CORX is a 20/40/60 GHz dual-polarisation IQ receiver with built-in LO and TIA. Perfect for QPSK, 16-QAM, and DWDM signal analysis. Acts as a complete optical interface for real-time oscilloscopes, enabling precise IQ demodulation of high-speed coherent signals. Supports QPSK, 8-PSK, 16-QAM, and higher-order formats for validating complex modulation schemes in research and development. Used for measuring output quality, IQ skew, phase noise, and linearity of optical transmitters and modulators. Enables real-time signal capture and post-processing for testing DSP algorithms in coherent receivers and digital back-ends.

Bandwidth Variants

• 20 GHz, 40 GHz, 60 GHz (user selectable at time of order)

RF Specifications

• Low Frequency Cutoff: 1 MHz

• RF Output Swing: 600 mV

• Output Impedance: 50 Ohm

• Total Harmonic Distortion (THD): <5%

• RF CMRR: -20 dBe

• IQ Skew: ±3 ps

• XY Polarisation Skew: ±5 ps

Optical Specifications

• Wavelength Range: 1528 – 1568 nm (C-Band)

• Polarisation Extinction Ratio (PER): >17 dB

• Return Loss (at 1550 nm): 27 dB

• Responsivity: 0.035 A/W

• Variable Optical Attenuator (VOA): 10 dB

Local Oscillator Specs

• Frequency Range: 190.70 – 196.65 THz

• Linewidth: <100 kHz (25 kHz typical)

• Frequency Accuracy: ±0.3 GHz over 24 hours

• Output Power: 10–16 dBm

• Fibre Type: PM PANDA with PER > 20 dB

Connectivity & Control

• Interfaces: USB, Ethernet

• Control: SCPI commands, Built-in web server

• GUI: Web browser GUI (Chrome, Firefox, Edge)

Mechanical & Electrical

• Dimensions: 365 × 45 × 275 mm

• Weight: 3 kg

• Power Supply: 100–240 VAC, 1A, 50/60 Hz

Power Consumption: 80W

High-Bandwidth Dual-Polarisation Reception

• Available in 20 GHz, 40 GHz, and 60 GHz bandwidth versions
  
• Dual polarisation support for full IQ demodulation
  
• Excellent phase accuracy with ±3 ps IQ skew and ±5 ps XY skew
  

Ideal for characterising modulated signals with high spectral efficiency in real time.

Built-In Tunable Local Oscillator (LO)

• C-Band LO: 190.70–196.65 THz (1528–1568 nm)
  
• Linewidth: <100 kHz (25 kHz typical)
  
• Output Power: 10–16 dBm, fine-tuned in 1 MHz steps
  
• Polarisation-maintaining PANDA fibre (PER > 20 dB)
  

This integrated LO simplifies coherent mixing without needing external laser sources.

Integrated Transimpedance Amplifiers (TIAs)

Each IQ output channel features a high-speed TIA with:

• 600 mV RF output swing
  
• 50 Ohm output impedance
  
• Low distortion: <5% THD
  
• Support for low-power signals
  

Connect directly to high-bandwidth oscilloscopes or digitizers.

Web-Based GUI & Remote Automation

• Browser-based GUI accessible via Ethernet
  
• USB and Ethernet control with SCPI command compatibility
  
• No external software needed
  
• Easy integration into automated test benches using Python, LabVIEW, MATLAB
  

Compact, Rack-Mountable Design

• 1U (1HE) chassis: 365 x 45 x 275 mm
  
• Weight: 3 kg
  
• Fits standard 19” racks – perfect for labs, universities, and telecom testbeds
  

Optical Front-End for Real-Time Oscilloscopes

Provides a complete coherent receiver interface for high-speed scopes:

• Enables phase- and amplitude-resolved signal capture
  
• Suitable for QPSK, 8-PSK, and 16-QAM signal analysis
  
• High output fidelity for precise DSP recovery
  

DWDM Transmission and Receiver Testing

Use CORX to validate:

• Multi-channel DWDM links
  
• Coherent detection and demodulation schemes
  
• Channel selectivity and frequency accuracy
  

Its built-in LO and wide C-band tuning range support channel-by-channel DWDM validation.

Advanced Modulation Format Testing

• Full IQ signal separation and linear output response
  
• Ideal for modulation format development and BER analysis
  
• Supports lab-grade and production testing environments

Reference Receiver for Optical Component Characterisation

Perfect for:

• Testing optical IQ modulators, DACs, filters, and amplifiers
  
• Measuring signal-to-noise ratio, linearity, and response bandwidth
  
• Ensuring compliance with coherent interface standards
  

DSP Algorithm Development & Validation

• Supports DSP simulation and real-time validation
  
• Ideal for algorithm refinement in coherent receivers and digital back-ends
  

Use in academic and industrial research to accelerate innovation in signal recovery.

• Wide bandwidth options (20 / 40 / 60 GHz)
• Integrated tunable LO – no need for external laser
• Built-in TIAs – clean and amplified signal outputs
• Browser-based GUI & SCPI for remote control and automation
• 1U compact design with full C-band coverage
• Backed by United Spectrum Instruments’ support in India