Optical-layer module, access site, and optical signal processing method

An optical-layer module, used in a first access site, wherein the optical-layer module comprises:

• a fiber interface, a splitter, a wavelength blocker, and a multiplexer, wherein:
• the fiber interface is configured to receive a first optical signal from a second access site, wherein the first optical signal comprises an optical signal of at least one wavelength;
• the splitter is configured to:
• split the first optical signal into N+1 second optical signals, and send the N+1 second optical signals through N+1 output ports of the splitter, wherein one of the N+1 output ports of the splitter serves as a pass-through output port, and remaining N output ports serve as wavelength-drop ports;
• the multiplexer is configured to receive a third optical signal through a pass-through input port, wherein the third optical signal comprises an optical signal of at least one wavelength;
• the wavelength blocker is configured to:
• receive N fourth optical signals from N optical transform units (OTUs), wherein wavelengths of the N fourth optical signals are different, and when determining that the wavelengths of the N fourth optical signals are all different from the at least one wavelength of the optical signal in the third optical signal, send the N fourth optical signals to the multiplexer through N wavelength-add ports of the multiplexer;
• the multiplexer is further configured to combine, into a fifth optical signal, the N fourth optical signals received the N wavelength-add ports, and the third optical signal;
• and
• the fiber interface is further configured to send the fifth optical signal to the second access site.

An access site, comprising at least one optical-layer module, wherein the at least one optical-layer module comprises a fiber interface, a splitter, a wavelength blocker, and a multiplexer, and wherein:

• the fiber interface is configured to receive a first optical signal from a second access site, wherein the first optical signal comprises an optical signal of at least one wavelength;
• the splitter is configured to:
• split the first optical signal into N+1 second optical signals, and send the N+1 second optical signals through N+1 output ports of the splitter, wherein one of the N+1 output ports of the splitter serves as a pass-through output port, and remaining N output ports serve as wavelength-drop ports;
• the multiplexer is configured to receive a third optical signal through a pass-through input port, wherein the third optical signal comprises an optical signal of at least one wavelength;
• the wavelength blocker is configured to:
• receive N fourth optical signals from N optical transform units (OTUs), wherein wavelengths of the N fourth optical signals are different, and when determining that the wavelengths of the N fourth optical signals are all different from the at least one wavelength of the optical signal in the third optical signal, send the N fourth optical signals to the multiplexer through N wavelength-add ports of the multiplexer;
• the multiplexer is further configured to combine, into a fifth optical signal, the N fourth optical signals received the N wavelength-add ports, and the third optical signal;
• and
• the fiber interface is further configured to send the fifth optical signal to the second access site.