Coherent or interferometric sensor systems, such as distributed acoustic sensors (DAS), often require a low loss, low-cost phase shifter or modulator to obtain the desired sensing signals. LUNA’s 2nd generation all fiber phase shifter/modulator provides phase shifts up to 65π with a much lower half-wave voltage (~2 volts as compared with 10-20 volts for the 1st generation phase shifter) at frequencies from DC to 20 kHz. The all fiber construction results in low insertion loss and back reflection. In addition to fiber sensor systems, this compact device is ideal for fiber laser systems, fiber resonators, and fiber interferometers for precision phase tuning or phase modulation.
Figure 2 : typical performance for FPS-002 with 1550nm
SM fiber in small frame (top) and large frame (bot).
Figure 1 : FPS-002 Fiber Phase Shifter
Key Features
• All-fiber optical path
• Low half-wave voltage
• Large phase shift range
• Compact
• Low insertion loss
• Low residual amplitude modulation
• Low PDL
• Low cost
Applications
• Fiber interferometers
• Fiber laser systems
• Fiber sensor systems