Design of a holographic concave grating used as a multiplexer/demultiplexer in dense wavelength-routed optical networks with subnanometer channel spacing.

摘要

The performance parameters of a free-space concave grating multiplexer/demultiplexer have been evaluated for applications in wavelength routed optical networks. The conditions for the stationarity of astigmatism with wavelength were rigorously derived and a novel design method was adopted to minimize the optical aberrations. The performance of this system is close to diffraction-limited over the wavelength ranges 148O-1520nm or 153O-157Onm. The optical isolation is better than — 30dB for a channel spacing of 0-5nm and the losses due to aberrations are estimated to be less than 4dB. The results can be used to design a spectrograph suitable for wavelength cross-connection in all-optical networks.