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Optical waveguiding component comprising a band-pass filter

  • US 5,570,440 A
  • Filed: 08/02/1995
  • Issued: 10/29/1996
  • Est. Priority Date: 06/17/1993
  • Status: Expired due to Fees
First Claim
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1. Apparatus comprising an optical filter for selectively transmitting electromagnetic radiation within a passband of wavelengths that is bounded on respective sides by first and second stop bands of relatively low transmissivity, wherein:

  • a) the filter comprises a glass waveguiding medium having a core characterized by a core refractive index;

    b) the filter further comprises a set of one or more Bragg gratings formed in the medium, each grating at least partly defined by a repetitive pattern of perturbations of the core refractive index;

    c) associated with the set of gratings are at least two wavelength bands of relatively low transmissivity;

    d) each of said low-transmissivity bands coincides with at least a portion of a respective one of the stop bands;

    e) at least one of the low-transmissivity bands is a reflection band of a Bragg grating;

    f) the passband is broad enough to substantially transmit a signal channel at least 5 Å

    wide;

    g) the transmission of at least some wavelengths in each of the low-transmissivity bands is at least 10 dB below the peak transmission in the passband; and

    h) the first and second stop bands are each broad enough to substantially exclude wavelengths over a range of at least 10 Å

    .

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