A Few-Mode Fiber Isolator (FMF Isolator) is a passive optical device based on Optical Space Division Multiplexing (OSDM) technology. Specifically designed for use in Few-Mode Fibers (FMFs), it achieves unidirectional transmission of optical signals, effectively isolating reflected light and echo signals, thereby enhancing the quality and stability of optical signal transmission. Compared to single-mode fibers, FMFs can support the transmission of multiple modes of optical signals, increasing the transmission capacity of the fiber.
Working Principle
The working principle of the FMF Isolator primarily relies on the Faraday effect in magneto-optic crystals. When an optical signal enters the isolator through the fiber, it first passes through a polarizer, converting it into linearly polarized light with a specific orientation. This polarized light then traverses a rotator, where it undergoes Faraday rotation under the influence of a magnetic field, changing the polarization direction by a certain angle. Finally, it passes through an analyzer (in some designs, the polarizer doubles as the analyzer), allowing only optical signals with a specific polarization to pass through, thus realizing unidirectional transmission.
Specifically, the Faraday effect refers to the phenomenon where the plane of polarization of light rotates as it propagates through a magneto-optic medium under the influence of an external magnetic field. In an FMF Isolator, through a carefully designed magnetic field and magneto-optic medium, the polarization plane of the forward-propagating optical signal rotates, while the reflected or echoed signal propagating in the reverse direction is effectively isolated due to the mismatch in polarization direction.
Characteristics
High Isolation: The FMF Isolator achieves high isolation of reflected and echoed signals, effectively protecting the light source and optical path system from interference.
Low Insertion Loss: The forward-propagating optical signal experiences minimal attenuation as it passes through the isolator, ensuring efficient optical signal transmission.
Broadband Capability: It supports the transmission of multiple wavelength optical signals, making it suitable for broadband communication systems.
High Stability: It employs reliable magneto-optic materials and precise optical design to ensure stability during long-term operation.
Low Mode Crosstalk: In FMFs, the isolator effectively suppresses crosstalk between different modes, enhancing transmission quality.
Applications
The FMF Isolator has broad application prospects in optical communication and optoelectronic devices. Specific applications include:
Fiber Communication Systems: In high-speed, long-haul fiber communication systems, the FMF Isolator isolates optical signals between the transmitter and receiver, preventing reflection interference and echo noise, improving transmission quality and system stability.
Fiber Sensing Systems: In fiber sensing systems, the isolator separates optical signals between sensors and controllers, ensuring measurement accuracy and reliability.
Optical Instruments and Equipment: Such as spectrometers, lasers, and optical amplifiers, the FMF Isolator isolates optical signals between inputs and outputs, protecting equipment from reflected and echoed signals.
Medical Field: It plays a crucial role in isolating and protecting optical signals in medical equipment, including optical imaging systems and laser surgical instruments.
In summary, with its advantages of high isolation, low insertion loss, broadband capability, and high stability, the FMF Isolator has significant application value in optical communication, optoelectronic devices, and the medical field.
Shenzhen optics forest Co.,Ltd specialist manufacturer of Few-Mode Fiber Isolator！
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Specifications
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Parameter
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Unit
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Value
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Operating wavelength
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nm
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1550
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Bandwidth
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nm
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±20
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Typ. Peak Isolation
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dB
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25
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Isolation at 23℃
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dB
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≥30
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Typ. Insertion Loss at 23℃
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dB
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0.8
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Insertion Loss at -5~70℃
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dB
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≤1.0
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Return Loss (Input/Output)
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dB
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≥40/40
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PDL
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dB
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≤0.1
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Optical Power
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CW
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≤500
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Operating Temperature
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(℃)
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-5 ~ +70
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Storage Temperature
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(℃)
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-40~+85
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Fiber Type
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--
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四模光纤or 两模光纤
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Dimension(φ×L)
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mm
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5.5x35
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光林销售
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