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Combined splitter, optical isolator and spot-size converter

A technology of optical isolators and polarizers, which is applied in the direction of instruments, optics, light guides, etc., and can solve problems such as bulky components

Active Publication Date: 2016-02-10
LUMENTUM OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the downside, since the isolator uses two wedge-shaped birefringent crystals, the resulting part is relatively bulky

Method used

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  • Combined splitter, optical isolator and spot-size converter
  • Combined splitter, optical isolator and spot-size converter
  • Combined splitter, optical isolator and spot-size converter

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Embodiment Construction

[0036] As noted above, one approach that has been used to adjust the shape and / or size of light emitted by a laser is to use a pair of anamorphic wedge prisms. This method is based on the refraction effect, which exploits the change in the radius of the beam when it is refracted at the interface of a flat prism. see Figure 5 , when the beam enters the first prism, the interface between the air and the prism material (such as glass) refracts the beam at an angle determined by Snell's law. Since the light beam is from a medium with a lower refractive index (such as n 空气 ≈1) to a medium with a higher refractive index (such as n 玻璃 ≈1.5) transfer, it will be refracted towards the normal of the interface between the two media under the condition that the incident angle is not 90 degrees. In general, there is distortion magnification associated with such refraction. More specifically, the beam diameter in the plane of incidence may be stretched or magnified by a certain factor....

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PUM

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Abstract

An integrated and compact multifunctional optical isolator (i.e., a combined splitter, isolator, and spot-size converter), which is suitable for use in a TOSA, includes input optics including a first polarizer, a Faraday rotator, and a second polarizer. The input optics includes a wedge having a partially reflective coating disposed on a first face thereof. The input beam is incident on the first face at a non-normal angle of incidence such light passing through the wedge is refracted to a second face of the wedge, which is tilted relative to the first face by a predetermined wedge angle. At least one of the non-normal angle of incidence and the predetermined wedge angle is determined with dependence upon a refractive index of the wedge material and a target anamorphic magnification of the input beam of light.

Description

technical field [0001] The present invention relates generally to optical isolators and, in particular, to multifunctional optical isolators suitable for use in TOSAs. Background technique [0002] Optical transceivers are commonly used in fiber optic networks to convert between optical and electrical signals. Generally speaking, an optical transceiver includes a transmitting optical sub-module (TOSA) and a receiving optical sub-module (ROSA). TOSA usually includes a light emitting device, such as a laser chip, and ROSA usually includes a light receiving device, such as a photodiode. [0003] see figure 1 , a typical TOSA includes a speckle converter 120 , an isolator 140 and a beam splitter 160 . The mode spot converter 120 adjusts the shape and / or size of the beam emitted by the laser chip 101 and collimated by the collimator lens 115 to improve the coupling efficiency into the optical fiber, thereby providing higher power. Isolator 140 prevents back-reflected light fro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/27
CPCG02F1/093G02B6/2746G02B6/32G02B6/4209G02B6/4286G02B6/2773
Inventor 迈克尔·C.·拉尔森熊伟李兆明周芬红
Owner LUMENTUM OPERATIONS LLC
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