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Optical Isolators

Optical isolators are vital devices for eliminating the undesirable effect of return beams in high-speed optical fiber transmittance routes and amplifiers. Optical isolation also protects your equipment from dangerous ground loops, spikes and surges.

Conoptics manufactures a family of modular Faraday rotators and interchangeable accessories which can be combined to perform various isolation functions.

Features

The unique feature of a Faraday rotator is its non-reciprocity, that is, the fact that the "handedness" of the polarization rotation it imparts on a transmitted beam is dependent on the beam's propagation direction. By far the most common application of Faraday rotators is their use in optical isolators, devices used to protect laser sources from harmful back reflections.

Faraday Rotators
The Faraday rotators included in the 700 Series consist of one or more high flux NIB permanent magnets and a terbium glass element. Tuning is accomplished by moving the glass between regions of high and low field strength. An important feature of the Conoptics design is that the glass does not rotate as it is moved thereby eliminating the possibility of transmitted beam nutation due to residual wedge. Polarization rotation is a function not only of the axial magnetic field strength, but also of the glass length, L, and its Verdet constant, V. More precisely, on axis where z is along the propagation direct.

Specifications

Model	Tuning Range	Isolation	Transmission
711A	500 - 645nm	37 - 40dB	92%
711C	390 - 500nm	28 - 30dB	85%
712A	532 - 715nm	37 - 40dB	92%
712B	644 - 780nm	37 - 40dB	92%
712TGG	700 - 900nm	37 - 40dB	92%
713A	790 - 980nm	37 - 40dB	92%
714	815 - 1080nm	37 - 38dB	90%
715	965 - 1135nm	32 - 38dB	90%
716D	Specify	56 - 60dB	88%
716TGG	1064nm	56 - 60dB	88%