OZ Optics' PM fiber optic circulators are manufactured with polarization maintaining fibers, making them ideal for polarization maintaining applications such as 40 Gbit systems or Raman pump applications. They are also used in double pass amplifiers and in chromatic dispersion. Thorlabs' Optical Circulators are non-reciprocating, one-directional, three port devices which are great for bidirectional propagation of light in a single fiber., receive) signals without crosstalk and with low insertion loss. Our Optical Circulators provide unidirectional sequential coupling between a series of ported fibers; an input to. Z-Optics Limited has more than 20 years of experience in optics fields. Our products and services cover optical design, optical components manufacturing, lens assembling, optical measurement, Laser Diode modules, and Fiber Collimator/Coupler. Our Cir are GR-1221 and GR-1209 qualified. If you are interested in any of our products and need more details, you can enquiry us by email or by our web enquiry system, if you need a quotation about the product, please also confirm the product Part Number and quantity, so we can get back to you with a products quotation. They perform a similar function as an isolator, protecting the input fiber from return power, but also allowing the.