US 11,947,239 B2
Optical driver with active boost
Craig S. Appel, Macungie, PA (US); and Peter C. Metz, Macungie, PA (US)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Aug. 18, 2022, as Appl. No. 17/820,747.
Application 17/820,747 is a continuation of application No. 16/746,843, filed on Jan. 18, 2020, granted, now 11,454,856.
Prior Publication US 2022/0390807 A1, Dec. 8, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G02F 1/225 (2006.01); G02F 1/01 (2006.01); G02F 1/025 (2006.01); G02F 1/21 (2006.01)
CPC G02F 1/225 (2013.01) [G02F 1/0123 (2013.01); G02F 1/025 (2013.01); G02F 1/212 (2021.01)] 20 Claims
OG exemplary drawing
 
1. An electrical integrated circuit, comprising:
a frequency comparator configured to determine operational characteristics of an electrical circuit connected to an optical modulator; and
an electrical driver configured to drive a phase shift of a first optical signal carried on a first arm of the optical modulator relative to a second optical signal carried on a second arm of the optical modulator, the electrical driver comprises:
an inverting buffer having a fixed gain inverter, an adjustable gain inverter, and a non-inverting amplifier, and
wherein an amplification strength of the adjustable gain inverter is adjustable and set based on the operational characteristics, and wherein a driving voltage that is applied to the adjustable gain inverter, the fixed gain inverter, and the non-inverting amplifier is adjustable and set based on the operational characteristics, and wherein the non-inverting amplifier is arranged to boost an input signal to the fixed gain inverter and the adjustable gain inverter.