2x 1.20 Max (30.0) FIGURE 5.80 External dimensions of an SMF MSA 300 PIN transponder. Optical input Rx clocks PIN or APD Rx data Serializer receiver limiting amp Receiver bias/ Tx clocks Modulator monitoring driver control Deserializer Tx data Modulator Status and control bias control Optical u-Processor output NV memory digital I/O modulator analog I/O Power supply FIGURE 5.81 Functional scheme of an MSA 300 PIN transponder. Telecommunication Networks TABLE 5.10 Parameters of Practical MSA 300 PIN Transponders Transmitter Intermedium reach Long reach Very short reach Tunability Modulation Channel spacing 50GHz Embedded compensation Negative chirp mechanisms Reach 40 km Bit rate 10 Gbit/s 10 Gbit/s 40 Gbit/s Output power 0.5 dBm 4.2 dBm 2 dBm Extinction ratio 8.2 dB Wavelength 1530-1570nm (FS) 1530-15651 nm 1530-1570nm (FS) 30 dB 30 dB Receiver Photodiode type Sensitivity -16dBm -25 dBm -5dBm Maximum received power -1 dBm -4dBm Return loss -37 dBm -30 dBm -27 dB General Operation temperature -5°C to 70°C -5°C to 70°C -5°C to 70°C Power consumption In Table 5.10 an overview of practical performances of MSA 300 PIN modules is reported. 5.9.2 Transceivers for Carrier-Class Transmission Pluggable transceivers were introduced initially in datacom equipment as an advanced version of fixed transceivers. However, the advantages of pluggability and the small form factor were SO appealing that telecom transceivers were introduced very soon. There are a plethora of standard transceiver formats, but at present only two are really used in the telecommunication environment, the others being either confined to datacom application or completely substituted by more advanced formats: small form-factor plug- gable (SFPs) and XFPs. Thus we will talk in detail only about these two standards. 5.9.2.1 SFP Transceivers for Telecommunications The SFP is the more compact optical transceiver used in optical communications. It inter- faces a network equipment mother board to a fiber-optic or unshielded twisted pair net- working cable. This 