Polarization-Dependent Isolators-Polarizer Type Polarization Dependent Isolator Introduction to the working principle of polarization dependent isolator Low insertion loss and high-power handling capability. The optical fiber isolators are used to protect light sources from adverse effects caused by back-reflection or signal. The single mode optical isolator is a passive magneto-optical device which uses the Faraday effect of magneto-optic crystal to isolate the reflected light and only allows the light to transmit in a single direction. Polarization-maintaining single-mode optical fiber isolator d: the path length through the optical material in meters.B: the magnetic flux density in teslas.V: the Verdet Constant, a property of the optical material, in radians/T.The amount of rotation β equals V x B x d, where V, B, and d are as defined below.įigure 1. The direction of rotation is dependent on the direction of the magnetic field and not on the direction of light propagation thus, the rotation is non-reciprocal. In 1842, Michael Faraday discovered that the plane of polarized light rotates while transmitting through glass (or other materials) that is exposed to a magnetic field. In high-power applications, back reflections can cause instabilities and power spikes.Īn isolator's function is based on the Faraday Effect. Back reflections can damage a laser source or cause it to mode hop, amplitude modulate, or frequency shift. Isolators are used to protect a source from back reflections or signals that may occur after the isolator. If there is pulse application, please be sure to inform us of pulse energy and peak power.Īn optical isolator is a passive magneto-optic device that only allows light to travel in one direction.If you need higher handle power, please look for our 1064nm High power isolator. For this 1064nm Isolator, Due to high IL, it is recommended to use average power of The default connector key is aligned to slow axis. For devices with connectors, IL will be 0.3dB higher, RL will be 5dB lower and ER will be 2dB lower.Above specifications are for device without connector.“B” for Both axis working, “F” for Fast axis blocking DK Photonics can respond to custom requirements with short lead times.
Requests for custom fiber pigtails, different wavelengths and handling power of operation or other specific needs will be readily addressed. If you do not see a standard isolator that meets your needs, we welcome the opportunity to review your desired specification and quote a custom isolator.
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