Wavelength locking optical module, device, and wavelength locking method

A wavelength locking device, characterized in comprising a first optical module and a second optical module, the first optical module comprising a first DSP (digital signal processing) unit, a first TOSA (transmitter optical subassembly), and a first ROSA (receiver optical subassembly), a signal output end of the first DSP unit being connected to the first TOSA, and a signal input end being connected to the first ROSA;

• and the second optical module comprising a second DSP unit, a second TOSA, and a second ROSA, a signal output end of the second DSP unit being connected to the second TOSA, a signal input end being connected to the second ROSA;
• a signal output end of the first TOSA being connected to a signal input end of the second ROSA, and a signal output end of the second TOSA being connected to a signal input end of the first ROSA;
• wherein the first TOSA is provided with a first TEC (thermoelectric cooler) therein, and the second ROSA is provided with a second optical filter therein;
• after an optical signal output by the first TOSA enters the second ROSA, the second optical filter filters the optical signal, such that light of a preset wavelength is converted into an electrical signal and then output to the second DSP unit;
• the second DSP unit calculates optical power, and generates and transmits an encoded signal containing a wavelength adjustment direction according to a change in the optical power, to the second TOSA;
• the second TOSA converts the encoded signal into an optical signal and sends it to the first ROSA;
• the first ROSA converts the optical signal into an encoded signal and transmits it to the first DSP unit;
• and the first DSP unit transmits a control signal to the first TEC according to the encoded signal, and then adjusts a temperature of the first TEC to make an emission wavelength of the first TOSA to be a preset wavelength.

A wavelength locking method, characterized in that a mutual adjustment of wavelengths is achieved by a first optical module and a second optical module, and when an emission wavelength of the first optical module needs to be locked to a preset wavelength, the wavelength locking method comprises:

• filtering, by a second optical filter, an optical signal output by a first TOSA (transmitter optical subassembly) after entering a second ROSA (receiver optical subassembly), such that light of the preset wavelength is converted into an electrical signal and then output to a second DSP (digital signal processing) unit after passing through;
• calculating detected optical power according to the received electrical signal and transmitting an encoded signal containing wavelength adjustment to a second TOSA according to a change of the optical power by means of the second DSP unit, and then converting the encoded signal into an optical signal to transmit to the first ROSA by means of the second TOSA;
• converting the optical signal into an encoded signal and transmitting it to the first DSP unit by the first ROSA, and by the first DSP unit, emitting a control signal to a first TEC (thermoelectric cooler) according to the encoded signal, and then adjusting the emission wavelength of the first TOSA through temperature adjustment;
• wherein when the detected optical power in the second ROSA reaches a maximum value, the emission wavelength of the first TOSA reaches the preset wavelength, and wavelength locking of the first optical module is realized.