An optical add/drop multiplexer apparatus (100, 200), wherein the optical add/drop multiplexer apparatus is an integrated optical chip, and the optical add/drop multiplexer apparatus comprises an input port (103, 201, 317, 525), an output port (104, 202, 318, 526), an add port (105, 203, 320, 521, 523) and/or a drop port (106, 204, 319, 522, 524), a filter unit (101, 205), and a waveband multiplexer/demultiplexer unit, wherein the filter unit (101, 205) comprises a plurality of microring filters, the filter unit (101, 205) is connected to the waveband multiplexer/demultiplexer unit, and the waveband multiplexer/demultiplexer unit is separately connected to the input port (103, 201, 317, 525), the output port (104, 202, 318, 526), the add port (105, 203, 320, 521, 523), if present, and the drop port (106, 204, 319, 522, 524), if present; the waveband multiplexer/demultiplexer unit is configured to input, based on wavelength of one or more input optical signals, the one or more input optical signals into a microring filter corresponding to a band to which the one or more input optical signals belong, wherein one band corresponds to at least one microring filter, each microring filter has a different resonance wavelength, and the one or more input optical signals comprise an optical signal at the input port (103, 201, 317, 525) and/or the add port (105, 203, 320, 521, 523), if present; the filter unit (101, 205) is configured to couple a target optical signal from the input port (103, 201, 317, 525) to the drop port (106, 204, 319, 522, 524), if present, and/or to couple a target optical signal from the add port (105, 203, 320, 521, 523), if present, to the output port (104, 202, 318, 526), wherein the target optical signal is an optical signal, whose wavelength is equal to a resonance wavelength of the microring filter, in the input optical signal; and the waveband multiplexer/demultiplexer unit is further configured to output the target optical signal coupled to the output port (104, 202, 318, 526) and/or the drop port (106, 204, 319, 522, 524), if present. the filter unit (101, 205) comprises a plurality of microring filters, the filter unit (101, 205) is connected to the waveband multiplexer/demultiplexer unit, and the waveband multiplexer/demultiplexer unit is separately connected to the input port (103, 201, 317, 525), the output port (104, 202, 318, 526), the add port (105, 203, 320, 521, 523), if present, and the drop port (106, 204, 319, 522, 524), if present; the waveband multiplexer/demultiplexer unit is configured to input, based on wavelength of one or more input optical signals, the one or more input optical signals into a microring filter corresponding to a band to which the one or more input optical signals belong, wherein one band corresponds to at least one microring filter, each microring filter has a different resonance wavelength, and the one or more input optical signals comprise an optical signal at the input port (103, 201, 317, 525) and/or the add port (105, 203, 320, 521, 523), if present; the filter unit (101, 205) is configured to couple a target optical signal from the input port (103, 201, 317, 525) to the drop port (106, 204, 319, 522, 524), if present, and/or to couple a target optical signal from the add port (105, 203, 320, 521, 523), if present, to the output port (104, 202, 318, 526), wherein the target optical signal is an optical signal, whose wavelength is equal to a resonance wavelength of the microring filter, in the input optical signal; and the waveband multiplexer/demultiplexer unit is further configured to output the target optical signal coupled to the output port (104, 202, 318, 526) and/or the drop port (106, 204, 319, 522, 524), if present.