Rof Electro-optic modulator Ultra High Precision MZM modulator Automatic Bias Controlle

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.