Title :
RF crosstalk in multiple-wavelength vertical-cavity surface-emitting laser arrays
Author :
Nakagawa, S. ; Syn-Yem Hu ; Louderback, D. ; Coldren, L.A.
Author_Institution :
Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA
fDate :
6/1/2000 12:00:00 AM
Abstract :
We present the crosstalk measured in multiple-wavelength vertical-cavity surface-emitting laser (VCSEL) arrays under RF modulation. The array consists of eight bottom-emitting VCSEL\´s arranged with a "pie"-like configuration within a 60-μm-diameter circle with a 3-μm spacing for coupling into a multimode fiber. The crosstalk is investigated by measuring a cross-modulation response of two VCSEL\´s in the array using a monochromator in an optical spectrum analyzer as a receiver. Excess crosstalk is minimized by flip-chip mounting the array and introducing a proper bias condition. The crosstalk observed In the adjacent VCSEL\´s is less than -40 dB at the modulation frequency below 700 MHz and it Increases at 20 dB/decade above this frequency when both VCSEL\´s are biased at 5.0 mA.
Keywords :
crosstalk; electro-optical modulation; monochromators; optical testing; optical transmitters; semiconductor device testing; semiconductor laser arrays; spectral analysers; surface emitting lasers; 5 mA; 60 mum; RF crosstalk; RF modulation; bias condition; bottom-emitting VCSEL; cross-modulation response; flip-chip mounting; modulation frequency; monochromator; multimode fiber coupling; multiple-wavelength vertical-cavity surface-emitting laser arrays; pie-like configuration; receiver; Fiber lasers; Frequency modulation; Optical arrays; Optical crosstalk; Optical modulation; Optical receivers; Radio frequency; Spectral analysis; Surface emitting lasers; Vertical cavity surface emitting lasers;
Journal_Title :
Photonics Technology Letters, IEEE
