Title :
High-resolution wavelength monitoring using differential/ratio detection of junction voltage across a diode laser
Author :
Lee, San-Liang ; Yu-Yi Pisu ; Pien, Ching-Tang
Author_Institution :
Dept. of Electron. Eng., Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan
Abstract :
High-resolution, compact, and power-insensitive wavelength monitoring can be realized by using a low-cost diode laser as the wavelength sensor. The wavelength resolution can be improved by more than an order with the help of the Fabry-Perot resonance inside the cavity of a diode laser, as well as by differential or ratio detection. Wavelength resolution of 0.01 nm can he obtained with much relaxed requirement on the detection circuitry. The wavelength monitoring with such resolution ran tolerate up to 15 dB of power variation on the incident light power.
Keywords :
differential detection; measurement by laser beam; monitoring; optical sensors; semiconductor lasers; wavelength division multiplexing; Fabry-Perot resonance; WDM; detection circuitry; differential/ratio detection; diode laser cavity; high-resolution wavelength monitoring; incident light power; junction voltage; low-cost diode laser; power-insensitive wavelength monitoring; wavelength monitoring; wavelength resolution; wavelength sensor; Circuits; Condition monitoring; Diode lasers; Envelope detectors; Optical interferometry; Phase detection; Resonance; Semiconductor lasers; Semiconductor optical amplifiers; Voltage;
Journal_Title :
Photonics Technology Letters, IEEE
