Optical module, data center system, and data transmission method

A data center system, comprising:

• a convergence layer switching device group comprising an optical switching device and N electrical switching devices, wherein Nis an integer greater than 0;
• an access layer switching device group comprising a first device, the first device comprising:
• N+1 downlink ports comprising:
• a first downlink port connected to the optical switching device, and
• N second downlink ports, each of the N second downlink ports connected to one of the N electrical switching devices;
• and
• an optical module comprising:
• the first downlink port;
• a second downlink port being one of the N second downlink ports;
• a first directional coupler connected to the first downlink port and configured to receive a first downlink optical signal sent by the optical switching device;
• a second PD connected to the first directional coupler and configured to obtain a first power value;
• a first optical attenuator configured to attenuate, if the first power value is greater than a first threshold, based on a first attenuation control signal, a power of an optical signal passing through the second downlink port;
• and
• a first photodiode PD configured to convert the first downlink optical signal into a first downlink electrical signal, and if the first power value is less than or equal to the first threshold, further configured to convert the optical signal passing through the second downlink port into an electrical signal;
• a second optical attenuator;
• and
• a third PD connected to a second directional coupler and configured to obtain a third power value;
• and
• if the third power value is greater than a third threshold, the second optical attenuator is configured to:
• receive a second attenuation control signal, and attenuate a power of the first downlink optical signal based on the second attenuation control signal.

A data transmission method, comprising:

• receiving a first downlink optical signal passing through a first downlink port;
• detecting a power of an optical signal obtained through coupling from the first downlink optical signal, to obtain a first power value;
• and
• in repose to the first power value is greater than a first threshold, attenuating a power of an optical signal passing through a second downlink port, and
• converting the first downlink optical signal into a first downlink electrical signal;
• or
• in response to the first power value is less than or equal to a first threshold, receiving an optical signal passing through a second downlink port, and
• converting the optical signal passing through the second downlink port into an electrical signal.