Title :
A DFB-LD module integrated with 60 dB optical isolator for coherent lightwave transmission systems
Author :
Murata, A. ; Aoki, S.
Author_Institution :
Hitachi Ltd., Yokohama, Japan
Abstract :
The coupling efficiency between the distributed feedback-laser diode (DFB-LD) chip is presented and the single-mode fiber is as high as -5.7 dB (27%) including the insertion loss of the isolator. The spectral linewidth measurement using the self-delayed heterodyne method shows 26 MHz under the condition of IF=I/sub th/+50 mA. No changes in the DFB-LD chip properties are observed after packaging. The comparison to another DFB-LD module with a 30-dB isolator confirms the immunity of the spectrum against -14-dB Fresnel reflection. The results show that the DFB-LD module is sufficiently stable to be applied to the coherent lightwave transmission systems.<>
Keywords :
distributed feedback lasers; integrated optics; optical communication equipment; optical isolators; semiconductor junction lasers; spectral line breadth; DFB-LD chip properties; Fresnel reflection; coherent lightwave transmission systems; coupling efficiency between; distributed feedback-laser diode; insertion loss; optical isolator; packaging; self-delayed heterodyne method; single-mode fiber; spectral linewidth measurement; Insertion loss; Integrated optics; Isolators; Lenses; Optical feedback; Optical films; Optical losses; Optical mixing; Optical refraction; Packaging;
Journal_Title :
Photonics Technology Letters, IEEE
