Multi-Terabit Optical Test Solution

The Multi-Terabit Optical Test Solution provides a complete, co-validated framework for testing ultra-high-capacity optical communication systems at data rates and channel densities that represent the current and near-future frontier of optical networking technology.

What is a multi-terabit optical test solution and who needs one? A multi-terabit optical test solution is a pre-integrated test platform that combines tunable laser sources, coherent optical transmitters, coherent receivers, and supporting measurement hardware into a validated system capable of generating, transmitting, and analysing optical signals at aggregate capacities of multiple terabits per second. It is needed by telecom equipment manufacturers validating 400G/800G coherent transceivers, hyperscale data centre operators testing terabit-class DCI links, academic research institutions studying advanced modulation formats and spectral efficiency, and defence organisations developing high-capacity secure optical communication systems.

What are the core instrument building blocks of this solution? The platform integrates instruments from across the United Spectrum / ID Photonics product family — CoBrite MX or DX series tunable lasers providing up to 48 independently controlled, sub-25 kHz linewidth carrier sources; OMFT dual-polarisation optical multi-format transmitters for generating DP-QPSK, DP-16QAM, and DP-64QAM signals; CORX coherent optical receivers with 20/40/60 GHz bandwidth for signal capture and analysis; and an ID OSA optical spectrum analyser for channel power, OSNR, and spectral shape characterisation across all active DWDM channels. Partner instruments from Keysight and Fraunhofer Institute technologies complete the platform.

How does co-validation with the Fraunhofer Institute strengthen the solution? The Fraunhofer Institute for Telecommunications is one of Europe’s most respected applied photonics research organisations, with direct involvement in the development and standardisation of coherent optical transmission technologies. Co-validation of the Multi-Terabit Test Solution with the Fraunhofer Institute means the platform’s measurement results have been confirmed against an independently recognised research reference — providing customers with confidence that the test data produced is accurate, reproducible, and credible in R&D publication, standards submission, and equipment qualification contexts.

Ultra-High-Capacity Transmission Testing

The platform supports characterisation and validation of optical links operating at data rates of up to 1.4 Tb/s per individual optical carrier — enabling testing of single-carrier 400G, 800G, 1.2T, and 1.6T systems as well as aggregate multi-carrier capacities that total tens of terabits per second across the full 200-channel DWDM grid. This makes it the highest-capacity optical test platform available through an Indian distributor, capable of addressing the most demanding next-generation coherent transmission validation requirements currently faced by telecom equipment manufacturers, hyperscale operators, and research institutions.

Massive DWDM Channel Density

With support for up to 200 simultaneous, independently controlled DWDM wavelength channels — each with its own tunable laser source, independent wavelength, and independent power level — the platform enables realistic emulation of fully loaded dense optical networks. This allows engineers to analyse inter-channel nonlinear effects (cross-phase modulation, four-wave mixing, stimulated Raman scattering), spectral efficiency under realistic channel loading conditions, EDFA gain and noise performance under full C-band load, and the impact of channel count on per-channel BER and Q-factor margin.

Modular and Scalable Architecture

The system is delivered in a starting configuration matched to the customer’s immediate requirements and can be expanded as testing needs evolve — adding laser cards to the CoBrite MX mainframe, upgrading the CORX receiver bandwidth, adding L-band coverage, or integrating additional partner instruments — without replacing the core platform. This modularity protects the initial capital investment while supporting long-term research and development roadmaps that may span multiple generations of optical network technology.

Turnkey Integrated Platform

All critical optical and electronic components — tunable lasers, coherent transmitters, coherent receivers, optical spectrum analyser, amplification chain, RF interconnects, and automation software — are integrated, aligned, and fully validated as a complete system before delivery. This eliminates the weeks of integration work, instrument-to-instrument calibration, and measurement consistency verification that customers would otherwise need to perform themselves when assembling a comparable test platform from individually sourced instruments.

Advanced Coherent Technology Support

The platform is specifically engineered for the coherent optical modulation formats deployed in and planned for commercial 400G/800G/1.6T networks: DP-QPSK, DP-16QAM, DP-64QAM, probabilistically shaped (PS) QAM, and Nyquist WDM. Sub-25 kHz laser linewidth from CoBrite N-type modules ensures that carrier phase noise does not limit measurement accuracy at high-order QAM formats. The CORX receiver’s 20/40/60 GHz bandwidth options support baud rates from 28 GBaud to beyond 120 GBaud within the same platform.

Automation and Repeatability

The platform’s control interfaces — Ethernet, USB, SCPI, and REST API — enable complete programmatic control of all instruments from Python, LabVIEW, MATLAB, and custom test automation frameworks. This supports fully automated test routines for systematic parameter sweeps (baud rate, launch power, channel count, modulation format), repeatable BER and Q-factor benchmarking, and high-throughput production-level testing where manual instrument interaction would be impractical.

