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Help CenterRof Electro-optic Modulator Ultra High Precision MZM Modulator Automatic Bias Controlle
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Ultra-High Precision MZM Bias Controller
Introduction
Rofea's modulator bias controller is specially designed for Mach- Zehnder modulators to ensure a stable operation state in various operating environments. Based on its entirely digitized signal processing method, the controller can provide ultra-stable performance. The controller injects a low frequency, low amplitude dither signal together with bias voltage into the modulator. It keeps reading the modulator's output and determines the bias voltage condition and the related error. A new bias voltage will be applied afterward according to the previous measurement. In this way, the modulator is ensured to work under a proper bias voltage.
Feature
•Bias voltage control on Peak/Null/Q+/Q−
•Bias voltage control on an arbitrary point
•Ultra precise control:
1. 50dB maximum extinction ratio on Null mode
2. ±0.5◦ accuracy on Q+ and Q− modes
•Low dither amplitude:
1. 0.1% Vπ at NULL mode and PEAK mode
2. 2% Vπ at Q+ mode and Q− mode
•High stability: with fully digital implementation
•Low profile: 40mm(W) × 30mm(D) × 10mm(H)
• Easy to use:
1. Manual operation with a mini jumper
2. Flexible OEM operations through MCU UART2
•Two different modes to provide bias voltage:
a.Automatic bias control
b.User-defined bias voltage
Application
• LiNbO3 and other MZ modulators
• Digital NRZ, RZ
• Pulse applications
• Brillouin scattering system and other optical sensors
• CATV Transmitter
1 The highest extinction ratio depends on and cannot exceed the modulator maximum extinction ratio.
2 UART operation is only available on some versions of the controller.
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