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Polarization rotator

A polarization rotator, polarization rotation technology, applied in the direction of instruments, optical waveguide light guides, light guides, etc., can solve the problem that the device is not suitable for micron-scale waveguide platforms and so on

Active Publication Date: 2019-10-11
ROCKLEY PHOTONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a device is not suitable for micron-scale waveguide platforms, since the final polarization rotator would need to be on the order of centimeters (and thus totally unsuitable for implementation on photonic integrated circuits)

Method used

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Embodiment Construction

[0049] Aspects and embodiments of the invention are discussed below with reference to the accompanying drawings. Further aspects and embodiments will be apparent to those skilled in the art. All documents mentioned herein are incorporated herein by reference.

[0050] Figure 1A and Figure 1B A perspective view of a polarization rotator 100 according to the invention is shown. In general, the rotator can be regarded as comprising: an input waveguide 101 , a rib waveguide formed by a slab portion 102 and a ridge portion 103 , and an output waveguide 105 . Light entering the rotator enters an input waveguide 101 whose width shrinks until it matches the first width of the rib waveguide. As light passes through the rib waveguide, the polarization of the light is rotated from TM to TE or vice versa. The properties of rib waveguides are discussed in more detail below. Once the light has passed through the rib waveguide, the light enters the output waveguide. The width of the ...

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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...

Claims

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Application Information

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IPC IPC(8): G02B6/126G02B6/10
CPCG02B6/126G02B6/105G02B6/2766G02B6/14G02B27/286G02B6/2733G02B2006/12061G02B6/122G02B6/2773
Inventor 吴东润A.J.齐尔基
Owner ROCKLEY PHOTONICS INC
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