LIGHTEL Fiber Optic Isolators, Circulators and Faraday Mirrors

Name: LIGHTEL Fiber Optic Isolators, Circulators and Faraday Mirrors
Brand: Lightel
SKU: 17836

LIGHTEL micro-optic isolators, 3-port circulators and Faraday mirrors (FRM) — PI and PM versions, single- and dual-stage, 1064/1310/1480/1550 nm bands, high-power designs. Laser protection against back reflection, sensing and OTDR systems.

LIGHTEL isolators, circulators and Faraday mirrors are micro-optic components based on optical crystals, designed to manage the direction of light propagation. Isolators protect laser sources against back-reflected light, circulators route the signal between ports in a single direction, and Faraday mirrors (FRM) compensate polarization dispersion in interferometric and sensing systems.

Available in polarization-insensitive (PI) and polarization-maintaining (PM) versions, single- and dual-stage, in mini housings, for the 1064 / 1310 / 1480 / 1550 nm bands and in high-power designs.

Variants offered

Isolators: PI single-/dual-stage, mini-size (80 µm fiber), 2-in-1 and 3-in-1 1550 nm, 1064 nm, PM versions (including 1064 nm PM)
3-port circulators: PI 1310/1550 nm, PI 1064 nm, PM 1310/1550 nm, PM 1064 nm
Faraday mirrors (FRM): wideband 1550 nm, 1064 nm, with adjustable time delay
High-power versions: 20–100 W isolators, high-power PI 1064 nm circulator

Typical parameters — Single-stage PI Isolator

Parameter	Premium	A Grade
Center wavelength	1310 / 1480 / 1550 nm (± 15 nm)
In-band isolation (23°C)	≥ 32 dB	≥ 30 dB
Insertion loss (23°C)	≤ 0.4 dB	≤ 0.5 dB
Return loss (in/out)	≥ 60 / 55 dB
PDL	≤ 0.05 dB	≤ 0.1 dB
Max. power	500 mW

Typical parameters — 3-port PI Circulator 1310/1550 nm

Parameter	Premium	A Grade
Isolation (λc ± 20 nm)	≥ 50 dB typ. (min. 40 dB)
Insertion loss (23°C)	≤ 0.6 dB	≤ 0.8 dB
Return loss (RL)	≥ 50 dB
Max. power	500 mW

Values without connectors, Corning SMF-28e fiber. Higher specifications available on request.

Applications

Protection of laser sources and amplifiers against back reflection
Transceiver systems and optical signal processing
Interferometric (FRM) and distributed fiber optic sensors
OTDR and reflectometry systems (circulators)

Frequently asked questions

Why is a Faraday mirror (FRM) used in sensors?
An FRM reflects light with a 90° polarization rotation, thereby compensating the birefringence of the fiber path — crucial in fiber optic interferometers and sensors where polarization must remain stable.

PI or PM isolator — which to choose?
PI (polarization-insensitive) isolators are used in typical telecom paths; PM isolators — where the polarization state must be preserved, e.g. in coherent and sensing systems.

Are there high-power and 1064 nm versions?
Yes — we offer 20–100 W isolators and 1064 nm components (PI and PM) for fiber lasers.

Ordering information and configuration

All LIGHTEL passive components are made to order and configured to the application requirements. When submitting an inquiry, please specify: wavelength range, fiber type, required parameters (insertion loss, isolation, PDL), connector type (LC / SC / FC / MPO or unconnectorized pigtail) and housing / packaging type. Price is quoted individually — use the “Request a quote” button.

INTERLAB is the authorized LIGHTEL distributor in Poland — we provide technical advice, component selection and after-sales support.