3 GHz Lightwave Transmitter (LT-3)

Data Sheet

Product Overview

The Optilab LT-3-M is a 3 GHz bandwidth lightwave transmitter module output designed for RF over fiber, antenna remoting and broadband RF transmission applications using single mode optical fiber. This convenient, cost-effective module uses a low noise, narrow linewidth, 1550 nm distributed feedback (DFB) laser diode as Continuous Wave (CW) light source. A compact Mach-Zehnder Interferometer (MZI) optical modulator is employed to provide the linear modulation capability that exceeds 3 GHz in its modulation bandwidth, and the externally modulated transmitter design provides a high spur-free dynamic range and high input intercept point performances. With useful bandwidth up to 4 GHz, the LT-3-M can be utilized for digital transmission when driven by a wideband modulator driver, and can be paired with the LR-12-A series of 12 GHz amplified receivers for a high-speed RF over Fiber Link.


  • Wideband RF Transmission over Fiber
  • RF/IF Signal Distribution
  • Satcom microwave antenna signal distribution
  • EW Systems
  • Broadband delay-line and signal processing
  • Radar system calibration phased
  • Phased and interferometric array antenna


  • RFoF Transmitter with 3 GHz Bandwidth
  • High Dynamic Range with low RIN Source Laser
  • Highly Linear for Analog Transmission
  • RS-232 Monitor Interface (optional)
  • Compact MZI optical modulator
  • Housing limits RF and thermal interference

Feature Name Description
General Specifications
DFB Laser Wavelength 1550 nm ± 10 nm, Can be ordered w/ ITU wavelength
Operational Bandwidth 0.01 to 3.5 GHz
Optical Output Level +4 dBm to +6 dBm
Optical Return Loss 50 dB typ.
Linewidth (FWHM) < 3 MHz
DFB Side Mode Suppression Ratio 50 dB typ.
Relative Intensity Noise (RIN) -145 dB/Hz max.
Impedance 50 Ω
Frequency Response Flatness ±0.1 dB/100 MHz
Phase Flatness ±0.2 degree/100 MHz
Spurious Free Dynamic Range (SFDR) 110 dB-Hz2/3
VSWR 2.0 : 1 max.
Input Damage Level 23 dBm max.
Mechanical Specifications
Operating Temperature -40° C to +70° C
Storage Temperature -55° C to +85° C
Power Supply Requirements +12 V DC, 2 A max.
Optical Connector FC/APC, other optional
RF Input Connector SMA Connector Female, 50 Ω
DC Connector DB-15
Local Alarm LED: Optional Input Power
Remote Alarms RS-232 Interface
Dimensions 130 mm x 82 mm x 25 mm
Accessories Included 110 V - 240 V AC Adaptor & Cable
Housing Precision Mach. Anodized Aluminum

Product Requests and Consulting

If you would like more information about Optilab Products or Custom Solutions, please Submit a Product Request.

If you'd like to contact Optilab directly, you can reach a sales representative by email (JavaScript must be enabled to view this email address).