Future-Ready Design

The modular architecture is designed to accommodate future increases in per-carrier data rate, channel count, and modulation complexity — including the transition from 400G to 800G, 1.6T, and beyond; the expansion from C-band to C+L-band and wideband operation; and the evolution of modulation formats toward higher spectral efficiency through probabilistic shaping and space-division multiplexing. Customers who invest in the Multi-Terabit Test Solution today are investing in a platform that will remain relevant and expandable for the next generation of optical network development.

Telecommunications Network Development

Telecom equipment manufacturers and network operators use the Multi-Terabit Test Solution for end-to-end validation of ultra-high-capacity DWDM systems at data rates that match or exceed planned network deployments. Specific applications include:

• Coherent transceiver qualification at 400G, 800G, and 1.6T line rates to OIF and ITU-T G.698.4 standards

• Multi-span fibre transmission system characterisation — measuring BER, Q-factor, OSNR margin, and dispersion tolerance across realistic multi-amplifier link configurations

• ROADM and wavelength-selective switch (WSS) performance evaluation under full 200-channel DWDM loading

• Interoperability testing between multi-vendor coherent transceivers in mixed-generation network environments

Optical Component and Subsystem Testing

The platform serves as a high-fidelity signal source and reference receiver for characterising individual optical components and subsystems under realistic transmission conditions that a simple laser-and-detector test cannot replicate:

• Tunable laser characterisation (linewidth, frequency accuracy, phase noise, RIN) under modulated signal conditions

• Optical modulator qualification (EVM, extinction ratio, chirp, bandwidth) with realistic DP-IQ modulation signals

• EDFA and Raman amplifier gain flatness, noise figure, and nonlinear performance characterisation under full DWDM channel loading

• Photonic integrated circuit (PIC) and silicon photonics transceiver validation at baud rates up to 120 GBaud+

Academic and Research Institutions

Research groups at IITs, NITs, DRDO, ISRO, C-DOT, and national photonics laboratories use the platform for frontier research into optical communication technologies that are years ahead of current commercial deployments:

• Advanced modulation format research — probabilistically shaped QAM, geometric constellation shaping, OFDM, and Nyquist-WDM spectral efficiency optimisation

• Multi-carrier transmission experiments — nonlinear fibre propagation, stimulated Raman scattering, cross-phase modulation, and four-wave mixing characterisation in fully loaded DWDM systems

• Space-division multiplexing (SDM) and few-mode fibre transmission experiments requiring multiple simultaneous coherent transmitter and receiver channels

• AI and machine learning-based optical performance monitoring algorithm development and validation using real multi-channel transmission data

Data Centre Interconnect (DCI)

Hyperscale data centre operators and DCI equipment vendors use the platform to validate the terabit-scale optical links that interconnect data centres across metropolitan and regional distances:

• 400G ZR and 400G ZR+ pluggable coherent transceiver testing to OIF standards

• 800G and 1.6T intra-data-centre and inter-data-centre optical link characterisation

• Amplified and unamplified DCI link performance benchmarking across distance, span loss, and channel count

• Multi-vendor interoperability validation for open line system (OLS) deployments

High-Performance Computing (HPC)

National supercomputing centres, HPC facility operators, and scientific computing organisations use the platform to validate the ultra-low-latency, high-bandwidth optical interconnects that connect compute nodes, storage arrays, and accelerator clusters in next-generation HPC and AI training infrastructure:

• InfiniBand and Ethernet over optical fibre interconnect performance validation at terabit aggregate capacities

• Low-latency coherent optical link characterisation for latency-sensitive distributed computing applications

• Optical switching and routing validation for software-defined HPC network architectures

Defence and Secure Communications

Defence organisations and secure communications programme offices use the platform to evaluate high-capacity, resilient optical links for mission-critical applications including:

• Secure tactical fibre network validation at terabit aggregate capacities

• Satellite ground station and long-haul defence fibre link characterisation

• Quantum key distribution (QKD) co-existence testing on multi-channel DWDM infrastructure

• Optical communication system qualification for naval, airborne, and ground-based platforms under environmental stress conditions

United Spectrum Instruments delivers the Multi-Terabit Optical Test Solution in India backed by deep expertise in photonics, coherent optical communications, and high-speed optical transmission test and measurement. As the official authorised distributor of ID Photonics GmbH in India, we provide comprehensive end-to-end support that ensures every customer achieves successful deployment and optimal performance from their investment.

What you receive when you partner with United Spectrum:

• System configuration consultation — our engineers work with your team to define the right starting configuration (channel count, baud rate, modulation format, receiver bandwidth) and expansion roadmap for your specific application

• Application consultation and pre-delivery validation — the complete system is validated for your specific test scenarios before shipment, ensuring it produces correct results from the first measurement

• Installation and commissioning support — on-site or remote installation support to bring the full system online in your lab or production environment

• Training — hands-on training for your technical team covering instrument operation, automation interfaces, measurement best practices, and data interpretation

• Long-term service and technical support — ongoing support for system upgrades, additional building block integration, automation development, and performance troubleshooting throughout the system’s operational lifetime

• GST-compliant, MSME-registered procurement — complete institutional and government procurement documentation including GST invoicing, IEC compliance, and MSME certification