Wavelength-independent polarization converter

Details Wavelength-independent polarization converter Wavelength-independent polarization converter

1985-09-26

1987-09-08

LaRoche, Eugene R.

350 9613, G02B 610

Patent

active

046919848

ABSTRACT:
An electrooptical polarization mode converter that operates independently of the wavelength of the light being converted. The converter includes a titanium in-diffused waveguide formed in a lithium niobate substrate, but light is propagated in the direction of the optic axis, rather than perpendicular to it as in prior devices. Both transverse-electric (TE) and transverse magnetic (TM) modes experience the same material refractive index, and mode switching can be effected with only minimal phase velocity mismatch, by applying a bias voltage across the waveguide. The phase velocity mismatch is corrected electrooptically by applying an orthogonal electric field to the waveguide, and mode switching and phase velocity correction effects can be controlled independently. The resulting device is not only wavelength independent, but is insensitive to temperature changes, immune to optical damage due to the photorefractive effect and immune to problems often caused by out-diffusion of lithium oxide from lithium niobate.

REFERENCES:
patent: 4291939 (1981-09-01), Giallorenzi et al.
patent: 4533207 (1985-08-01), Alferness

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