Fig. 1. Schematic drawing of PCDR resonators.
Fig. 2. Coverage of the coherent output states for , , under different and . A potential QPSK constellation is shown in the top right case.
Fig. 3. Variation of the output amplitude under the condition (a) for various levels of , 0.0005, 0.001; and (b) for a phase shift , which gives the maximum real value of . Note that the scale of the vertical axes in (a) and (b) are different.
Fig. 4. Coverage of coherent output states for and , (a) , (b) , (c) , and (d) . (e) for different .
Fig. 5. Coverage of coherent output states for and , for , . (a) , (b) , (c) , (d) . (e) The variation of the with .
Fig. 6. Influence of the structure asymmetry in dual-racetrack resonators. The red and blue lines represent and for , respectively, for an ideal structure whose parameters are the same as Fig. 5. The symbols represent the results for a structure (a) with 20% asymmetry in , and (b) with 20% asymmetry in the quality factor.