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Effects of feedback

Effects of feedback

Feedback in control systems plays a critical role in shaping various operational parameters, extending beyond simple error reduction to influence stability, bandwidth, gain, impedance, and sensitivity. Understanding these effects requires examining a basic feedback system characterized by defined input, output, error, and feedback signals.
Feedback significantly modifies the gain of a control system. The gain of a system without feedback is altered by a factor of one plus GH, where G represents...

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Optical feedback effects in cw injection lasers.

W J Burke, M Ettenberg, H Kressel

|March 6, 2010

Summary

This summary is machine-generated.

External optical feedback enhances laser diode performance by reducing lasing threshold and increasing output power. This study details effects on continuous-wave (CW) oxide-defined stripe aluminum gallium arsenide (AlGaAs) lasers.

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Area of Science:

Semiconductor Lasers
Optoelectronics
Photonics

Background:

Laser diodes can operate as both light emitters and detectors.
External optical feedback influences laser diode characteristics.

Purpose of the Study:

To investigate the impact of external optical feedback on the operating characteristics of continuous-wave (CW) oxide-defined stripe aluminum gallium arsenide (AlGaAs) lasers.

Main Methods:

Utilizing a reflecting surface external to the laser diode.
Monitoring changes in laser output power, current at constant voltage, and voltage drop at constant current.

Main Results:

Optical feedback lowers the gain required to reach the lasing threshold.
Increased output power observed at a given direct current (DC) level.
Modifications in laser output power and electrical characteristics.

Conclusions:

External optical feedback significantly alters the performance of AlGaAs laser diodes.
This technique offers a method to enhance laser output power and efficiency.