239000010409 thin film Substances 0.000 abstract description 3.239000004065 semiconductor Substances 0.000 claims description 5.Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Assignors: PAN, JING JONG Application granted granted Critical Publication of US5726801A publication Critical patent/US5726801A/en Assigned to JDS UNIPHASE CORPORATION reassignment JDS UNIPHASE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by E Tek Dynamics Inc filed Critical E Tek Dynamics Inc Priority to US08/361,604 priority Critical patent/US5726801A/en Assigned to E-TEK DYNAMICS, INC. Original Assignee E Tek Dynamics Inc Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US08/361,604 Inventor Jing-Jong Pan Current Assignee (The listed assignees may be inaccurate.
#USES FOR AN OPTICAL ISOLATOR PDF#
Google Patents Reduced optical isolator module for a miniaturized laser diode assemblyÄownload PDF Info Publication number US5726801A US5726801A US08/361,604 US36160494A US5726801A US 5726801 A US5726801 A US 5726801A US 36160494 A US36160494 A US 36160494A US 5726801 A US5726801 A US 5726801A Authority US United States Prior art keywords light laser diode quarter wave plate end surface Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5726801A - Reduced optical isolator module for a miniaturized laser diode assembly In high-speed optical fiber transmittance amplifiers and routes, they are considered indispensable devices due to their capability of eliminating the adverse effect of return beams.US5726801A - Reduced optical isolator module for a miniaturized laser diode assembly It is thus a key device in order to achieve stable laser diode operation. This helps in not affecting the coherence of the laser affecting any damage to the diode itself as feedback is capable of frequency shift, noise, mode hopping or amplitude fluctuation. Optical isolators are used in many applications, such as laser applications where they are used to prevent unwanted feedback into the laser source. Polarization-dependent isolators use input and output polarizers along with a Faraday rotator, whereas polarization-independent isolators use input and output birefringent wedges along with a Faraday rotator. Optical isolators can also be categorized into polarization-dependent isolators and polarization-independent isolators.
![uses for an optical isolator uses for an optical isolator](http://www.seekic.com/uploadfile/ic-circuit/2012121002133312.gif)
![uses for an optical isolator uses for an optical isolator](https://img.directindustry.com/images_di/photo-mg/36188-3908151.jpg)
![uses for an optical isolator uses for an optical isolator](https://img.laserfocusworld.com/files/base/ebm/lfw/image/2019/03/content_dam_lfw_en_articles_2015_01_optical_isolator_from_conoptics_is_used_with_1064_nm_nd_yag_lasers_leftcolumn_article_thumbnailimage_file.png)
Optical isolators are available with high power and low-power polarizers.
![uses for an optical isolator uses for an optical isolator](https://www.sensata.com/sites/default/files/styles/p_img_active/public/media/images/2019-04-17/sensata-optical-isolator-module-encoder-position-image.jpg)
In this manner, energy is either absorbed or reflected depending on the polarizer type. The rotator then rotates the polarization of the input light by 45 degrees and is allowed to exit through the output polarizer. The input polarizer is arranged to act as a filter and only allows linearly polarized light into the rotator. An optical isolator is comprised of a Faraday rotator with magnet, input polarizer and output polarizer.