Principles,Applications,and Features of Fiber Optic Faraday Rotation Mirror

2024-07-20 18:07:55

The optical fiber Faraday rotating mirror (FRM) is an optical device based on the Faraday effect. Its working principle, characteristics, and applications can be summarized as follows:

Working Principle

The FRM utilizes the Faraday effect, where the plane of polarization of linearly polarized light rotates when propagating through a medium (such as a Faraday rotator) placed in a magnetic field. The rotation angle is proportional to the length of the medium, the magnetic induction intensity, and the frequency of the light. In an optical fiber Faraday rotating mirror, the input optical signal first passes through the Faraday rotator, where its plane of polarization rotates by a specific angle (e.g., 90 degrees or 180 degrees). It is then reflected back by a reflective device (e.g., a mirror) and passes through the Faraday rotator again, rotating the plane of polarization by the same angle but in the opposite direction. Therefore, the output optical signal's plane of polarization rotates twice the initial angle (e.g., 180 degrees or 360 degrees) compared to the input. Due to the non-reciprocity of the Faraday effect, where the magnetic field's effect on light does not depend on the direction of light propagation, the FRM exhibits unique advantages in fiber-optic communication and sensing systems.

Characteristics

Non-reciprocity: The non-reciprocity of the Faraday effect enables the FRM to eliminate the impact of back-reflected light and Rayleigh scattered light in the fiber, enhancing system stability and reliability.

Wide wavelength range: It is suitable for various wavelength optical signals, such as 1310nm and 1550nm, catering to different application scenarios.

Low insertion loss: Special optical path design and material selection achieve low insertion loss, improving optical signal transmission efficiency.

High stability and reliability: Employing all-glass hermetic technology, it exhibits low temperature dependence, adapting to various environmental conditions.

Polarization control: Effectively controls the polarization state of optical signals, eliminating polarization sensitivity in fiber systems.

Applications

Fiber-optic sensing systems: In fiber-optic sensing systems, the FRM can improve system anti-interference capability and measurement accuracy.

Fiber-optic communication systems: In fiber-optic communication systems, the FRM eliminates the impact of back-reflected light and Rayleigh scattered light on optical signals, enhancing system transmission performance.

Fiber-optic instruments: As a crucial optical component, the FRM can be used in fiber-optic instruments for specific measurement and testing functions.

Laser systems: In laser systems, the FRM controls the polarization state of laser beams, improving laser system stability and performance.

In summary, the optical fiber Faraday rotating mirror, with its unique working principle, excellent performance, and wide range of applications, plays a vital role in fiber-optic communication, sensing, and laser technologies.

Shenzhen optics forest Co.,LTD provide fiber Faraday rotating mirrors with wavelengths of 1310nm, 1550nm, 1064nm, 1030nm, and 2000nm,

Here are the detailed parameter specifications of our 1310nm and 1550nm fiber Faraday rotating mirrors!

Specifications
Parameter	Unit	Value
Center Wavelength (λc)	nm	1310, 1550
Working wavelength range	nm	±30
Faraday rotation angle（single pass）	degree	45±1, 90±2
Insertion Loss (Refleciton rate)	dB	≤0.5
Polarization Dependent Loss (PDL)	dB	≤0.1
Polarization Mode Dispersion (PMD)	ps	≤0.1
Directivity	dB	≥50
Return Loss	dB	≥50
Power handling(CW)	mW	≤500
Tensile Load	N	≤5
Fiber type	-	SMF-28e
Package size	mm	Φ5.5xL35 or Φ2.5xL12mm
Operating Temperature	℃	-5 to +70
Storage Temperature	℃	-40 to +85

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Principles,Applications,and Features of Fiber Optic Faraday Rotation Mirror

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