The present disclosure provides a method for providing a white box transponder (132). The method includes a step of receiving the plurality of user inputs (104) from an orchestrator (102) at a programmable photonic switch mode system (108). The method includes another step of receiving the real-time data from an optical line system (122). The method includes yet another step of computing a run-time mode of operation based on the plurality of user inputs (104), the real-time data from the optical line system (122), a complete path computation information, and the network dimensioning data with facilitation of the programmable photonic switch mode application (110). The complete path computation information is received from a path computation engine (120). The method includes yet another step of sending the computed run-time mode of operation to the white box transponder (132) for dynamically configuring the white box transponder (132).

A signal processing device includes a first photoelectric conversion module and a second photoelectric conversion module; the first photoelectric conversion module is configured to receive an optical signal to be sent that is sent by a time synchronization device, convert the optical signal to be sent into an electric signal to be sent, and transmit the electric signal to be sent to the second photoelectric conversion module, where the optical signal to be sent is generated by the time synchronization device according to an initial electrical signal, and the initial electrical signal includes a service signal and a time synchronization signal; and the second photoelectric conversion module is configured to convert the electrical signal to be sent into a first optical signal of a preset frequency, and send the first optical signal to a first optical path coupling device, causing the first optical path coupling device to couple the first optical signal to an optical signal transmission line for transmission.

A signal processing device includes a first photoelectric conversion module and a second photoelectric conversion module; the first photoelectric conversion module is configured to receive an optical signal to be sent that is sent by a time synchronization device, convert the optical signal to be sent into an electric signal to be sent, and transmit the electric signal to be sent to the second photoelectric conversion module, where the optical signal to be sent is generated by the time synchronization device according to an initial electrical signal, and the initial electrical signal includes a service signal and a time synchronization signal; and the second photoelectric conversion module is configured to convert the electrical signal to be sent into a first optical signal of a preset frequency, and send the first optical signal to a first optical path coupling device, causing the first optical path coupling device to couple the first optical signal to an optical signal transmission line for transmission.