Frequency multiplying electro-optic modulator configuration and

Details Frequency multiplying electro-optic modulator configuration and Frequency multiplying electro-optic modulator configuration and

1990-04-20

1991-08-20

Lee, John D.

350 9615, G02B 610, G02F 200

Patent

active

050408658

ABSTRACT:
In a Mach-Zehnder electro-optic modulator (10), an optical waveguide (14) includes two branches (20,22) extending between an optical input (16) and an optical output (18) is formed in a substrate (12) of a material having electro-optical properties. An electrical signal applied to a modulation input (34) affects the material such that the effective optical lengths of the branches (20,22) vary differently in correspondence with the magnitude of the electrical signal. The optical signals propagating through the branches (20,22) interfere with each other at the optical output (18) at a phase angle depending on the difference between the effective optical lengths. A selected electrical bias voltage applied to the modulation input (34) causes non-linear modulation of an input optical signal with one or more even integral multiples of an electrical input signal which is additionally applied to the modulation input (34), thereby providing frequency multiplication. Two or more non-linearly operated modulators (50) may be connected in cascade to increase the multiplication ratio, with a photodetection (80) converting the optical output of one modulator to an electrical signal which is applied to the modulation input of the next modulator. One linearly operated modulator (100) may be connected in cascade with a non-linearly operated modulator to modulate a frequency multiplied carrier with a data signal. In an alternative configuration, the Mach-Zehnder modulator may be replaced by a directional coupler (130) adapted to produce frequency multiplication when operated non-linearly.

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