HIGHER ORDER OPTICAL PAM MODULATION USING A MACH-ZEHNDER INTERFEROMETER (MZI) TYPE OPTICAL MODULATOR HAVING A BENT OPTICAL PATH
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United States of America Patent
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Oct 5, 2017
app pub date -
Mar 29, 2016
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Mar 29, 2016
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Abstract
An optical modulator includes an optical waveguide including at least a first PN junction phase shifter and a second PN junction phase shifter. A driver circuit drives operation of the first and second PN junction phase shifters in response to a pulse amplitude modulated (PAM) analog signal having 2n levels. The PAM analog signal is generated by a digital to analog converter that receives an n-bit input signal. In an implementation, the optical waveguide and PN junction phase shifters are formed on a first integrated circuit chip and the driver circuit is formed on a second integrated circuit chip that is stacked on and electrically connected to the first integrated circuit chip.
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