Polarization rotator

Abstract

The disclosure discloses a polarization rotator and a polarization stabilizer. The polarization rotator includes a rib waveguide. The rib waveguide includes: a slab portion; and a ridge portion, whichis disposed along a surface of the slab portion. The slab portion has a first slab region whose width, as measured in a direction perpendicular to a guiding direction of the waveguide, increases froma first slab width to a second slab width along a first length, and the ridge portion has a first ridge region whose width, as measured in the same direction as the slab widths, decreases from a first ridge width to a second ridge width along the same first length; such that the rotator is configured to rotate the polarization of light during its transmission through the rib waveguide.

Description

technical field [0001] The present invention relates to polarization rotators and accompanying polarization stabilization means, and in particular to polarization rotators built on micron-scale silicon platforms. Background technique [0002] In general, optical waveguides have different propagation characteristics for transverse electric (TE) and transverse magnetic (TM) light. This may lead to different optimum operating wavelength ranges for silicon photonic devices using these two polarized light. For large waveguides, this effect can be very small. However, for small waveguides or waveguides that include two-dimensional structures (eg, polarization-sensitive quantum wells), the effect can be very large. For example, some 1310nm QCSE modulators are only suitable for TE polarized light. [0003] In some arrangements, the transmissive photonic integrated circuit chip includes at least one polarization-sensitive modulator driven by an off-chip laser. Light is coupled in...

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Problems solved by technology

However, such a device is not suitable for micron-scale waveguide platforms, since the final polarization rotator would

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