Super Low EVM for NTN/D2D Satellite Feeder Line Fiber Transport

Executive Summary:

A U.S.-based NTN/direct-to-device satellite provider evaluated Optical Zonu RF over Fiber transport links for a satellite feeder-line ground station application reporting exceptional signal integrity across a demanding multi-channel environment.

The customer needed a transport architecture that could contribute very little error vector magnitude (EVM) to the overall system, helping preserve margin for other electronic components in the end-to-end signal chain.

Optical Zonu’s eFiberSat RFoF architecture demonstrated ultra-low EVM performance, achieving a reported 0.28% minimum EVM and maintaining less than 1.0% EVM across a 35 dB optical dynamic range, compared with a typical 3.0% MNO benchmark.

The result was a broadband, sub-6 GHz RFoF transport solution that significantly reduced EVM burden, supported high instantaneous modulation bandwidth, and improved integration flexibility for the larger satellite ground station system.

Challenges:

- Support NTN/direct-to-device satellite feeder-line transport with very low system-level EVM contribution.
- Maintain strong EVM performance across a wide 35 dB optical dynamic range.
- Support high instantaneous modulation bandwidth across sub-6 GHz operating frequencies.
- Reduce integration pressure on downstream and upstream electronics by preserving EVM margin for the rest of the system.
- Provide a flexible RFoF alternative to bandwidth-constrained digital or packetized IF transport approaches.

OZC Solution:

Optical Zonu provided an eFiberSat RF over Fiber transport architecture designed for high-performance satellite feeder-line signal transport. The system used a dual-polarization, redundant fiber architecture to support end-to-end multi-channel transport for the customer’s ground station environment.

Unlike bandwidth-constrained digital or packetized IF approaches, the Optical Zonu RFoF architecture provides broadband analog RF transport across sub-6 GHz operating frequencies. This allows complex wideband and multi-carrier signals to be transported without requiring narrow frequency-specific hardware changes or restrictive filtering for each operating band.

The solution delivered extremely low EVM contribution and high ACLR to the overall system, allowing the customer to preserve margin for other components in the signal chain. By contributing less than 1.0% EVM across a 35 dB optical dynamic range, the Optical Zonu transport system helped improve overall signal quality and reduce integration constraints in the larger NTN/D2D satellite ground station system.

Optical Zonu Products Used:

Optical Zonu eFiberSat RF over Fiber transport system
Dual-polarization redundant fiber transport architecture
Sub-6 GHz broadband RFoF feeder-line transport links
Custom system-level RFoF engineering support for satellite ground station integration
Managed RFoF is a suite of tools and applications used to monitor/control local and geographically dispersed signal transport systems. Only a standard web browser is required to connect to an embedded Managed RFoF agent. SNMP v2/v3 enables all user interfaces. A System level remote monitoring and management system SNMP

Results / Outcomes

Reported minimum EVM of 0.28%, significantly below the typical 3.0% MNO requirement.
Maintained less than 1.0% EVM across a 35 dB optical dynamic range.
Delivered approximately 2.0% or more EVM margin across the tested dynamic range, helping preserve system-level performance margin.
Achieved greater than 40 dBc ACLR, supporting spectral purity and reducing adjacent-channel interference risk.
Supported high instantaneous modulation bandwidth across sub-6 GHz operating frequencies.
Improved integration flexibility for multi-channel feeder-line transport in a satellite ground station environment.
Helped ease downstream deployment constraints by reducing the RFoF transport system’s contribution to the total allowed EVM budget.

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