![]() The polarization-independent optical isolator does not limit the polarization state of the forward light, allows the forward light of any polarization state to pass through without loss, and makes the reflected light offset from the forward optical path and cannot enter the active chip, so as to isolate the reflected light. ![]() The reflected light is absorbed by the polarizers or reflected away from the forward light path, so as to isolate the reflected light. Polarization-dependent optical isolator requires the linear polarization and the fixed state of polarization of forward light, usually it consists of an input polarizer, a Faraday rotator and an output polarizer. At the end of last century, the optical isolator technology has been gradually commercialized into two categories: polarization-dependent optical isolator and polarization-independent optical isolator. Its main function is to allow forward light to pass through without loss, while blocking reflected light from entering active chip, so that the active optical component can output the stable power, such as LD, SOA, SLD, etc. d: the path length through the optical material in meters.With the development of photoelectric technology, free-space optical isolator is widely used in active optical components.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. The pass optical power is 2 W only for connector added.Īn optical isolator is a passive magneto-optic device that only allows light to travel in one direction.IL is 0.3 dB higher and RL is 5 dB lower for each connector added.Above specification are for device without connector, and may change without notice.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. These devices can handle powers rang from 300mW to 150W or other on request, and have center operating wavelengths ranging from 500nm to 2100nm. It has been widely used in lasers, transmitters and other fiber optics communication equipment to suppress back reflection and back scattering.ĭK Photonics offers a large selection of polarization insensitive or polarization maintaining fiber-in to fiber-out isolators. ![]() The TGG Based 1030nm Optical Isolator is characterized with low insertion loss, high isolation, high return loss, excellent environmental stability and reliability. ![]()
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