Buy the high quality and highly efficient 10gbase-bx40-d smf 1330nm-tx/1270nm-rx 40km dom lc wdm bidi sfp+ transceiver module cisco sfp-10g-bx40d-i compatible with our factory. We are one of the leading manufacturers and suppliers in China, providing you with customized service at reasonable price. Check the quotation with us now. http://www.focc-fiber.com/fiber...m-tx-1270nm-rx-40km.html