ISACSpine Optical ISAC Backhaul & High-Speed Backbone Networks

ISACSpine formalizes 400G/800G coherent optical fronthaul networks, analog radio-over-fiber microwave photonic distribution, and dual-use optical fiber vibration sensing.

ISACSpine Coherent Optical Fronthaul & Photonic Stack

ISAC Core: Spine Core — 800G Optical & Microwave Photonics

6G ISAC Nodes & Beamforming Subsystems

800G Coherent Optical Transceiver
Microwave Photonic Laser Mixer
Analog Radio-over-Fiber (A-RoF)
Distributed Acoustic Sensor (DAS)
Non-Blocking Clos Switch Fabric

Architectural Layers & Waveform Pipelines

Layer 1: Dual-Functional Waveform & Baseband (OTFS / OFDM-Radar / Fractional Fourier Transform / Ambiguity Function): Orthogonal Time Frequency Space (OTFS) modulation and fractional chirp synthesis achieving zero inter-carrier interference under severe Doppler spreads.
Layer 2: Massive MIMO & Beamforming Frontends (140 GHz D-Band / True-Time-Delay (TTD) / Hybrid Analog-Digital Beamforming): Sub-THz active phased array architectures with true-time-delay beam-squint mitigation, simultaneous communication data beams and pencil radar tracking lobes.
Layer 3: Radar Signal Processing & 4D Point Cloud (2D-FFT Range-Doppler / MUSIC AoA / CFAR Detection / Micro-Doppler Extraction): Sub-decimeter range and velocity resolution, constant false-alarm rate (CFAR) detection, and micro-Doppler biomechanical gait and drone propeller classification.
Layer 4: Network Sensing Orchestration & 3GPP Rel-19 (3GPP Rel-19 ISAC Core / Sensing Function (SF) / Reconfigurable Intelligent Surfaces (RIS)): Cell-free collaborative radar networks, dynamic time-frequency resource allocation balancing communication SLA against radar revisit time.

Sensing Telemetry & Benchmarks: <5 cm (Range Resolution) | 0.1 m/s (Velocity Precision) | <10 ms (Radar Frame Latency) | 3GPP Rel-19 (Global Standard)

Coherent Optics & Microwave Photonics in ISACSpine

Massive MIMO arrays operating in sub-THz spectrum generate terabits of raw radar and communication traffic that overwhelm legacy copper or microwave backhauls. ISACSpine defines the optical spine infrastructure connecting antenna radio heads to centralized baseband pools.

Core Engineering Areas

Coherent Optical Fronthaul Transport and 800G Transceivers — Dense Wavelength Division Multiplexing (DWDM) optical networks transporting digitized radio signals over single-mode fiber with zero latency jitter.
Analog Radio-Over-Fiber (A-RoF) and Microwave Photonics — Direct optical modulation of high-frequency microwave radar waveforms, centralizing RF generation and reducing remote radio head complexity.
Low-Latency Spine-Leaf Switching for Baseband Aggregation — Non-blocking spine-leaf Ethernet switching fabrics interconnecting hundreds of distributed cell sites with pooled GPU accelerators.