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Home Moldova Technologies Laser Emission Module for Fiber Optic Communications

Laser Emission Module for Fiber Optic Communications


The module allows decreasing the coupling losses using an original simplified method for fiber optic communication systems, which offers a simple adjustment of the fiber for focusing the laser spot into the fiber core. The original manufacturing method was elaborated using a double quantum well InGaAs / InGaAsP / InGaP / GaAs laser diode mounted in a 5 pin original package fitted with a monitor photodiode and a thermistor for temperature monitoring. The laser is fiber-coupled, using low numerical aperture optic fiber (FO) with microlens. The fiber is fixed and adjusted using solder (10) heated in a microheater (8). This method allows removing and reinstalling the fiber in order to reduce optical losses and optimize the laser light injection into the fiber core.

Innovative Aspect and Main Advantages

  • Decrease of coupling losses in the optical module;
  • Technology simplification.

Areas of Application

Fiber optic communication systems, pumping of Er+ – doped devices; material characterization; Raman spectroscopy.



Fig.1. Emitted module design (a) and photo (b). 1 - peltier thermocooler;
2 - Cu carrier; 3 - single mode fiber optic; 4 microsaddle; 5 - laser diode;
6 - AlN or BeO carrier; 7 - Cu-Md carrier; 8 - quartz carrier with microheater;
9 – microheater; 10 - PbSn alloy; 11 - monitoring photodiode; 12 - thermistor.

Stage of Development

The optoelectronic module (1.3 μm operating wavelength) was tested at the Kursk State University, Russia.

Contact Details

Technical University of Moldova
Valerian DOROGAN, vice-rector, Sergiu ZAPOROJAN, department of scientific investigations
Address: 168, Stefan cel Mare St. Chisinau, MD-2004, Republic of Moldova
Tel/Fax: (+373 22) 235 437; 235 405
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it , This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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