1. FDFD has also been used for various scattering problems at optical frequencies . 2. An optical fibre is a dielectric guide designed to work at optical frequencies . 3. This assumption is typically valid in transparent media in the optical frequency range. 4. Currently, optical frequency combs have provided a much simpler method of measuring optical frequencies . 5. High permittivity dielectric particles can be used to simulate silicon behaviour at optical frequencies . 6. Currently, optical frequency combs have provided a much simpler method of measuring optical frequencies. 7. At infrared and optical frequencies , a common technique is ellipsometry. 8. A "'frequency comb "'allows a direct link from radio frequency standards to optical frequencies . 9. A similar approach uses spectral shaping of optical frequency combs to create multiple pulse trains. 10. Alternative DTS evaluation units deploy the method of Optical Frequency Domain Reflectometry ( OFDR ).
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