Optical fiber filter with ultra-wide tuning range

An optical fiber filter to filter at least one multi-wavelength optical signal emitted from at least one input optical fiber for output to at least one output optical fiber, the optical fiber filter comprising:

• at least optical fiber circulator in communication with the at least one input optical fiber and the at least one output optical fiber;
• a two-dimensional mechanical rotating mirror disposed in optical communication with the at least one multi-wavelength optical signal, the two-dimensional mechanical rotating mirror being configured to rotate in two-dimensions and being configured to reflect the multi-wavelength optical signal;
• two gratings each disposed in optical communication with a respective one of the collimated beams and being configured to disperse the respective beam into light of different wavelengths at different diffraction angles;
• first total reflection components correspondingly arranged on front ends of the two gratings and being configured to reflect the beams to the respective gratings;
• and
• wherein the two-dimensional mechanical rotating mirror is configured to select the light of at least one of the different diffraction angles as the respective filtered signal for output to the output optical fiber.