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Optical modulator with pre-determined frequency chirp

  • US 20030190107A1
  • Filed: 05/30/2003
  • Published: 10/09/2003
  • Est. Priority Date: 04/06/2000
  • Status: Abandoned Application
First Claim
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1. An optical modulator for producing a modulated optical output having a pre-determined frequency chirp comprising:

  • optical splitting means (2) for receiving and splitting an optical input signal to be modulated into two optical signals to pass along two waveguide arms (4,6) made of electro-optic material;

    optical combining means (8) for receiving and combining the two optical signals into said modulated optical output;

    at least one electrode pair (40, 42/44) associated with each waveguide arm (4, 6), said electrode pairs (40, 42/44) being electrically connected in series such as to modulate the phase of said optical signals in anti-phase in response to a single electrical signal (Vmod) applied thereto;

    characterised by a capacitive element (60, 62) connected to the electrode pair (42/44) of one arm (6) such as to modify the division of the single electrical signal (Vmod) such that the magnitude of the electrical signal across the electrode pair of one arm (6) is different to that across the electrode pair of the other arm (4) thereby imparting the pre-determined frequency chirp in the modulated optical output.

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