Optical device with switch function for adding or blending filter

摘要

The device has a waveguide filter (103) to switch an input optical signal with at least one specific wavelength, which is to be transmitted or reflected. The device has a first circulator (101). This has an input terminal (106) to input the light signal to the wavelength filter (103). It also has a mixing terminal (107) to output the reflected light signal. A second circulator (102) has an output terminal (110) to output the transmitted light signal, and has an adding terminal (112) to input an added light signal of the predetermined wavelength. The waveguide filter may be coupled in series with a waveguide filter on a single substrate (114), and arranged between the first and second circulators (101,102). The device may have an input waveguide and an output waveguide forming a 3 dB coupler.