METHOD FOR MONITORING WAVELENGTH OF TURNABLE LASER DEVICE OF CLIENT BY MEANS OF LOCAL SIDE OPTICAL LINE TERMINAL

摘要

Disclosed is a method for monitoring the wavelength of a turnable laser device of a client by means of a local side optical line terminal. The method is applied to a wavelength division multiplexing passive optical network framework. The framework comprises an optical network unit (ONU) (1), a first athermal array waveguide grating (3), a transmission optical fiber (5), a second athermal array waveguide grating (4) and the optical line terminal (2), which are sequentially connected. The optical network unit (1) comprises turnable wavelength optical transmitters (1-3). The method comprises the following steps that starting handshaking is carried out between the optical line terminal (2) and the optical network unit (1); and the optical line terminal (2) carries out wavelength drifting monitoring during operation of the optical network unit (1). By adopting the method, wavelength adjustment can be carried out on the multi-channel turnable laser device in an external auxiliary monitoring environment, thus channel wavelengths of the multi-channel turnable laser device can be accurately controlled, and the requirement for calibration accuracy of channels of the turnable laser device at the ONU is greatly reduced.