High Extinction Ratio Mach–Zehnder Modulator Applied to a Highly Stable Optical Signal Generator

Photonic Millimeter-Wave Generation and Distribution Techniques for Millimeter/Sub-Millimeter Wave Radio Interferometer Telescope

“…PMD delay, which is caused during the signal transmission, needs to be reduced because it deteriorates the accuracy of the delay amount by affecting the signal polarization and wavelength. The two coherent-optical-signals generator , Kiuchi et al (2007)) is required to help stabilization of polarization, and to maintain the high extinction ratio, and to keep the signal state of polarizations in stable condition for preventing the delay generation. We proposed the double difference phase measurement method.…”

“…The output spectrum depends on the DC bias voltage applied to the electrodes in the MachZehnder structure. The Mach-Zehnder modulator has the following two operation modes , Kiuchi et al (2007), Sakamoto et al (2005)). …”

“…Signals generated by the two coherent-optical-signals generator in the previous section , Kiuchi et al (2007)) are sent to the antennas from the base-station (ground unit), together with PMD Fig. 12.…”

20-Gb/s QPSK W-band (75-110GHz) wireless link in free space using radio-over-fiber technique

“…1, our transmitter consisted of a frequency quadrupler and optical QPSK generator. The frequency quadrupler using a dual-parallel Mach-Zehnder modulator (DPMZM) can generate the forth order harmonics of the modulation signal fed to the electric input of the modulator [7]. Highextinction ratio operation of the DPMZM can effectually suppress the odd harmonics in the optical output.…”

A 15-meter multi-gigabit W-band bidirectional wireless bridge in fiber-optic access networks

“…At the downlink (DL) transmitter, an continuous-wave (CW) lightwave at 1550.2 nm from an external cavity laser (ECL 1) is fed into a Mach-Zehnder modulator (MZM). By driving the MZM with a 20.35 GHz modulation signal and adjusting the applied bias voltage to the modulator, the fourth order harmonics of the driving signal can be generated at the modulator output [11]. After the MZM placed an arrayed waveguide grating (AWG) with 50 GHz channel grids, which is used to block the optical central carrier while separating the upper / lower sidebands (USB / LSB).…”