Method for setting the trigger power of transmitter diodes

US6466041B1 · kind B1 · utility

Assignees

• TEMIC Semiconductor GmbH · DE
• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Jens Egerer · Birkenfeld, DE
• Johann Hauer · Erlangen, DE
• Michael Reinhold · Munich, DE
• Rainer Rodenheber · Leingarten, DE

Key dates

• Filing date: Sep 27, 2000
• Grant date: Oct 15, 2002
• Expiry date: Dec 14, 2020

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04L25/26
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A method for setting the trigger power of transmitter diodes that transmit data via optical paths allows the transmission power to be adjusted and adapted to the communication distance. The trigger power is determined for the present communication distance on the basis of a test signal before data transmission begins. A circuit arrangement implementing the method includes a driver circuit with a switching device that switches a circuit junction point selectively to a supply voltage or to a constant reference voltage, a voltage-controlled resistor which delivers the driver current and is controlled from the circuit junction point, and a voltage-controlled measuring resistor which delivers a measured current with a fixed relationship to the driver current and is controlled from the circuit junction point. Since the set trigger power can be reduced, the power consumption for data transmission can be reduced considerably.