Integrated polarization-maintaining (PM) fiber optic isolators/tap couplers for wavelengths including 1550, 1480 and 1300 nm are offered by Micro Optics Inc. The devices come in 5.5-mm packages and are designed to provide performance, size and cost-effectiveness compared with separately spliced units. They feature an extinction ratio of >25 dB, a loss of <0.8 dB, isolation of >40 dB and return loss of >55 dB. Available PM fibers include Panda, bow-tie and oval clad. High-extinction-ratio PM fiber connectors are also available.