AFBR-725SMZ 25GE SFP+ for Multi-Mode Optical Fiber Digital Diagnostic SFP, 850nm, Low Voltage (3.3V) 25GBASE-SR, Ethernet Optical Transceiver Data Sheet escription D Features Avago Technologies AFBR-725SMZ optical transceiver Compliant to RoHS directives supports high speed serial links over multi-mode optical 850nm Vertical Cavity Surface Emitting Laser (VCSEL) fiber at 25.78Gb/s (the serial line rate of 25GE). The Class 1 eye safe per IEC60825-1 and CDRH product is compliant with Small Form Pluggable industry Wide temperature range (0C to 70C) agreements SFP and SFP28 for mechanical and low speed electrical specifications. High speed elec- LC duplex connector optical interface conforming to ANSI TIA/EIA604-10 (FOCIS 10A) trical and optical specifications are compliant with IEEE 802.3 for 25GBASE-SR. Diagnostic features per SFF-8472 Diagnostic Monitoring Interface for Optical Transceivers The AFBR-725SMZ is a 850nm transceiver which ensures Enhanced operational features including variable compliance with 25GBASE-SR specifications. Per the re- electrical EQ/emphasis settings quirements of 25GE, internal clock and data recovery Real time monitoring of: circuits (CDRs) are present on both electrical input and electrical output of this transceiver. These CDRs will lock - Transmitter average optical power at 25.78Gb/s - Received average optical power - Laser bias current Digital diagnostic monitoring information (DMI) is present in the AFBR-725SMZ per the requirements of SFF-8472, - Temperature providing real time monitoring information of transceiver - Supply Voltage laser, receiver and environment conditions over a SFP28 mechanical specifications per SFF-8432 SFF-8419 2-wire serial interface. SFP28 compliant low speed interface per SFF-8419 Related Products 25GBASE-SR compliant optical link distances AFBR-89CDDZ: 850nm QSFP28 for 100GBASE-SR4 AFBR-79EQDZ: 850nm QSFP+ for 40GBASE-SR4, 100m AFBR-79E3PZ: 850nm QSFP+ for 40GBASE-SR4, 300m Applications AFBR-709ISMZ: 850nm SFP+ for 10GBASE-SR/SW, -40/85C Ethernet switches (director, stand alone, blade) AFBR-709SMZ: 850nm SFP+ for 10GBASE-SR/SW, 0/70C Ethernet NIC Cards/Adapters AFCT-709SM: 1310nm SFP+ for 10GBASE-LR, 0/70C Port side connections Patent - www.avagotech.com/patents Inter-switch or inter-chassis aggregated links Avago Technologies Proprietary Note the Tx CDR is engaged with Rx RATE=high (25GE) Transmitter Section and disengaged (bypassed) with Rx RATE=low (other The transmitter section includes a Transmitter Optical data rates, such as 10GE). Sub-Assembly (TOSA), laser driver circuit, Clock and Data Recovery circuit (CDR) and an electrical input stage with variable equalization controls. The TOSA contains a Digital Diagnostics 850nm Vertical Cavity Surface Emitting Laser (VCSEL) The AFBR-725SMZ is compliant to the Diagnostic light source with integral light monitoring function Monitor-ing Interface (DMI) defined in document and imaging optics to assure efficient optical coupli- SFF-8472. These features allow the host to access, via 2- ng to the LC connector interface. The TOSA is driven wire serial, real time diagnostic monitors of transmit by a laser driver IC, which uses the diff erential output optical power, received optical power, temperature, from an integral Tx CDR stage to modulate and regul- supply voltage and laser op-erating current. ate VCSEL optical power. As mandated by 802.3, the integral CDR cleans up any incoming jitter accumulated Low Speed Interfaces from the host ASIC, PCB traces and SFP electrical conne- Conventional low speed interface I/Os are available ctor. Between the SFP electrical connector and Tx CDR is as defined in documents SFF-8419 to manage coarse a variable, 2-wire serial controlled, equalization circuit and fine functions of the optical transceiver. On the to optimize SFP performance with non ideal incoming el- transmit side, a Tx DISABLE input is provided for the ectrical waveforms. host to turn on and off the outgoing optical signal. A transmitter fault indicator output, Tx FAULT, is available Receiver Section for the SFP to signal a host of a transmitter operational The receiver section includes a Receiver Optical Sub- problem. A received optical power loss of signal Assembly (ROSA), pre-amplification and post-amplifi- indicator, RX LOS, is available to advise the host of cation circuit, Clock and Data Recovery Circuit and a receiver operational problem such as a low an electrical output stage with variable emphasis optical input condition. controls. The ROSA, containing a high speed PIN detector, pre-amplifier and imaging optics efficiently couple light from the LC connector interface and perform an optical to electrical conversion. The resulting diff erential electrical signal passes through a post amplification circuit and into a Clock and Data Recovery circuit (CDR) for cleaning up accumulated jitter. OPTICAL INTERFACE ELECTRICAL INTERFACE RECEIVER RD+ (RECEIVE DATA) RD- (RECEIVE DATA) Rx Vout & Rx AMPLIFICATION LIGHT FROM FIBER PHOTO-DETECTOR Emphasis Rx LOSS OF SIGNAL & QUANTIZATION CDR Rx RATE SELECT RS(0) MOD SDA Controller MOD SCL MOD ABS TRANSMITTER TX DISABLE TD+ (TRANSMIT DATA) LASER DRIVER & Tx Tx TD- (TRANSMIT DATA) LIGHT TO FIBER VCSEL SAFETY CDR Equalization CIRCUITRY TX FAULT Tx RATE SELECT RS(1) Figure 1. Transceiver functional diagram. 2 Avago Technologies Proprietary