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US 7,680,370 B2Granted
Optical wavelength coupler using multi-mode interference
AssigneeDoohwan Lee
InventorsBongjun Lee, Jongkyun Hong
Life of this patent
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Abstract
Provided is an optical wavelength coupler using a multi-mode interference. The optical wavelength coupler is a planar waveguide type optical device that can distribute or couple two optical signals having different wavelengths by using the multi-mode interference. The optical wavelength coupler is suitable for integration and is small-sized. Also, the optical wavelength coupler has a low manufacturing tolerance and a low loss, and is insensitive to TE/TM polarization.
Claims12
An optical wavelength coupler comprising:
- a multi-mode waveguide (2) having a thickness (d) and a width (WMM) determined by wavelengths (λ1,λ2) of a first or second optical signal, a refractive index (n) of the multi-mode waveguide, and an interference on the multi-mode waveguide, and having a length (LMM) determined by a distance in which self-images or pseudo self-images of the first optical signal (λ1) and the second optical signal (λ2) are formed, the multi-mode waveguide (2) distributing the first optical signal (λ1) or the second optical signal (λ2) inputted at one side of the multi-mode waveguide (2), with one or more self-images and pseudo self-images at periodic intervals in a proceeding direction, so as to output at its opposite side a predetermined optical power.
Dependencies are inferred from the claim text.