Wavelength router with feedback control comprising optical monitor ports

A method of configuring an optical waveguide router device to have a feedback control, comprising:

• configuring an optical waveguide router with an input port and at least one output data port and at least one output monitor port such that each of said at least one data port and said at least one monitor port outputting a different portion of an optical data signal input to said input port;
• converting, in a monitoring circuit, an output of said at least one output monitor port to an electrical signal;
• comparing, in a comparing circuit, the electrical signal converted from the output of said at least one output monitoring port against 1) a reference signal, or 2) an electrical signal representing at least one output from another output monitoring port, wherein one of the frequencies of the outputs of the output monitoring port or ports is compared is higher frequency fringe of an optical data signal of at least one data port and another one of the frequencies of the outputs of the output monitoring ports being compared is a lower frequency fringe of an optical data signal of at least one data port, or 3) an electrical signal representing at least one output from another output monitoring port, wherein one outputs of the output monitoring port or ports is coupled to light from one order of the diffraction pattern and another of the outputs of the output monitoring port or ports is coupled to light from another order of the diffraction pattern;
• and
• controlling the output center wavelength of said at least one output data port of said waveguide router according to said control signal from a comparison circuit.

An optical waveguide router device with feedback control, comprising:

• means for optical waveguide routing with an input port and at least one output data port and at least one output monitor port, each of said at least one data port and said at least one monitor port outputting a different light frequency with respect to the other with respect to an input optical data signal;
• means for converting an output of said at least one output monitoring port to an electrical signal;
• means for comparing the electrical signal converted from output of said at least one output monitoring port against 1) a reference signal, or 2) an electrical signal representing at least one output from another output monitoring port, wherein one of the frequencies of the outputs of the output monitoring port or ports is compared is higher frequency fringe of an optical data signal of at least one data port and another one of the frequencies of the outputs of the output monitoring ports being compared is a lower frequency fringe of an optical data signal of at least one data port, or 3) an electrical signal representing at least one output from another output monitoring port, wherein one outputs of the output monitoring port or ports is coupled to light from one order of the diffraction pattern and another of the outputs of the output monitoring port or ports is coupled to light from another order of the diffraction pattern;
• and
• means for controlling the output center wavelength of said at least one output data port of said optical waveguide router according to said means for comparing.