MICROWAVE FREQUENCY RANGE ELECTRO-OPTIC MODULATOR WITH EFFICIENT INPUT COUPLING AND SMOOTH WIDEBAND FREQUENCY RESPONSE
Assignee
HUGHES AIRCRAFT COMPANY, LOS ANGELES, CA A DE CORP.
Filed
Mar 30, 1990
Granted
May 4, 1993
Location
CHATSWORTH CA US
Abstract
A travelling-wave Mach-Zehnder electro-optic modulator (10) for operation at microwave electrical input signal frequencies has an electrical modulation electrode structure (26,34) which constitutes a coplanar waveguide (24). An electrical input signal connector (80) is coupled to a microstrip line (38) having an output impedance which is significantly different from the input impedance of the waveguide (24). A Chebyshev impedance matching transformer (50) couples the input signal from the input connector (80) to the modulation electrode structure (26,34), while matching the output impedance of the microstrip line (38) to the input impedance of the waveguide (24) to maximize the coupling efficiency and minimize return loss. The modulator (10) is mounted on a block (70) of magnetically loaded epoxide material which absorbs spurious resonant microwave emissions, and enables the modulator (10) to operate with smooth frequency response over a wide range of microwave input frequencies.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Sep 21, 1990
Rescinded
Aug 6, 1992
Duration
1 year, 10 months
Inventor
- 1JAMES H. SCHAFFNER
Record Details
- Patent number
- US 5208697
- Application
- 07502377
- Aerospace match
- Yes
- Dataset source
- 35 USC §181 SO records
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