[Guiguo, Nakano]

The alignment and the mode matching of the MZI has been almost done.
- The three BSs were replaced from the 30:70 splitting ratio one to 50:50 one.
- The mode matching telescope for the delay line was modified and installed.
- The contrast of the first MZI was more than 90 %. We will measure tomorrow
- The contrast of the second MZI, including the delay line, was 94 % (Vmax = 1.7, Vmin = 0.21, Voffset = 0.16). (see attached figure)

We still have the potential to increase the contrast by using the stage for the mode matching lenses. We will do the fine alignemt and mode matching tomorrow.