The experimental results of a 2x2 integrated thermooptic Mach-Zehnder interferometer(MZI)switch based on multimode interference(MMI)couplers are reported.The insertion loss(IL)is 3.40 dB,the polarization dependent los...The experimental results of a 2x2 integrated thermooptic Mach-Zehnder interferometer(MZI)switch based on multimode interference(MMI)couplers are reported.The insertion loss(IL)is 3.40 dB,the polarization dependent loss is 0.47 dB,the extinction ratio(ER)at bar state and cross state is 32.01 dB and 16.42 dB respectively,the response time is less than 3 ms,and the power consumption is 658 mW.Regarding the asymmetry of extinction ratio at bar state and cross state,theoretical analysis is first presented.The coupling ratio of the two MMI couplers deviates from 50׃50 but the deviation is nearly the same,which is decided by good uniformity of semiconductor planar lightwave circuit(PLC)process.This property affects the extinction ratio at bar state and cross state in different mechanisms.Adding a metal electrode on the waveguide affects its effective index and analysis based on experimental results is given.The increment of waveguide effective index is in the order of 2x10^(-4).展开更多
Modulation arms with different widths are introduced to Mach-Zehnder interferometers （MZIs） to obtain improved performance. Theoretical analysis and numerical simulation have shown that when tile widths of tile two ...Modulation arms with different widths are introduced to Mach-Zehnder interferometers （MZIs） to obtain improved performance. Theoretical analysis and numerical simulation have shown that when tile widths of tile two arms are properly designed to achieve an inherent mπ/2 （m is an odd integer） optical phase difference between the arms, the asymmetric MZI presents higher modulation speed. Furthermore, the carrier-absorption induced divergence of insertion losses in silicon-on-insulator （SOI） based MZI optical switches can be obviously improved.展开更多
文摘The experimental results of a 2x2 integrated thermooptic Mach-Zehnder interferometer(MZI)switch based on multimode interference(MMI)couplers are reported.The insertion loss(IL)is 3.40 dB,the polarization dependent loss is 0.47 dB,the extinction ratio(ER)at bar state and cross state is 32.01 dB and 16.42 dB respectively,the response time is less than 3 ms,and the power consumption is 658 mW.Regarding the asymmetry of extinction ratio at bar state and cross state,theoretical analysis is first presented.The coupling ratio of the two MMI couplers deviates from 50׃50 but the deviation is nearly the same,which is decided by good uniformity of semiconductor planar lightwave circuit(PLC)process.This property affects the extinction ratio at bar state and cross state in different mechanisms.Adding a metal electrode on the waveguide affects its effective index and analysis based on experimental results is given.The increment of waveguide effective index is in the order of 2x10^(-4).
基金Supported by the National Natural Science Foundation of China under Grant No 60336010, and the Special Funds for Major State Basic Research Project of China under Grant No G20000366.
文摘Modulation arms with different widths are introduced to Mach-Zehnder interferometers （MZIs） to obtain improved performance. Theoretical analysis and numerical simulation have shown that when tile widths of tile two arms are properly designed to achieve an inherent mπ/2 （m is an odd integer） optical phase difference between the arms, the asymmetric MZI presents higher modulation speed. Furthermore, the carrier-absorption induced divergence of insertion losses in silicon-on-insulator （SOI） based MZI optical switches can be obviously improved.
