Negative bias to improve phase noise
AssigneeLumentum Technology UK Limited
InventorsSelina Farwell, Robert Griffin, Samuel Davies
Life of this patent
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Abstract
A method of operating an optoelectronic device comprising an optical waveguide section, the optical waveguide section comprising a semiconductor core, the method comprising the steps of determining (401) a range for a negative bias voltage for the waveguide section for which an optical loss of the core is lower than an optical loss at zero bias for an operating wavelength range of the device, selecting (402) a bias voltage within the range and applying (403) the selected bias voltage to the waveguide section.
Claims15
A method of operating an optoelectronic device comprising an optical waveguide section that includes a semiconductor core, the method comprising:
- determining, based on Franz-Keldysh effect, Free carrier plasma effect, and Inter-valence band absorption, a range for a negative bias voltage for the optical waveguide section for which an optical loss of the semiconductor core is lower than an optical loss at zero bias for an operating wavelength range of the optoelectronic device;
- selecting a bias voltage within the operating wavelength range;
- and
- applying the bias voltage to the optical waveguide section.
An optical waveguide section comprising:
- an intrinsic semiconductor core located between doped semiconductor cladding layers;
- and
- a biasing apparatus for providing a negative bias voltage across the optical waveguide section,
- wherein the negative bias voltage is selected, based on Franz-Keldysh effect, Free carrier plasma effect, and Inter-valence band absorption, from a range of voltages for which an optical loss of the intrinsic semiconductor core is lower than an optical loss at zero bias for a selected wavelength range.
Dependencies are inferred from the claim text.