Full Laser Control with Fault Management

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The DS1861 is a laser-driver control IC designed to reduce the production cost of fiber optics circuits by eliminating multiple temperature tests. It works with nearly all laser-driver ICs to provide automatic power control (APC) and automatic extinction ratio control (AERC), which improves the performance of the system over temperature and aging. It also has built-in monitoring capability to provide early fault detection, which can be configured to latch the IC into a shutdown condition. Settings programmed into the DS1861 are stored in password-protected EEPROM memory, which write-protects calibration data. Programming is accomplished through an I²C-compatible interface, which can also be used to read diagnostic information.
DS1861: Typical Operating Circuit DS1861: Typical Operating Circuit Enlarge+

Key Features

  • Automatic Power Control (APC)
  • Automatic Extinction Ratio Control (AERC) Across Temperature and Laser Aging
  • Works in AC-Coupled Laser Systems
  • Configurable Latched Automatic Shutdown with Tx-Fault and Tx-Disable
  • Programmable Fast Alarm Conditions
  • I²C-Compatible Serial Interface Allows Up to Eight Devices on the Same Serial Bus
  • Operates Over Wide Supply-Voltage Range
  • Nonvolatile Memory for Device Settings
  • Small, 14-Pin TSSOP Package
  • -40°C to +95°C Operating Temperature Range


  • Optical Transceivers
  • Optical Transponders
Product Reliability Reports: DS1861.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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