High Extinction Ratio Optical Isolator, PM Isolators

The high extinction ratio optical isolator (polarization-maintaining fiber optic isolators) is a fiber-coupled optical component which lets light pass through in one direction, but block it in the opposite direction. At the same time, by using PM Panda fibers it’s capable of maintaining a well-defined state of polarization (SOP) of the light with a high extinction ratio better than 20dB, 28dB, 30dB, or higher. This high extinction ratio optical isolator (PM isolator) is a good choice in many PM optical systems, since back-reflected light often have deleterious effects on the operating conditions of optical devices. Related Products ↓

More about high extinction ratio polarization-maintaining fiber optic isolators ...

High Extinction Ratio Optical Isolator (PM Isolator)

Because of the development of PM optical systems, high extinction ratio optical isolator (polarization-maintaining fiber optic Isolators) has become a very useful component, and normally it’s sealed in a compact and ruggedized pigtailed package.

Unless otherwise specified, this fiber-coupled high extinction ratio optical isolator (PM isolator) can be operating on both slow-axis and fast-axis linear polarizations; Transmitting the polarization state on slow axis in one direction and blocking the orthogonal state on fast axis in both directions is available on request.

High Extinction Ratio Optical Isolator (1310/1480/1550 nm)

High Extinction Ratio Optical Isolator PM Fiber Isolator

Download SPEC

FEATURES OF HIGH EXTINCTION RATIO OPTICAL ISOLATOR

High Extinction Ratio
Low Insertion Loss
High Isolation and Return Loss
High Reliability and Stability

APPLICATIONS OF HIGH EXTINCTION RATIO OPTICAL ISOLATOR

Optical Communication Systems
Fiber Laser
PM Fiber Optic Instrument
Optical Fiber Sensor

Specifications of High Extinction Ratio Optical Isolator (PM Isolators)
Center Wavelength (nm)	1310, 1480, 1550
Operating Wavelength Range (nm)	±20
Stage	Single-stage	Dual-stage
Peak Isolation @ 23 ℃ (dB)	42	58
Isolation @ 23 ℃ (dB)	≥28	≥48
Typ. Insertion Loss @ 23°C (dB)	0.4	0.5
Insertion Loss @ -5 ~ +70 °C (dB)	≤0.55	≤0.65
Extinction Ratio @ 23 ℃ (only for both axis working) (dB)	≥20 (default), ≥28	≥20 (default), ≥28
Extinction Ratio @ 23 ℃ (only for fast axis blocked) (dB)	≥25 (default), ≥30	≥25 (default), ≥30
Return Loss (dB)	≥50
Power Handling (mW)	≤300
Fiber Type	PM panda fiber
Package Dimensions (mm)	Φ5.5×35
Operating Temperature (°C)	-5 to +70
Storage Temperature (°C)	-40 to +85

Notes:

The high extinction ratio optical isolator (PM Isolator) is customizable, and the above specifications are subject to change without notice.
For device with connectors, IL is 0.3dB higher, RL is 5.0dB lower, ER is 2.0dB lower.
Unless otherwise specified, the slow axis of the fiber is aligned with the key of the PM fiber connector.
Slow axis working and fast axis blocked as standard, while operating on both the slow and fast axis available on request.
Bare fiber should not support the weight of the connector. So that if you need any connectors, it’s better to choose the 900μm loose tube jacket instead of the 250μm bare fiber.
For CW high-power optical interconnection, we recommend fusion splice without connectors.
For product customization or special requirements, please contact Lfiber’s sales department for availability.

Package Dimensions

High Extinction Ratio PM Isolator Polarization-Maintaining Optical Isolators

Ordering Information for High Extinction Ratio Optical Isolator (PM Isolators)
Center Wavelength	Stage	Axis Alignment	Fiber Type	Pigtail Type	Fiber Length	Connector
1310nm	Single-stage	Slow axis working and fast axis blocked	PM1310	250μm bare fiber	0.5 Meter	None
1480nm	Dual-stage	Fast axis working and slow axis blocked	PM1550	900μm loose tube	0.8 Meter	FC/UPC
1550nm		Both axis working	Others		1.0 Meter	FC/APC
					1.5 Meter	SC/UPC
					Specified	SC/APC
						LC/UPC
						LC/APC
						Others

About Axis Alignment of the PM Fiber Optical Isolator (High Extinction Ratio):

“Slow axis working and fast axis blocked” means that light on just the slow axis is transmitted and the fast axis light is blocked in the forward direction; Both the slow and fast axis light are blocked on the backward direction.
“Both axis working” means that both the slow and fast axis light are transmitted in the forward direction, both the slow and fast axis light are blocked in the backward direction.