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Optical Circulators

Castech's high power Optical Circulator could routes incoming signals from Port1 to Port2, incoming port2 signals to port3. This component has excellent performance of low insertion loss, low PDL and high stability.


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     Castech's high power Optical Circulator could routes incoming signals from Port1 to Port2, and incoming port2 signals to port3. This component has excellent performance of low insertion loss, low PDL and high stability. The parameters can be customized according to customer requirements.

 

Features:                                                      Applications:

◆ Center wavelength is 1030/1064nm                       Changing direction of incoming signals

Each side of circulator has fiber                              Maintain frequency stability in fiber optical system

Handling power up to 10W                                                           

The type of fiber is customized                                                  

 

Specifications: 


Tri-port Isolator

Center Wavelength

1030/1064nm

Operating Wavelength Range

±10nm

Peak Isolation

≥35dB

Isolation in band at 23

≥30dB

Insertion Loss at 23

≤1.00dB

Polarization Dependent Loss

≤0.15dB

Return Loss (Input/Output)

≥50dB

Fiber Type

HI1060Fiber/PM Fiber or Specify

Optical Power (Average)

3, 5, 10Wor Specify

Peak Pulse Power

10KW or Specify

Operating Temperature

10-50℃

Storage Temperature

0-60℃

Product specifications are subject to change without notice

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

Note:All products are RoHS compliant

 

Device

Product Type

Wavelength(nm)

Power (W)

Datasheet

Isolator

polarisation-maintaining

980,1030,1064 or other

0-10

Tri-port Isolator-1

non-polarisation-maintaining

0-20


Circulator

polarisation-maintaining

0-10

Optical Circulator-1

non-polarisation-maintaining

0-20

Optical Circulator-2


Product  number

Type

(t)

Power

(p)

Fiber  type

(f)

Wavelength

(λ)

End  Diameter

(e)

Fiber  length

(l)

Wave  plate

(b)

Housing

(h)

HPISO-t-p-f-e-1-b-h

C

(Commom)

≤20 W


1(10/125SCF)

2(20/130DCF)

3(12/250DCF)

4(20/250DCF)

5(30/250DCF)

10(HI1060  )

980nm

1030nm

1064nm

2000nm

...

L

(900μm Loose Tube)

B

(3mm Loose Tube)

1(1m)

2(1.5m)

C

(Containing)

N

(Not Containing)

A03,...

A02,...

TRI

(Tri-port)

6(PM 980)

7(PM10/125SCF)

8(PM20/130DCF)

9(PM30/250DCF)


1.Introduction

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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