A0020A Laser Linewidth Measurement System
A delayed self-heterodyne system for measuring laser diode linewidth, combining a SYCATUS test set with a Keysight X-Series signal analyzer. SYCATUS states a minimum measurable linewidth of 40 kHz.
Technical overview
The SYCATUS test set contains a delayed self-heterodyne interferometer followed by a high-gain linear optical receiver, with a polarization controller inside the interferometer to set the interference condition. The interferometer output is read by a Keysight X-Series signal analyzer, from which SYCATUS states 3 dB, 10 dB and 20 dB linewidth figures are obtained directly. Interferometer and optical receiver are housed in one box, and the delay fibre length, wavelength band and minimum linewidth are set by ordering option.
Features
- Laser linewidth measurement down to 40 kHz
- Wide wavelength range covering both C and L bands
- Interferometer and optical receiver in one box
- Essential measurement for lasers used in digital coherent systems
- Linewidth measured at 3 dB, 10 dB and 20 dB bandwidth obtained easily via the signal analyzer
Specifications
| Parameter | Value |
|---|---|
| Optical wavelength | 1520 to 1620 nm |
| Minimum measurable linewidth | 40 kHz |
| Optical input power range | -20 to +7 dBm |
| Frequency shift of interferometer, typ. | 100 MHz |
| Optical wavelength range options (datasheet) | 1520 - 1620 nm, 1260 - 1360 nm, or 1260 - 1620 nm nm |
| Minimum linewidth frequency options (datasheet) | 40 kHz or 10 kHz kHz |
| Delay fibre length of interferometer (datasheet) | 5 km or 20 km km |
Applications
- Linewidth characterization of laser diodes for digital coherent transmission systems
- Development, manufacturing and quality control of lasers for optical communications
- Evaluation of ITLA and other integrated laser sources, including noise introduced by laser conditioning electronics
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