Filter response of nonuniform almost-periodic structures

  title={Filter response of nonuniform almost-periodic structures},
  author={Herwig Kogelnik},
  journal={The Bell System Technical Journal},
The filter response of nonuniform, almost-periodic structures, such as corrugated optical waveguides, is investigated theoretically. The filter process, leading to reflection of a band of frequencies near the Bragg frequency, is treated as a contradirectional coupled-wave interaction and shown to obey a Riccati differential equation. The nonuniformity of the structure is represented by a tapering in the coupling strength (e.g., the depth of the corrugation) and by a chirp in the period of the… CONTINUE READING
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