| 摘要 |
Disclosed is a method for tuning a wavelength of wavelength-variable optical network unit (ONU) at a time and wavelength division multi-passive optical network (TWDM-PON) including multiple operable channels. First, at a TWDM-PON where at least a first channel is being operated, after a second channel is added as another operating channel, an optical line terminal (OLT), which is providing service to the ONU requests an alteration to the second channel. The ONU which received the request determines whether any decline in the wavelength of the second channel has been recorded. After the determination, the ONU transmits a wavelength tuning allowance message, which bears a positive sign for the alteration of wavelength, to the OLT, and starts the alteration of the wavelength to the second channel, or transmits a wavelength tuning denial message, which bears a negative sign for the alteration of wavelength, to the OLT. |
