20 GHz/40 GHz Lightwave Transmitter, Legacy Product (LT-20/40)

Data Sheet

Product Overview

The Optilab LT-20/40 is a 20 GHz/40 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 broadband Lithium Niobate (LiNbO3) optical modulator is employed to provide the linear modulation capability that exceeds 20 GHz in its modulation bandwidth, and the externally modulated transmitter design provides a high spur-free dynamic range and high input intercept point performances. The low drive series of transmitters offers superior Vπ values for increased E/O conversion efficiency. The LT-20/40 can be utilized for digital transmission when driven by a wideband modulator driver, and can be paired with the LR-30 /45series of 30 GHz/ 45 GHz 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 20 GHz/ 40 GHz Bandwidth
  • High Dynamic Range with low RIN Source Laser
  • Highly Linear for Analog Transmission
  • RS-232 Monitor Interface
  • Broadband LiNbO3 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 20 GHz
Optical Output Level +4 dBm to +6 dBm
Optical Return Loss 50 dB typ.
Linewidth (FWHM) 1 MHz max.
DFB Side Mode Suppression Ratio 50 dB typ.
Relative Intensity Noise (RIN) -145 dB/Hz max.
Impedance 50 Ω
Frequency Response Flatness ±0.5 dB in any 1 GHz bandwidth
VSWR 2.0 : 1 max.
Input Damage Level 26 dBm max.
Link Performance with PD-30
SFDR 113 dB Hz2/3
Link Loss -20 dB @ 10 dBm optical
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 K Connector Female, 50 Ω
DC Connector DB-15
Local Alarm LED: Optional Input Power
Remote Alarms RS-232 Interface
Dimensions 208 mm x 108 mm x 30 mm
Accessories Included 110 V - 240 V AC Adaptor & Cable
Housing Precision Mach. Anodized Aluminum

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