A method for implementing a cascaded optical splitter, wherein the cascaded optical splitter includes multiple splitting units, wherein the multiple splitting units are cascaded, and at least one of the splitting units is a wavelength-sensitive optical splitter including a first branch optical fiber P1 configured to output at least one first optical signal having at least one first wavelength or waveband, and a second branch optical fiber P2 configured to output at least one second optical signal having at least one second wavelength or waveband; the method comprises: performing by the cascaded optical splitter, optical guiding or optical splitting on optical signals according to wavelengths or wavebands of the optical signals, wherein the cascaded optical splitter is a 1:2 N optical splitter; and a value interval of an optical splitting level K of the cascaded optical splitter is [1, N+1], N is a natural number and N is greater than 1, and each optical splitting level K corresponds to one or more splitting units, wherein the multiple splitting units further comprise: another optical splitting device, wherein the other optical splitting device comprises: an ordinary optical splitter and a point-to-point, P2P, optical splitter; performing by the wavelength-sensitive optical splitter optical guiding or optical splitting on the wavelengths or wavebands of the optical signals; wherein the ordinary optical splitter is in signal communication with the second branch optical fiber P2 and configured to equally distribute the at least one second optical signal according to optical power, and wherein the P2P optical splitter is in signal communication with the first branch optical fiber P1 and configured to uniformly divide a wavelength or waveband of the at least one first optical signal and perform P2P transparent transmission on the optical signals by coupling specified wavelengths or wavebands of the at least one first optical signal to a corresponding output of the P2P optical splitter. performing by the cascaded optical splitter, optical guiding or optical splitting on optical signals according to wavelengths or wavebands of the optical signals, wherein the cascaded optical splitter is a 1:2 N optical splitter; and a value interval of an optical splitting level K of the cascaded optical splitter is [1, N+1], N is a natural number and N is greater than 1, and each optical splitting level K corresponds to one or more splitting units, wherein the multiple splitting units further comprise: another optical splitting device, wherein the other optical splitting device comprises: an ordinary optical splitter and a point-to-point, P2P, optical splitter; performing by the wavelength-sensitive optical splitter optical guiding or optical splitting on the wavelengths or wavebands of the optical signals; wherein the ordinary optical splitter is in signal communication with the second branch optical fiber P2 and configured to equally distribute the at least one second optical signal according to optical power, and wherein the P2P optical splitter is in signal communication with the first branch optical fiber P1 and configured to uniformly divide a wavelength or waveband of the at least one first optical signal and perform P2P transparent transmission on the optical signals by coupling specified wavelengths or wavebands of the at least one first optical signal to a corresponding output of the P2P optical splitter.