Optical Modulators
The DPSK series fiber optical modulator supports high-speed modulation up to 128 Gbps using the DP-QPSK (Dual-Polarization Quadrature Phase Shift Keying) transmission format. It integrates four independently driven Mach-Zehnder Interferometer (MZI) modulators—each with a low Vπ of 3.5 V, ~30 GHz bandwidth, dedicated DC bias ports, and monitor photodiodes for auto bias control—all in a single package. Two MZI pairs form dual I/Q modulators for the X and Y polarizations. A single-polarization CW laser is input into the device, split into two orthogonal polarization paths, modulated independently, and then recombined into a dual-polarization optical output. The system achieves 128 Gbps by combining a 30 Gbaud symbol rate, QPSK modulation (2 bits per symbol), and dual-polarization, effectively utilizing all four MZIs to deliver a 4× data rate increase over a single-modulator setup.
Configuration options
Configure the options below and add your exact build to the enquiry — we confirm the part number and availability.
Part number: DPSK-51115111
Wavelength: 1550 nm · Auto Bias Controller: Non · Connector: Non · RF Amplifier: Non · Input Fiber: PM1550 · Output Fiber: SM28 · Benchtop: None · RF Connector: GPPO
Application context
Application guidance is tied to the configured wavelength, fiber interface and optical-budget fields for this family.
Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps: Optical modulation depends on preserving the optical budget through the complete path. The 1550 nm wavelength specification sets source and detector compatibility. The fiber/interface entry (Non, FC/APC) must match the connected components.
Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps: Time-resolved measurement depends on preserving the optical budget through the complete path. The 1550 nm wavelength specification sets source and detector compatibility. The fiber/interface entry (Non, FC/APC) must match the connected components.
System integration
Use these checks to connect Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps to the surrounding optical, mechanical and control system. Every value shown is taken from this model's own specification record.
Technical FAQ
Connector: Non, FC/APC · Input Fiber: PM1550. Specify connector polish and fiber architecture together. FC/PC, FC/APC and SMA interfaces, and single-mode, multimode and polarization-maintaining fibers, impose different return-loss, mode-field and alignment requirements.
Wavelength: 1550 nm. Check the Optical Modulators passband, insertion loss, return loss and power handling at the actual source wavelength; a nominal telecom-band label is not a substitute for the configured range.
Auto Bias Controller: Non, Yes. Match supply voltage, analog or digital command range, connector pinout and default optical state to the instrument interlock. Confirm the unpowered state explicitly — it decides what happens to the link on a power failure.
Share your wavelength, fiber type, connector, power handling and control requirements and we will qualify the matching configuration and part number.
Model selection
Compare Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps with the closest available models in the Optical Modulators family. Confirm option-dependent values on the final configuration before ordering.
| Selection parameter | Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps (current) | DC-50kHz Compact Driver for NanoSpeed™ Variable Optic Attenuator | Fiber Optical Phase Modulator 1060nm - 20GHz |
|---|---|---|---|
| Wavelength range | 1550 nm | Confirm for this model | 1060nm |
| Optical performance | Confirm for this model | Confirm for this model | Confirm for this model |
| Fiber type | Confirm for this model | Confirm for this model | Confirm for this model |
| Connector / control | Non, Yes | Confirm for this model | FC/APC, FC/PC, Special |
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