Patent ID: 8655171

Claim:
An optical power budget method in a passive optical network, comprising: an optical power budget device selecting at least one group of an optical transmitter and an optical receiver from a set of optical transmitters with a power range of 4-18 dBm and a set of optical receivers with a working range of sensitivity of −20-−34 dBm to meet a requirement that a result of the minimum transmission power of the selected optical transmitter minus the maximum sensitivity of the selected optical receiver is more than or equal to a minimum optical link loss, wherein the minimum optical link loss is acquired according to a transmission requirement of the passive optical network with a splitting ratio 1:2 N in which N≧7 or a long distance which is more than or equal to 40 km; wherein, when the minimum optical link loss is 39 dB, a combination of a 12 dBm DFB optical transmitter and a −28 dBm APD optical receiver is selected; when the minimum optical link loss is 35 dB, a combination of a 9 dBm DFB optical transmitter and a −27 dBm APD optical receiver is selected, and/or a combination of a 6 dBm DFB optical transmitter and a −30 dBm APD optical receiver is selected; when the minimum optical link loss is 33 dB, a combination of a 5 dBm DFB optical transmitter and a −29 dBm APD optical receiver is selected; when the minimum optical link loss is 31 dB, a combination of a 10.5 dBm DFB optical transmitter and a −21.5 dBm optical receiver is selected, and/or a combination of the 4 dBm DFB optical transmitter and a −28 dBm APD optical receiver is selected; wherein, the at least one group of the selected optical transmitter and the selected optical receiver is acted as a combination of an optical transmitter of an Optical Line Terminal (OLT) and an optical receiver of an Optical Network Unit (ONU) in a downstream optical link and a combination of an optical receiver of the OLT and an optical transmitter of the ONU in an upstream optical link.