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Layer having a non-linear taper and method of fabrication

  • US 9,939,582 B2
  • Filed: 01/22/2016
  • Issued: 04/10/2018
  • Est. Priority Date: 04/21/2011
  • Status: Active Grant
First Claim
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1. A planar-lightwave circuit (PLC) including a first surface waveguide, the first surface waveguide comprising:

  • a first cladding layer comprising a first material characterized by a first refractive index;

    a second cladding layer comprising a second material characterized by a second refractive index; and

    a first layer comprising a third material characterized by a third refractive index that is greater than each of the first and second refractive indices, the first layer being between the first and second cladding layers, and the first layer having a first region, second region, and third region that is between the first region and second region, wherein the third region abuts the first region at a first point along a first axis, and wherein the third region abuts the second region at a second point along the first axis;

    wherein the first layer has a first thickness in the first region, a second thickness in the second region, and a third thickness in the third region that changes between the first thickness at the first point and the second thickness at the second point according to a substantially sinusoidal function of position, z, along the first axis; and

    wherein the first surface waveguide has a first mode-field profile in the first region, a second mode-field profile in the second region, and a third mode-field profile, MFD(h(z)), that changes between the first mode-field profile and second mode-field profile between the first point and the second point, MFD(h(z)) being characterized by a substantially sinusoidal function of position, z, along the first axis.

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