Features Closed-loop control laser diode average power extinction rati
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ADN2841-Continuous Rate Gbps Laser Diode Driver with Dual-Loop Control
Features Closed-loop control laser diode average power extinction ratio Does require data formatting Data rates from Mbps Gbps typical rise time) modulation current bias current drive capability Available small outline LFCSP packages Dual monitor photodiode inputs wavelength control purposes package only) IDTONE input wavelength identification supervisory channels package only) Laser fail/laser degrade alarms, automatic laser shutdown (ALS) operation Applications SONET OC-1/3/12/48 STM-0/1/4/16 Fibre Channel Ethernet DWDM dual wavelength fixing
ADN2841's unique control algorithm manages laser average power extinction ratio, optimizing overall laser performance.
Feedback Loop Design Enables Consistent Optical Performance over Temperature
address ever increasing infrastructure requirements fiber optic communications, Analog Devices focused providing high performance cost-effective interface solutions optical networking systems. ADN2841 continuous rate Gbps laser diode driver with dual-loop control average power extinction ratio. This design optimizes laser diode performance over temperature well lifetime, diode processing variations, diode supplier. Manufacturing savings seen through decreases component count area, both average power extinction ratio controls fully integrated into ADN2841. Additional cost reductions realized assembly time decreased laser similarity requirements eased. Greater overall system flexibility provided with modulation bias capabilities. These, along with other on-chip functionalities, allow cost-effective solutions increased data rates. ADN2841 will enable customers offer performance enhancements, cost reductions, improved system reliability while decreasing time market. Analog Devices more than years experience designing fiber optic components. expertise work you.
Dual-Loop Theory Operation
Laser diodes have current-in-to-light-out transfer functions, shown laser transfer function figure. characteristics this transfer function threshold current slope linear region beyond threshold current, referred slope efficiency (LI). monitor photodiode (MPD) required control laser diode. current into ADN2841 control power extinction ratio, continuously adjusting bias current modulation current response laser's changing threshold current light-to-current slope (LI). ADN2841 uses automatic power control (APC) maintain constant power over time temperature. ADN2841 also uses closed-loop extinction ratio control allow optimum settings extinction ratio every device. Thus SONET/ interface standards over device variation, temperature, time. Closed-loop modulation control eliminates need either overmodulate laser diode include external components temperature compensation. This reduces development time second sourcing issues that require characterizing each supplier's laser diode product.
OPTICAL POWER (mW)
LASER TRANSFER FUNCTION
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CURRENT (mA)
ADN2841's dual-loop control continuously maintains extinction ratio average optical power over wide temperature range, shown table below. Temperature (°C) Extinction Ratio (dB) 9.67 9.76 9.75 9.95 10.39 Average Optical Power (dBm) -3.59 -3.44 -3.06 -3.03 -3.35
Extinction Ratio Range 0.61 Average Power Range 0.56 (Typical Tracking Error
OPTICAL DIAGRAM
Gbps filtered optical 25°C, Mitsubishi FU-445 laser diode, ADN2841
2003 Analog Devices, Inc. rights reserved. Trademarks registered trademarks property their respective companies. Printed U.S.A. H02412-5-2/03(C)
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