Optical Modulators

Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps

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.

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Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps

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Configure the options below and add your exact build to the enquiry — we confirm the part number and availability.

WavelengthAuto Bias ControllerConnectorRF AmplifierInput FiberOutput FiberBenchtopRF Connector

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

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Integration and compatibility

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.

Optical interface and fiber: 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 and loss budget: 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.
Control interface: 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.

Technical FAQ

Integration questions for Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps

Which fiber and connector does the Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps use?

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.

How should the Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps be included in an optical power budget?

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.

Does the Fiber Optical DP-QPSK (I-Q) Modulator 128Gbps require a controller?

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.