Optical Add/Drop Multiplexer and Control Method Thereof, and Transceiver

A control method for an optical add/drop multiplexer, wherein the control method is applied to an optical add/drop multiplexer, the optical add/drop multiplexer comprises a plurality of tunable optical add/drop multiplexers (T-OADMs), the plurality of T-OADMs are connected one by one, each T-OADM comprises two wavelength control units and two grating-assisted filters (GAFs), a first wavelength control unit is connected to a first GAF, a second wavelength control unit is connected to a second GAF, a drop port of the first GAF is connected to an input port of the second GAF, and an add port of the first GAF is connected to an output port of the second GAF;

• and
• the control method comprises:
• receiving, by an input port of the first GAF of a first T-OADM, light waves of a plurality of wavelengths, wherein the light waves of the plurality of wavelengths comprise a first light wave;
• transmitting, by the first GAF, the first light wave to the input port of the second GAF through the drop port;
• changing, by the second wavelength control unit, a dropped spectrum of the second GAF based on target amplitude of wavelength shift, to obtain a first light wave response;
• and
• outputting, by a drop port of the second GAF, a first target light wave of a first target bandwidth, wherein the first target bandwidth is an overlapping spectral linewidth of the first light wave and the first light wave response.

A transceiver, comprising:

• at least one laser, at least one modulator, at least one detector, and an optical add/drop multiplexer, the optical add/drop multiplexer comprising a plurality of tunable optical add/drop multiplexers (T-OADMs), wherein the plurality of T-OADMs are connected one by one, each T-OADM comprises a second wavelength control unit and two grating-assisted filters (GAFs), and the second wavelength control unit is connected to a second GAF;
• a first GAF comprises an input port, an output port, a drop port, and an add port;
• the second GAF comprises an input port, an output port, a drop port, and an add port;
• the drop port of the first GAF is connected to the input port of the second GAF, and the add port of the first GAF is connected to the output port of the second GAF;
• the input port of the first GAF of a first T-OADM receives light waves of a plurality of wavelengths, wherein the light waves of the plurality of wavelengths comprise a first light wave;
• the first GAF transmits the first light wave to the input port of the second GAF through the drop port of the first GAF;
• the second wavelength control unit changes a dropped spectrum of the second GAF based on first amplitude of wavelength shift, to obtain a first light wave response;
• and
• the drop port of the second GAF outputs a first target light wave of a first target bandwidth, wherein the first target bandwidth is an overlapping spectral linewidth of the first light wave and the first light wave response;
• wherein the laser is connected to the modulator, the modulator is connected to an add port of the optical add/drop multiplexer, and the detector is connected to a drop port of the optical add/drop multiplexer.