Piezo-Based Fiber Phase Shifters

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Figure G1.1  An FVP155 Phase Shifter is controlled by a KPC101 K-Cube® Piezo Controller.

• Phase Shift Ranges:
  • FVP78P: Up to 6.5λ (13π Radians)
  • FVP155P: Up to 3.5λ (7π Radians)
  • FVP155: Up to 6.5λ (13π Radians)
• Input Wavelength Ranges:
  • FVP78P: 770 - 1100 nm
  • FVP155P: 1290 - 1625 nm
  • FVP155: 1310 - 1550 nm
• FC/PC Narrow Key Connectors
• SM and PM Fiber Options

The FVP155P phase shifter can produce a phase stroke of about 3.5λ (7π) while the FVP78P and FVP155 phase shifters can produce a phase stroke of about 6.5λ (13π) when driven at 150 V and operate with input frequencies as high as 20 kHz while maintaining a phase stroke of at least λ (2π). Note that the connectors on each device are narrow key FC/PC (2.0 mm) and that the phase shifters can be clamped to an optical table using a CL6 clamp, if needed.

These phase shifters are also equipped with a thermal switch to prevent damage to the device under high temperatures. When the device overheats, the circuit will be broken, and it will automatically reconnect when the temperature drops to around 50 °C. Since the device heats up faster when modulated at higher frequencies, we provide a list of recommended maximum voltages as a function of frequency to prevent overheating in Table 2.2 in the Specs tab, for reference.

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Figure G2.1  These phase shifters (Item # FVP155PA shown) have their Item # and wavelength range engraved on the housing.

• Phase Shift Ranges:
  • FVP78PA: Up to 6.5λ (13π Radians)
  • FVP155PA: Up to 3.5λ (7π Radians)
• Input Wavelength Ranges:
  • FVP78PA: 770 - 1100 nm
  • FVP155PA: 1290 - 1625 nm
• PM Fiber with FC/APC Narrow Key Connectors

The FVP78PA and FVP155PA phase shifters can produce phase strokes of about 6.5λ (13π) and 3.5λ (7π), respectively, when driven at 150 V and operate with input frequencies as high as 20 kHz while maintaining a phase stroke of at least λ (2π). Note that the connectors on each device are narrow key FC/APC (2.0 mm) and that the phase shifters can be clamped to an optical table using a CL6 clamp, if needed.

These phase shifters are also equipped with a thermal switch to prevent damage to the device under high temperatures. When the device overheats, the circuit will be broken, and it will automatically reconnect when the temperature drops to around 50 °C. Since the device heats up faster when modulated at higher frequencies, we provide a list of recommended maximum voltages as a function of frequency to prevent overheating in Table 2.2 in the Specs tab, for reference.

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Figure G3.1  The FVP155L and FVP155LP include an SMC connector for an external controller.

• Phase Shifts Up to 27.5λ (55π Radians)
• Input Wavelength Ranges:
  • FVP155L: 1260 to 1625 nm, SM
  • FVP155LP: 1440 to 1625 nm, PM
• Ultra-Low Insertion Loss of <0.05 dB (Without Connectors)
• Compact Housing
• FC/APC Narrow Key Connectors

The FVP155L and FPV155LP low-loss phase shifters can produce a phase stroke of about 27.5λ (55π) at 150 V and operates 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 and are well-suited for quantum computing applications such as fiber link stabilization.

The FVP155L uses SMF-28 Ultra fiber with an operating range of 1260 nm to 1625 nm and offers a low polarization dependent loss (<0.01 dB), suitable for applications where input light polarization can vary. The FVP155LP uses PM1550-XP fiber with an operating range of 1440 nm to 1625 nm and offers >18 dB polarization extinction ratio for applications that require maintaining a linear light polarization throughout the fiber setup.