Overview

The AFBR-720XPDZ is a 10GbE XFP optical transceiver module operating at 850 nm wavelength, designed for high-speed serial optical data communications at 9.9 to 10.325 Gb/s. It complies with IEEE 802.3ae 10GBASE-SR standards and RoHS directives, optimized for multimode fiber applications.

Key Features

• RoHS 6/6 compliant
• IEEE 802.3ae 10GBASE-SR compliance for 10 GbE at 10.325 Gb/s
• 3.3V single power supply operation
• 850 nm VCSEL laser and PIN photodiode from Avago Technologies
• No reference clock required
• LC duplex optical connector per ANSI/TIA/EIA-604-10 (FOCIS 10)
• Maximum power dissipation of 1.5 W
• Supports link lengths up to 300 m with OM3 fiber
• Operating case temperature range: 0 to +70 °C
• Superior thermal and EMI integrity for high port densities
• Customizable clip-on heatsink for various line card environments
• IEC 60825-1 Class 1 / CDRH Class 1 laser eye safety certified

Applications

• Fibre Channel switches
• Host bus adapter cards
• Mass storage systems and server I/O
• Ethernet switches
• Core routers

Description

The module integrates an 850 nm VCSEL laser transmitter with driver and signal conditioner ensuring low jitter and IEEE compliance. The receiver uses a PIN photodiode with low dark current and high responsivity. Digital diagnostics via a 2-wire serial interface provide real-time monitoring of temperature, supply voltage, laser bias current, output power, and received power. Features include transmitter disable, power down, fault monitoring, and receiver loss of signal detection.

Installation

Hot-pluggable into any compliant XFP port, allowing insertion during system operation. The housing design protects against ESD and ensures effective thermal contact with the heatsink through the cage.

Functional Description

Transmitter Section

Includes 850 nm VCSEL laser, driver, and signal conditioner. Optical output is controlled via a monitor photodiode and IC to maintain signal integrity over temperature and voltage variations. Transmitter can be disabled via pin 5 (TX_DIS) or serial interface.

Eye Safety Circuit

Laser power is maintained below Class 1 eye safety limits. In case of laser failure, the microcontroller and driver IC detect faults, shut down the laser, power down the module, and assert fault signals.

Receiver Section

Features PIN photodiode with amplification and signal conditioning. Includes Loss of Signal (RX_LOS) indicator to detect insufficient optical input power, signaling link failures. RX_LOS status accessible via serial interface.

Electrical Interface

Uses a 30-pin right-angle connector with 0.8 mm pitch. Provides internally AC-coupled, terminated differential data inputs and outputs, minimizing external components. Pinout includes power, ground, transmitter disable, receiver loss of signal, fault indicators, and two-wire serial interface (SDA, SCL).

Power Supply Filtering

Host board power supply filtering recommended with inductors and capacitors on +5 V, +3.3 V, +1.8 V, and -5.2 V lines to ensure stable operation.

Absolute Maximum Ratings

• Storage temperature: -40 to +85 °C
• Operating case temperature: 0 to +70 °C
• Supply voltage (VCC3): 0 to 3.6 V
• Power dissipation: max 1.5 W
• Relative humidity: 0 to 90%

Exceeding these limits may cause permanent damage.

Recommended Operating Conditions

• Supply voltage (VCC3): 3.135 to 3.465 V
• Data rate: 9.9 to 10.325 Gb/s

Electrical Characteristics

• Transmitter differential input impedance: 100 Ω ±5%
• Input differential amplitude: 120 to 820 mV peak-to-peak
• Receiver differential output amplitude: 340 to 850 mV peak-to-peak
• Jitter and eye mask compliant with IEEE 802.3ae

Optical Characteristics

• Laser output power: minimum -4.3 dBm typical
• Mean optical output power: -7.3 to -8 dBm
• Extinction ratio: minimum 3.0 dB
• Spectral width (rms): 0.45 nm typical
• Center wavelength: 840 to 860 nm
• Transmitter dispersion penalty: max 3.9 dB
• Receiver sensitivity: minimum -18.8 dBm
• Receiver reflectance: max -12 dB

Optical eye mask meets IEEE 802.3ae 10GBASE-SR requirements.

Timing Characteristics

• Transmitter disable assertion time: max 10 µs
• Transmitter disable negation time: max 2 ms

Timing and Signal Assertion Delays

• Initialization time after power-on or hot plug: 300 ms
• Interrupt assertion delay: 200 ms
• Interrupt negation delay: 500 µs
• Power-down/reset assertion: minimum 80 µs
• Power-down/reset negation: max 300 ms
• Fault indication assertion/negation: approx. 8 ms
• Module deselect assertion/de-assertion: max 2 ms
• Loss of signal (Rx_LOS) assertion: 800 µs
• Loss of signal negation: 2.3 ms
• Serial ID clock frequency: up to 400 kHz

Mechanical and Assembly Details

Module assembly includes clip, host board, heat sink, cage assembly, module bezel, EMI gasket, and connector. Temperature measurement points are defined on the module case. Mechanical drawings and host board layouts support integration.

Digital Diagnostic Interface and Serial Identification

Implements 2-wire serial interface compliant with XFP MSA Rev 4.0 and memory map Rev 2.0. The 256-byte I2C address space is divided into lower (128 bytes, always accessible for diagnostics) and upper blocks (serial ID, user EEPROM, reserved, vendor-specific). Diagnostics enable predictive failure identification, compliance prediction, fault isolation, and component monitoring.

Diagnostic Features and Monitoring Parameters

• Predictive Failure Identification: Early detection of potential link issues to enable failover and maintain uptime.
• Compliance Prediction: Real-time alerts when operating limits are exceeded, e.g., received optical power.
• Fault Isolation: Diagnostic data helps pinpoint link problems for faster servicing.
• Component Monitoring: Monitors internal temperature, laser bias current, transmitted and received optical power, and supply voltage.

Key Monitored Parameters

• Internal temperature on PCB (indicator of thermal drifts or failures)
• Laser DC bias current (closed-loop feedback for constant optical power)
• Transmitted average optical power (constant under normal operation)
• Received average optical power (for cable plant compliance and fault isolation)
• Auxiliary monitors including 3.3V supply voltage

Regulatory Compliance and Safety

• ESD Immunity: Tested per MIL-STD-883 Method 3015; withstands 500 V (high-speed pins), 2000 V (low-speed pins), 25 kV contact discharge on LC receptacle, 8 kV contact and 15 kV air discharge on optical connector.
• EMI Compliance: Meets FCC Class B, CENELEC EN55022 Class B, VCCI Class A; immunity testing shows no bit errors up to 80 V/m without chassis enclosure.
• Laser Safety: Certified Class 1 laser product under US FDA CDRH, IEC EN60825-1 and EN60825-2, with TUV certification.
• Flammability: Complies with UL 94V-0 standard.

Important: No user-serviceable parts inside. Tampering voids warranty and may cause failure or unsafe operation. Use only approved optical sources and operate within specified limits to avoid regulatory recertification.

Application Support and Ordering

Evaluation kits and reference designs are available to facilitate integration and testing. Customers should contact local sales representatives or authorized distributors for ordering. Additional technical resources and documentation are accessible via the manufacturer's website.