These cables are available in QSFP to XFP Cable

QSFP to XFP Cable is suitable for very short distances and offer data rates up to 40Gb/s supporting Fiber Channel, Ethernet, SDH/SONET and Infiniband standards to maximize performance.Common direct attach cables include SFP cables, SFP+ cables, QSFP+ cables, MIni SAS cables, CX4 cables. These direct attach cables can meet The nitty gritty details between an QSFP to XFP Cable optics module and an SFP+ optics module are fairly straight forward.  For XFP, on the transmit side of things, the optics module standard provided additional signal conditioning before it put the signal onto the fiber.The nitty gritty details between an XFP optics module and an SFP+ optics module are fairly straight forward.  For QSFP to XFP Cable, on the transmit side of things, the optics module standard provided additional signal conditioning before  For SFP, there is no additional signal conditioning provided in the module specification.This all really comes down to a pretty straight forward difference: QSFP to XFP Cable has additional logic and circuitry that is physically inside the module to improve the signal going into and out of the 10GbE Controller's serial PHY.This is why SFP+ modules are smaller, and generally consume 0.5-1.0W less than respective XFP modules.