Thorlabs Piezo-Based Fiber Phase Shifters alter the optical phase of visible to NIR light by stretching the fiber going through the devices. Newly released low-loss phase shifters produce a phase stroke of about 27.5λ (55π), 54.5λ (109π), or 67.5λ (135π) at 150 V and operate with input frequencies as high as 20 kHz.
The high phase shift allows for fine and coarse tuning, and the narrow resonant frequency enables the user to drive the device up to 20 kHz with stable temperatures. These are fiber-coil-based devices that, by maintaining a large fiber bend radius, can offer very low insertion losses of <0.05 dB or <0.08 dB, and are well-suited for quantum computing applications such as fiber link stabilization.
Features:
- Phase Shifts Up to 67.5λ (135π radians)
- Wavelength Ranges from 600 to 1625 nm
- Ultra-Low Insertion Loss of <0.05 dB or <0.08 dB (Without Connectors)
- SM and PM Fibers
- Compact Housing
- FC/APC Narrow Key Connectors
Figure G1.1 An FVP155 Phase Shifter is controlled by a KPC101 K-Cube® Piezo Controller.
Low-loss Phase Shifters Features
- Phase Shifts Up to 3.5λ (7π radians), 6.5λ (13π radians), 27.5λ (55π radians), 54.5λ (109π radians), or 67.5λ (135π radians)
- Input Drive Frequencies Up to 20 kHz
- Models for Input Wavelengths from 600 to 1625 nm
- Use in Closed- or Open-Loop Configurations
- SM and PM Fiber Options
For the FVP78P(A), FVP155P(A), and FVP155 phase shifters, the fiber is fixed to both ends of a piezoelectric ceramic, which elongates and thus stretches the fiber via the piezoelectric effect (see Figure 1.1 below). For the FVP63L(P), FVP78L(P), and FVP155L(P) phase shifters the fiber is wrapped around a piezoelectric tube, which elongates the fiber as the tube expands radially (see Figure 1.2). The coil configuration allows for larger phase shifts by integrating longer sections of fiber, while minimizing the insertion loss by ensuring a low-bend-loss architecture.
These phase shifters can be controlled by many of Thorlabs' piezo controllers via the SMC input on the devices. All phase shifters are also equipped with a thermal switch to prevent damage to the device under high temperatures.
Fiber phase shifters are versatile devices with applications in numerous fields. By precisely controlling and modulating the phase of the input optical signal, they enable high-precision measurements, sensing, and laser technologies. Figure 1.3 shows a schematic for integrating the FVP155 into a fiber interferometer to stabilize the path length.
Figure 1.1 Schematic of the FVP78P(A), FVP155P(A), and FVP155 Piezo-Based Fiber Phase Shifters
Figure 1.2 Schematic of the FVP155L and FVP155LP Low-Loss Piezo-Based Fiber Phase Shifters
Figure 1.3 Our Piezo-Based Fiber Phase Shifters can be integrated into a fiber interferometer to stabilize the path length using a KPC101 K-Cube® piezo controller. FOC = Fiber Optic Coupler, PC = Polarization Controller, PD = Photodetector.
Applications
- Fiber Optic Communication Systems:
- Phase Modulation
- Wavelength Division Multiplexing (WDM)
- Interferometric Sensors
- Optical Coherence Tomography (OCT)
- Stabilization of Interferometers
- Q-Switching and Mode-Locking in Fiber Laser Systems
- Optical Testing and Measurement
- Interferometry
- Optical Delay Lines
- Quantum Optics and Quantum Communication
- Quantum Key Distribution (QKD)
- Quantum Computing
- Generation of Entangled Photons
