optical power The standard is expanding to SFP+, which will be able to support data rates up to 10.0 Gbit/s (that will include the data rates for 8 Gbit Fiber Channel, and 10 GbE). Possible per- formances of different realistic SFP transceivers are reported in Table 5.11. 5.9.2.2 XFP Transceivers for Telecommunications The MSA for the XFP transceiver was born after the start of the success of the SFP format to provide a transceiver with a form factor suitable to host 10 Gbit/s transmission compo- nents, but sufficiently compact to reproduce the advantages of the SFP. In a short time it was evident that the XFP industrial standard was really tailored according to the system needs and at present this is the only type of transceiver used in telecom equipments whose evolution is targeted to high-performance interfaces at 10 Gbit/s. At the beginning the target was a simple short-reach or medium-reach interface, but the evolution of the lasers and the Mach-Zehnder modulators integrated on InP platform is driving the development of a new generation of high-performance XFPs with tunable long-reach interfaces. Thus, at present, there are a large number of different XFP transceivers designed for telecommunications: from the transceivers with gray short-reach interfaces for application in the client ports of optical equipments to short-, intermediate-, and long-reach DWDM interfaces, both with fixed and tunable lasers, to CWDM 10 Gbit/s transceivers. The drawing of an XFP transceiver is presented in Figure 5.84 with the indication of the transceiver's main dimensions. XFP transceivers are slightly greater than SFPs, but they Technology for Telecommunications: Integrated Optics and Microelectronics Rear electrical connector Fourté's delatch mechanism 18.4 mm 76 mm 8.5 mm Dustplug Receiver optical bore Transmitter optical bore FIGURE 5.84 Pictorial representation and dimensions of a pluggable XFP transceiver. are by far the smaller 10 Gbit/s interfaces suitable for DWDM transmission, and even if the transmission performances 