Electro-optic modulator is the key device to modulate continuous laser signal using data, radio frequency and clock signals. Different structures of modulator have different functions. Through the optical modulator, not only can the intensity of light wave be changed, but also the phase and polarization state of light wave can be modulated. The most commonly used electro-optic modulators are Mach-Zehnder intensity modulators and phase modulators.
The LiNbO3 intensity modulator is widely used in high-speed optical communication system, laser sensing and ROF systems because of well electro-optic performance. The R-AM series based on MZ push-pull structure and X-cut design, has stable physical and chemical characteristics, which can be applied both in laboratory experiments and industrial systems.
Modulator type
Wavelength：850nm/1064nm/1310nm/1550nmn
Bandwidth ：10GHz/20GHz/40GHz
Other: High ER Intensity Modulator/Cascading MZ Modulator /Dual-parallel MZ Modulator
Feature:
Low insertion loss
Low half-voltage
High stability
Application:
ROF systems
Quantum key distribution
Laser sensing systems
Side-band modulation
Requirements for high extinction ratio
1. System modulator must have high extinction ratio. Characteristic of system modulator decides the maximum extinction ratio can be achieved.
2. Polarization of modulator input light shall be taken care of. Modulators are sensitive to polarization. Proper polarization can improve extinction ratio over 10dB. In lab experiments, usually a polarization controller is needed.
3. Proper bias controllers. In our DC extinction ratio experiment, 50.4dB extinction ratio has been achieved. While the datasheet of the modulator manufacture only lists 40dB. The reason of this improvement is that some modulators drift very fast. Rofea R-BC-ANY bias controllers update the bias voltage every 1 second to ensure fast track response.
ROF has been focused on electro-optic integrated circuits and components for a decade. We manufacture high-performance integrated-optical modulators and provide innovative solutions and services for both scientific researchers and industry engineers. The modulators of the Rofea with low drive voltage and low insertion loss were primarily used in quantum key distribution, radio-over-fiber systems, laser sensing systems, and next-generation optical telecommunication.
We also provide many particular modulators for customization, such as 1*4 array phase modulators, ultra-low Vpi, and ultra-high extinction ratio modulators, primarily used in universities and institutes. Additionally, we also produce RF amplifier (modulator driver) and BIAS controller、photonics detector etc.
In the future, we will continue to improve the existing product series, to build a professional technical team, continue to provide users with high quality, reliable, advanced products and technical services.
Post time: Aug-10-2023