Abstract: In order to meet the demand of fabrication and application of 2N optical power splitters, theoretical and experimental researches were carried out for broadband integrated 22 3dB couplers. The traditional asymmetric X-junction was improved by using three-dimension beam propagation method, through simulation and design,22 3dB couplers with low loss and wide operating bandwidth were obtained. Considering characteristics of asymmetric X-junction, the broadband 22 3dB coupler was successfully made by using Ag+-Na+ ion-exchange in glass. The measurement of light spectrum, using two broadband light source with wavelength respectively in 1260nm~1360nm and 1460nm~1600nm, showed that the insertion loss was less than 4.0dB in the broadband range, wavelength response was relatively flat and wavelength insensitive, uniformity was less than 0.5dB. The results prove that, using the improved asymmetric X-junction combined with ion-exchange technique, broadband 22 3dB couplers with good performance can be fabricated in glass, which lays good foundation for further optimization of the device performance and successful development of its valuable application.