A very wide-band frequency response measurement system using optical heterodyne detection
- NTT Labs., Yokosuka-shi, Kanagawa 238 (JP)
The authors present a very wide-band frequency response measurement system for optical devices established using the optical heterodyne detection method utilizing two distributed feedback-laser diodes (DFB-LD's). By controlling the laser diode (LD) temperature, the beat frequency is swept from dc to beyond several tens gigahertz and the measurable bandwidth can be extended to that frequency without any additional calibration. In this system, the spectral linewidth of each LD is stabilized by the two-state optical isolator and the lightwaves are mixed with the same polarization by a polarization maintaining optical coupler. The optical frequency fluctuation of the LD is detected by the change of the transmitted optical power through Fabry-Perot etalon and the frequency is controlled by the negative feedback to the LD temperature. Included are a comparison of measurement methods, features of the developed measurement system, and the measurement results.
- OSTI ID:
- 5233264
- Journal Information:
- IEEE (Institute of Electrical and Electronics Engineers) Transactions on Instrumentation and Measurement; (USA), Vol. 38:2; ISSN 0018-9456
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
HETERODYNE RECEIVERS
PERFORMANCE
OPTICAL SYSTEMS
FREQUENCY MEASUREMENT
COMPARATIVE EVALUATIONS
FABRY-PEROT INTERFEROMETER
MEASURING METHODS
SEMICONDUCTOR DIODES
SEMICONDUCTOR LASERS
STABILIZATION
ELECTRONIC EQUIPMENT
EQUIPMENT
INTERFEROMETERS
LASERS
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
RADIO EQUIPMENT
SEMICONDUCTOR DEVICES
SOLID STATE LASERS
440600* - Optical Instrumentation- (1990-)
426002 - Engineering- Lasers & Masers- (1990-)