Apparatus and cascading system for generating dummy optical signal

A cascading system, comprising:

• a plurality of dummy optical signal generation apparatuses;
• and
• a plurality of multiplexing apparatuses,
• wherein
• each dummy optical signal generation apparatus comprises:
• a multi-longitudinal mode laser configured to provide a light source signal;
• a comb optical bandpass filter;
• and
• a bandpass filter downstream of the comb optical bandpass filter,
• the light source signal provided by the multi-longitudinal mode laser of each dummy optical signal generation apparatus outputs a dummy optical signal through the comb optical bandpass filter of a same dummy optical signal generation apparatus, and the dummy optical signal is an optical signal that does not comprise service information,
• the bandpass filter is configured to receive the dummy optical signal output by the comb optical bandpass apparatus of the same dummy optical signal generation apparatus and obtain a dummy optical signal on a specific band from the dummy optical signal output by the multi-longitudinal mode laser through the comb optical bandpass filter of the same dummy optical signal generation apparatus,
• the plurality of multiplexing apparatuses comprises a first multiplexing apparatus, a second multiplexing apparatus, and a third multiplexing apparatus,
• the first multiplexing apparatus multiplexes the dummy optical signal on the specific band obtained by the bandpass filter of at least two dummy optical signal generation apparatuses of the plurality of dummy optical signal generation apparatuses to obtain a first multiplexed output,
• the second multiplexing apparatus multiplexes the dummy optical signal on the specific band obtained by the bandpass filter of at least two other dummy optical signal generation apparatuses of the plurality of dummy optical signal generation apparatuses different from dummy optical signal generation apparatuses of the plurality of dummy optical signal generation apparatuses having an output communicatively coupled with the first multiplexing apparatus to obtain a second multiplexed output, and
• the third multiplexing apparatus multiplexes the first multiplexed output and the second multiplexed output to obtain a third multiplexed output.

A network system, comprising:

• a first dummy optical signal generation apparatus comprising a first multi-longitudinal mode laser configured to provide a first light source signal, a first comb optical bandpass filter downstream of the first multi-longitudinal mode laser, and a first bandpass filter downstream of the first comb optical bandpass filter;
• a second dummy optical signal generation apparatus comprising a second multi-longitudinal mode laser configured to provide a second light source signal, a second comb optical bandpass filter downstream of the second multi-longitudinal mode laser, and a second bandpass filter downstream of the second comb optical bandpass filter;
• a third dummy optical signal generation apparatus comprising a third multi-longitudinal mode laser configured to provide a third light source signal, a third comb optical bandpass filter downstream of the third multi-longitudinal mode laser, and a third bandpass filter downstream of the third comb optical bandpass filter;
• a fourth dummy optical signal generation apparatus comprising a fourth multi-longitudinal mode laser configured to provide a fourth light source signal, a fourth comb optical bandpass filter downstream of the fourth multi-longitudinal mode laser, and a fourth bandpass filter downstream of the fourth comb optical bandpass filter;
• a first multiplexing apparatus;
• a second multiplexing apparatus;
• a third multiplexing apparatus;
• and
• an optical switch device,
• wherein
• the first bandpass filter is configured to obtain a first specific dummy optical signal in a first dummy optical signal received by way of the first comb optical bandpass filter,
• the second bandpass filter is configured to obtain a second specific dummy optical signal in a second dummy optical signal received by way of the second comb optical bandpass filter,
• the first multiplexing apparatus multiplexes the first specific dummy optical signal and the second specific dummy optical signal to obtain a first multiplexed output,
• the third bandpass filter is configured to obtain a third specific dummy optical signal in a third dummy optical signal received by way of the third comb optical bandpass filter,
• the fourth bandpass filter is configured to obtain a fourth specific dummy optical signal in a fourth dummy optical signal received by way of the fourth comb optical bandpass filter,
• the second multiplexing apparatus multiplexes the third specific dummy optical signal and the fourth specific dummy optical signal to obtain a second multiplexed output, and
• the third multiplexing apparatus multiplexes the first multiplexed output and the second multiplexed output to obtain a third multiplexed output, and outputs the third multiplexed output to the optical switch device.