CASTECH's high power in-line isolators have center wavelength of 980/1030/1064nm, could maintain frequency stability in fiber lasers, fiber amplifier, optical sensor. High power in-line Isolators handling power are up to 100W.

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    CASTECH's high power in-line isolators have center wavelength of 980/1030/1064nm, could maintain frequency stability in fiber lasers, fiber amplifier, optical sensor. High power in-line Isolators handling power are up to 100W. The parameters can be customized according to customer requirements.


Features:                                                Applications:

Center Wavelength at 980/1030/1064 nm              Maintain frequency stability in fiber lasers, amplifier, optical sensor

Both side of  Isolators has fiber                            Used in fiber optic measuring equipment

Handling power up to 50W                                   Changing direction of incoming signals

Type of fiber is customized



Polarization Independent

High power

Center Wavelength



Operating Wavelength Range



Peak Isolation



Isolation inbandat 23



Insertion Lossat 23



Polarization DependentLoss



Return Loss(Input/Output)



Fiber Type

HI1060 Fiber/LMA Fiber/PM Fiber or Specify

Fiber Length




0.5, 2W or Specify

5, 10, 30, 50W, 100W or Specify

Peak Pulse Power


20KW or Specify

Operating Temperature


Storage Temperature


Product specifications are subject to change without notice

Customized (Wavelength, Dimension, Power Handling , etc) are available

Note:All products are RoHS compliant



Product Type


Power (W)




1064 or other



980,1030,1064 or other


980,1030,1064 or other


980,1030,1064 or other



The main component of the optical isolator is the Faraday rotator. The magnetic field B, applied to the Faraday rotator causes a rotation in the polarization of the light due to the Faraday effect. The angle of rotation θ is given by θ=vBL, where v is the Verdet constant of the magneto-optic material, and L is the length of the magneto-optic material. Specifically for an optical isolator, the values are chosen to give a rotation of 45°.

2.Faraday Rotator

Faraday rotator is an important optical element in an isolator. The characteristics of a Faraday rotator include a high Verdet constant, low absorption coefficient, low non-linear refractive index and high damage threshold. The two most commonly used materials for the 700–1100 nm range are terbium doped borosilicate glass and terbium gallium garnet crystal (TGG). For  infrared wavelength range, typically for the 1300-4000nm, yttrium iron garnet crystals are used (YIG).


Faraday rotator provides non-reciprocal rotation while maintaining linear polarization. That is, the polarization rotation due to the Faraday rotator is always in the same relative direction. So in the forward direction, the rotation is positive 45°. In the reverse direction, the rotation is −45°. This is due to the change in the relative magnetic field direction, positive one way, negative the other. This then adds to a total of 90° when the light travels in the forward direction and then the negative direction. This allows the higher isolation to be achieved.

3.Optical Isolator

Optical isolator according to its physical principles can be divided into polarization dependent isolator and polarization independent isolator.The polarization dependent isolator, or Faraday isolator, is made of three parts, an input polarizer (polarized vertically), a Faraday rotator, and an output polarizer, called an analyser (polarized at 45°).


Polarization dependent isolators are typically used in free space optical systems. This is because the polarization of the source is typically maintained by the system. In optical fibre systems, the polarization direction is typically dispersed in non polarization maintaining systems. Hence the angle of polarization will lead to a loss.

The polarization independent isolator is made of three parts, an input birefringent beam displacer, a Faraday rotator, a half-waveplate, and an output birefringent beam displacer.

Polarization independent isolators are typically used in fiber laser systems to maintain frequency stability, such as industrial processing areas etc.

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