The Advantest Q7606B is an optical chirpform test set designed to measure and analyze chirp (frequency-modulated) and intensity-modulated components of laser light across the 1510 nm to 1590 nm wavelength range. Operating in conjunction with a digital sampling oscilloscope, personal computer, and GPIB interface, the instrument separates incident optical signals into modulation constituents using dual fiber-type Mach-Zehnder interferometers. Switchable output modes deliver either the sum (IM+FM) or difference (IM-FM) of modulation components, enabling time-domain analysis of optical device performance.
The Q7606B accepts optical input power from −20 dBm to +10 dBm and operates across a demodulation bandwidth of 100 Hz to 50 GHz. Automatic polarization compensation ensures measurement accuracy across the full operating range. Typical measurement cycles complete in 30 seconds or less with ±5% repeatability. Insertion loss remains 10 dB or less, and demodulation frequency resolution is specified at 20 MHzp-p or better.
Technical Specifications
• Wavelength range: 1510 nm to 1590 nm
• Input optical power: −20 dBm to +10 dBm
• Free spectral range: 150 GHz ±15 GHz
• Demodulation bandwidth: 100 Hz to 50 GHz
• Demodulation frequency deviation: 65 GHzp-p or less
• Demodulation frequency resolution: 20 MHzp-p or less
• Insertion loss: 10 dB or less
• Optical output power: 0 dBm or higher (average) with automatic gain adjustment
• Measurement repeatability: ±5%
• Measurement time: 30 seconds or less
• Measurement frequency band: 50 GHz or greater
– Key Features
• Fiber-type Mach-Zehnder interferometer architecture
• Dual-mode output selection (IM+FM or IM-FM)
• Built-in automatic polarization compensator
• Time-domain chirp and intensity modulation analysis
• Fast measurement capability with high repeatability
– Typical Applications
• Optical transmitter characterization
• Laser chirp and modulation analysis
• Optical device performance evaluation
• High-speed modulation component separation
– Compatibility & Integration
Requires digital sampling oscilloscope, PC with Windows 95/98/NT 4.0 or later, GPIB board, and O/E converter with sufficient bandwidth. External optical amplifier may be required depending on O/E converter input power specifications. Compatible with pulse pattern generators and optional chirp measurement software.
