Quad 40 GHz Modulator Driver/RF Amplifier (MD-40-X4-R)

Data Sheet

Product Overview

The MD-40-X4-R is a quad channel, 40 GHz Bandwidth RF Amplifier, enclosed in a single 1U rackmount housing.  Each channel on the MD-40-X4-R provides a high-quality, single-ended voltage to drive an external LiNbO3 modulator, with independent control and monitoring on all amplified signals. Typical applications include driving EML, EAM, and Mach-Zehnder modulators, and amplifies 50 Gb/s data input signals to >7.5 Vp-p drive levels. The MD-40-X4-R flat gain and flat group delay response yields a high-quality, low-jitter electrical drive signal, that can also be used as a wideband RF amplifier with useful bandwidth of up to 40 GHz. Its high gain of 27 dB makes it suitable for many RF link applications, and is a perfect match to Optilab’s extensive optical transmitter catalog, with remote accessibility via a single USB port. Contact Optilab for more information.


  • 50 Gb/s digital modulation
  • OC-768 SONET/SDH
  • Analog RF amplification to 40 GHz
  • RF over Fiber Link Amplifier
  • General laboratory testing


  • Quad Channel Driver/Amplifier
  • Analog bandwidth exceeds 40 GHz
  • Data rates up to 50 Gb/s
  • Dual Independent RF Channels
  • Variable Gain Control built-in
  • 2.4 mm connectors (optional K)
  • Remote control via USB

Feature Name Description
General Specifications
3dB S21 Bandwidth 32 GHz min.
S11 Characteristics < -8 dB @ 40 GHz
Saturated Output Power >21 dBm typ.
RF Gain 27 dB available
Gain Ripple ±2.5 dB over 2GHz
Input, Output Impedance 50 Ω
Input Return Loss 10 dB typ.
Output Return Loss 10 dB typ.
Total Power Dissipation 2 W max.
Gain Adjustment Range 10 dB min.
Digital Application
Data Rate > 40 Gb/s
Pulse Response 20%~80%, rise time 12 ps typ.
Output Amplitude 7.5 Vp-p typ.
Input Range 500 mV to 1.5 V
Analog Applications
Useful Frequency Range 30 KHz to 38 GHz
P1dB Output > 23 dBm max.
Group Delay (2 to 10 GHz) ± 25 ps
Noise Figure 11 dB
Small Signal Gain 30 dB typ.
Mechanical Specifications
Operating Temperature 0° C to +60° C
Storage Temperature -40° C to +85° C
Operating Humidity 85%
Power Supply Requirements 110/220 V AC, 50/60 Hz
Accessories Included AC Power Cord, USB Cord
RF Input/Output Connector 2.4 mm (V), K-Connector Optional
Remote Control USB port
Display Output Dual LCD