An optical time domain reflectometer, OTDR, implementation apparatus, comprising: multiple transmitters, configured to transmit multiple optical waves of different wavelengths, wherein a downlink optical signal is loaded onto each of optical waves transmitted by the multiple transmitters, and the downlink optical signal is a high frequency signal; an OTDR detection circuit, configured to generate an OTDR detection signal; a processor, configured to select at least two optical waves of different wavelengths to load OTDR detection signals, wherein the OTDR detection signal is a low frequency signal; and multiple receivers, wherein a first receiver is connected to an egress link of the multiple transmitters, and is configured to: receive reflected signals of the at least two optical waves carrying the OTDR detection signals, and transmit the reflected signals to the OTDR detection circuit for OTDR detection, and other receivers are connected to a demultiplexer, and each are configured to receive multiple uplink signals; wherein the processor is specifically configured to: load an OTDR detection signal of a first frequency onto a first optical wave of the at least two optical waves; and, simultaneously, load an OTDR detection signal of a second frequency onto a second optical wave of the at least two optical waves, where the first frequency is different from the second frequency; and wherein the apparatus further comprises an electrical filter connected to the first receiver and adapted to extract the first and second low-frequency OTDR detection signals and to filter out the high frequency signals. multiple transmitters, configured to transmit multiple optical waves of different wavelengths, wherein a downlink optical signal is loaded onto each of optical waves transmitted by the multiple transmitters, and the downlink optical signal is a high frequency signal; an OTDR detection circuit, configured to generate an OTDR detection signal; a processor, configured to select at least two optical waves of different wavelengths to load OTDR detection signals, wherein the OTDR detection signal is a low frequency signal; and multiple receivers, wherein a first receiver is connected to an egress link of the multiple transmitters, and is configured to: receive reflected signals of the at least two optical waves carrying the OTDR detection signals, and transmit the reflected signals to the OTDR detection circuit for OTDR detection, and other receivers are connected to a demultiplexer, and each are configured to receive multiple uplink signals; wherein the processor is specifically configured to: load an OTDR detection signal of a first frequency onto a first optical wave of the at least two optical waves; and, simultaneously, load an OTDR detection signal of a second frequency onto a second optical wave of the at least two optical waves, where the first frequency is different from the second frequency; and wherein the apparatus further comprises an electrical filter connected to the first receiver and adapted to extract the first and second low-frequency OTDR detection signals and to filter out the high frequency signals. load an OTDR detection signal of a first frequency onto a first optical wave of the at least two optical waves; and, simultaneously, load an OTDR detection signal of a second frequency onto a second optical wave of the at least two optical waves, where the first frequency is different from the second frequency; and wherein the apparatus further comprises an electrical filter connected to the first receiver and adapted to extract the first and second low-frequency OTDR detection signals and to filter out the high frequency signals. <EOS>