scholarly journals The Design of 50 GHz Gallium Arsenide Electro-Optic Modulator Arrays for Satellite Communications Systems

2021 ◽  
Vol 9 ◽  
Author(s):  
Robert Graham Walker ◽  
Yi Zhou
Keyword(s):  
Low Frequency ◽  
Satellite Communications ◽  
Data Link ◽  
High Modulation ◽  
Electro Optic ◽  
Directional Change ◽  
Optical Configuration ◽  
Voltage Swing ◽  
Space Data ◽  
Electro Optic Modulator

Considerations are presented for the design of GaAs traveling-wave electro-optic modulator arrays for space data-link applications. Central to the modulator design is a low loss folded optical configuration giving direct, straight-line radio frequency (RF) access at one end of the device, with all fiber-optical ports at the opposite end. This configuration is a critical enabler for the close-packed monolithic modulator arrays needed for multi-channel applications. It also leads to much more compact packaging, improved fiber handling and contributes to high modulation bandwidths with low ripple by eliminating directional change in the RF feed arrangements. Both single Mach-Zehnder (MZ) and monolithic dual-parallel (IQ) modulators have been assessed up to 70 GHz, with bandwidths around 50 GHz achieved with a low-frequency ON/OFF voltage swing (Vπ) of 4.6 V (a voltage. length product of 8.3 Vcm). The folded devices can be significantly more compact than conventional ‘straight in-line’ modulators, while a modest array of devices (e.g., ×4) can be accommodated in a package of similar dimensions to a single modulator. Design considerations for monolithic arrays of independently addressed MZ modulators (each with its own input fiber) are discussed and practical configurations proposed.

Optimization of Frequency Modulation Spectral Lineshape Influenced by the Residual Amplitude Modulation Based on the Low Frequency Control of Electro-Optic Modulator

2012 ◽  
Vol 32 (3) ◽  
pp. 0330001
Author(s):  
张永智 Zhang Yongzhi ◽  
李志新 Li Zhixin ◽  
闫晓娟 Yan Xiaojuan ◽  
王乐 Wang Le ◽  
胡志裕 Hu Zhiyu ◽  
...  
Keyword(s):  
Amplitude Modulation ◽  
Frequency Modulation ◽  
Frequency Control ◽  
Low Frequency ◽  
Spectral Lineshape ◽  
Electro Optic ◽  
Residual Amplitude Modulation ◽  
Electro Optic Modulator

Electro-Optic Modulator for Compensation of Third-Order Intermodulation Distortion Using Frequency Chirp Modulation

2020 ◽  
Vol E103.C (11) ◽  
pp. 653-660
Author(s):  
Daichi FURUBAYASHI ◽  
Yuta KASHIWAGI ◽  
Takanori SATO ◽  
Tadashi KAWAI ◽  
Akira ENOKIHARA ◽  
...  
Keyword(s):  
Intermodulation Distortion ◽  
Frequency Chirp ◽  
Third Order ◽  
Chirp Modulation ◽  
Electro Optic ◽  
Electro Optic Modulator

Velocity matching of III-V travelling-wave electro-optic modulator structures

1990 ◽  
Vol 26 (1) ◽  
pp. 32-33 ◽  
Author(s):  
M.R.T. Tan ◽  
I. Kim ◽  
J. Chang ◽  
S.Y. Wang
Keyword(s):  
Travelling Wave ◽  
Electro Optic ◽  
Velocity Matching ◽  
Electro Optic Modulator

scholarly journals A New Method to Verify the Measurement Speed and Accuracy of Frequency Modulated Interferometers

2021 ◽  
Vol 11 (13) ◽  
pp. 5787
Author(s):  
Toan-Thang Vu ◽  
Thanh-Tung Vu ◽  
Van-Doanh Tran ◽  
Thanh-Dong Nguyen ◽  
Ngoc-Tam Bui
Keyword(s):  
Phase Change ◽  
High Speed ◽  
Measurement Accuracy ◽  
Slow Motion ◽  
New Method ◽  
Virtual Displacement ◽  
Electro Optic ◽  
Lock In ◽  
Speed And Accuracy ◽  
Electro Optic Modulator

The measurement speed and measurement accuracy of a displacement measuring interferometer are key parameters. To verify these parameters, a fast and high-accuracy motion is required. However, the displacement induced by a mechanical actuator generates disadvantageous features, such as slow motion, hysteresis, distortion, and vibration. This paper proposes a new method for a nonmechanical high-speed motion using an electro-optic modulator (EOM). The method is based on the principle that all displacement measuring interferometers measure the phase change to calculate the displacement. This means that the EOM can be used to accurately generate phase change rather than a mechanical actuator. The proposed method is then validated by placing the EOM into an arm of a frequency modulation interferometer. By using two lock-in amplifiers, the phase change in an EOM and, hence, the corresponding virtual displacement could be measured by the interferometer. The measurement showed that the system could achieve a displacement at 20 kHz, a speed of 6.08 mm/s, and a displacement noise level < 100 pm//√Hz above 2 kHz. The proposed virtual displacement can be applied to determine both the measurement speed and accuracy of displacement measuring interferometers, such as homodyne interferometers, heterodyne interferometers, and frequency modulated interferometers.

Optical two-tone generation and SSB modulation using electro-optic modulator with suppressing redundant spectrum components

2011 ◽  
Vol 3 (3) ◽  
pp. 295-300 ◽  
Author(s):  
Akira Enokihara ◽  
Tadashi Kawai ◽  
Tetsuya Kawanishi
Keyword(s):  
Input Power ◽  
Intensity Level ◽  
Optical Signals ◽  
Single Sideband ◽  
Electro Optic ◽  
Rf Signals ◽  
Frequency Components ◽  
Optical Single Sideband ◽  
Tone Generation ◽  
Electro Optic Modulator

Doubled frequency optical two-tone generation and optical single sideband (SSB) modulation by the dual-electrode-type electro-optic (EO) modulator with a single Mach–Zehnder (MZ) interferometer were considered. We theoretically showed that redundant spectrum components in the modulated optical signals, which are caused by the imbalance of light splitting ratio between the two arms of the interferometer, are significantly suppressed by controlling the input power ratio of RF modulation signals applied to each electrode. This effect was confirmed by the experiment, where an optical two-tone with the redundant components 49.8 dB lower than the primary two-tone components in intensity level was obtained. This method is also valid for suppression of undesired frequency components of RF signals that are generated at a photo detector from the optical two-tone waves propagated through a dispersive optical fiber.

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