Double-Pass EA Modulator Array Monolithically Integrated with Passive-Waveguide

Koji YAMADA  Koji NAKAMURA  Hideaki HORIKAWA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E81-C   No.8   pp.1245-1250
Publication Date: 1998/08/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on High-Capacity WDM/TDM Networks)
Category: 
Keyword: 
electroabsorption modulator,  array,  reflection,  

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Summary: 
An electroabsorption (EA) modulator array using a double optical-pass (DP) configuration has been developed to obtain high-speed modulation in parallel. Feeding electrical signals from the highly reflective side of the modulator eliminated component assembly problems with lenses and microwave feeder lines. Passive waveguide integration enabled wafers to be cleaved with very short absorbers. The degradation in frequency response was theoretically calculated to be <0. 2 dB compared to that of EA modulators without a passive waveguide. A common upper doping layer in the absorber and passive waveguide regions was introduced to attain high product throughput due to good epitaxial flatness and processing. The integrated 4-channels multiquantum well DP EA modulator array demonstrated high overall performance for a wavelength range from 1545 to 1558 nm. It features a drive voltage of 2 V for 10 dB attenuation, an insertion loss of 12 dB, and 4 channels17 GHz bandwidths for each channel, with low -20 dB crosstalk between adjacent waveguides.