| 摘要 |
Described herein is an optical channel monitor (100) for monitoring properties of a wavelength channel in an optical transmission system. The channel monitor (100) includes a plurality of input ports in the form of optical fibers (102) disposed in a vertical "port displacement" dimension. Each fiber (102) inputs a respective optical beam (103) having a plurality of individual wavelength channels. By way of example, an optical beam may be a dense wavelength division multiplexed (DWDM) signal having a plurality of wavelength channels equally spaced apart in frequency by 50GHz. The signals, in the form of optical beams (103), are transmitted through a lens (104) which collimates each beam and converges the beams in the port displacement dimension to a focal plane (105). The collimated and converged beams are incident onto a selectively movable spatial manipulation element in the form of a rotatable micro-electromechanical system (MEMS) mirror (106). This mirror selectively directs each optical beam onto a wavelength dispersion element in the form of a grism (108) at a predetermined angle (denoted by Õ) in a horizontal "dispersion" plane. The grism (108) spatially separates, in the dispersion plane, the wavelength channels contained within each optical beam (103) by diffraction. The angle at which each channel is diffracted is controlled by the angle Õ. |
