON. at least one Optical Line Terminal "OLT" arranged to receive multiple services and generate optical signals during a down linking and further arranged to receive optical signals and generate electrical signals during an up linking; a first optical transceiver coupled to the at least one OLT, the first optical transceiver arranged to receive the optical signals and transmit the optical signals by way of a Free Space Optics "FSO" link; a second optical transceiver, including a receiver that communicates with the first optical transceiver, arranged to receive the optical signals by way of the FSO link and output the optical signals, wherein the FSO link comprises a first modulator and a second modulator; at least one Optical Network Terminal "ONT", coupled to the second optical transceiver, that receives the optical signals and generates the electrical signals during the down linking and receives the electrical signals and generates the optical signals during the up linking; the first modulator, connected between the at least one OLT and the first optical transceiver, the first modulator arranged to receive and convert the optical signals in a burst mode to the optical signals in a continuous mode during the up linking of the optical signals; and the second modulator, connected between the at least one ONT and the second optical transceiver, the second modulator arranged to receive and convert the optical signals in the burst mode to the optical signals in the continuous mode during the down linking, whereby the first and second optical transceivers transmit the optical signals in the continuous mode by way of the FSO link, wherein the at least one FSO link, configured to operate in a continuous mode during uplinking and downlinking, provides the fault tolerance in the PON.