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ALTERNATIVE TO OPTICAL ISOLATOR PDF
ALTERNATIVE TO OPTICAL ISOLATOR SERIES

In the backward direction operation ( Fig. Operating principles of a two-stage, polarization-dependent optical isolator: (a) operation in the forward direction and (b) operation in the backward direction. To construct a two-stage optical isolator, the required minimum materials are three polarizers (birefringent crystals) and two Faraday rotators, and they can be configured by inserting the Faraday rotators between the polarizers (birefringent crystals).įIGURE 8. A multistage isolator can be constructed by simply cascading multiple single-stage isolators or by optimizing configurations that use fewer materials. For example, the isolation of a two-stage isolator generally is twice that of a single-stage isolator.

ALTERNATIVE TO OPTICAL ISOLATOR SERIES

Optical isolators can be used in series (cascaded) to increase the isolation. In some applications, a much higher isolation is desired. 7, the peak isolation of a typical single-stage isolator is about 40 dB, and the overall isolation is less than 30 dB with a rotation angle error of 2 degrees, which can be easily introduced due to environmental changes. Isolators described above are so-called single-stage isolators that have a basic configuration of a Faraday rotator sandwiched by two polarizing elements.

238000002310 reflectometry Methods 0.Yale Cheng, in Encyclopedia of Physical Science and Technology (Third Edition), 2003 I.E Multistage Optical Isolators.

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238000002955 isolation Methods 0.000 claims abstract description 18.

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Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Assignors: DUCK, GARY S., CHENG, YIHAO Application granted granted Critical Publication of US5768005A publication Critical patent/US5768005A/en Assigned to JDS UNIPHASE INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CHENG, YIHAO Application filed by JDS Fitel Inc filed Critical JDS Fitel Inc Priority to US08/533,837 priority patent/US5768005A/en Assigned to JDS FITEL, INC.

Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Priority to US08/178,838 priority Critical patent/US5471340A/en Assigned to JDS FITEL INC. Original Assignee JDS Fitel 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.)

Duck Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US08/533,837 Inventor Yihao Cheng Gary S.

ALTERNATIVE TO OPTICAL ISOLATOR PDF

Google Patents Multi-stage optical isolatorĭownload PDF Info Publication number US5768005A US5768005A US08/533,837 US53383795A US5768005A US 5768005 A US5768005 A US 5768005A US 53383795 A US53383795 A US 53383795A US 5768005 A US5768005 A US 5768005A Authority US United States Prior art keywords light input isolating stage output end Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US5768005A - Multi-stage optical isolator US5768005A - Multi-stage optical isolator