Optical modulator
AssigneeFujitsu Limited
InventorsHiroshi Hamano, Izumi Amemiya, Hiroshi Nishimoto, Takefumi Namiki, Izumi Yokota, Tadashi Okiyama, Minoru Seino
Life of this patent
Estimating the term…
Abstract
A Mach-Zehnder interferometer type modulator, constructed of first and second optical waveguides, first and second electrodes cooperating with the same, and a driving voltage source, wherein a driving voltage source is constructed of first and second driving units which drive independently the first and second electrodes in accordance with a data input and wherein the first and second driving units apply first and second driving voltages, individually determined, to the first and second electrodes.
Claims23
An optical modulator comprising, fundamentally,
- a Mach-Zehnder interferometer type modulator, which is constructed by a first optical waveguide and a second optical waveguide;
- a first electrode and a second electrode cooperating with the first optical waveguide and the second optical waveguide;
- and
- driving means for relatively changing the phases of the light in the first and second optical waveguides in accordance with a data input,
- the driving means comprising a first driving unit and a second driving unit which independently drive the first electrode and the second electrode,
- the first and second driving units applying a first driving voltage and a second driving voltage determined independently, to the first and second electrodes,
- the first electrode and the second electrode being respectively comprised of a first line electrode and a second line electrode forming a mutually symmetric coupled line and
- the first driving unit and the second driving unit applying mutually differential first and second driving voltages to the first and second line electrodes.
An optical modulator comprising, fundamentally,
- a Mach-Zehnder interferometer type modulator, which is constructed by a first optical waveguide and a second optical waveguide;
- a first electrode and a second electrode cooperating with the first optical waveguide and second optical waveguide;
- and
- driving means for relatively changing the phases of the light in the first and second optical waveguides in accordance with a data input,
- the driving means comprising a first driving unit and a second driving unit which independently drive the first electrode and the second electrode,
- the first and second driving units applying a first driving voltage and a second driving voltage determined independently, to the first and second electrodes,
- the first and second driving voltages being used to make the mutual phases of the lights propagating through the first and second optical waveguides asymmetric, the center wavelength at the rising edge of the modulated light from the optical modulator being shifted to the long wavelength side and the center frequency at the falling edge of the modulated light being shifted to the short wavelength side.
Dependencies are inferred from the claim text.