A two-stage cascaded Mach-Zehnder modulator is employed for the linear external modulation of a laser. The modulation electric fields are applied on the first and second stages in the Z and Y directions, respectively. Because of the inherent versatility of the adjustable modulation parameters, improved modulation performances with a high modulation depth and a high linear response are demonstrated. When a modulation depth of 21% is required, the ratios of the second and third harmonic terms to the fundamental term can be simultaneously achieved as low as — 104 and — 86.7 dB, respectively.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics