General Photonics Corp.The VariDelay manually variable optical delay line from General Photonics Corp. provides precision optical path variation up to 20 cm. The company says the device can be incorporated into network equipment and test instruments or used in the laboratory for precision optical path length or timing alignment. Measuring 1 x 2 x 4 in., the compact, rugged instrument features a high delay-to-length ratio and an insertion-loss variation of 0.5 dB, maximum, over the entire range. 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