NIWC Pacific — Stratospheric Optical Link Demonstration (SOLD)¶
Last updated: Session 100, 2026-04-07 — No material change from Session 66. LaCE mission ended May 2025 as expected. CACI EST Phase 2 progressing. SDA Tranche 1 mesh network still ~3 months behind, launches targeting May/June 2026. CrossBeam remains operational on Blackjack 4+ years. SDA space-to-air optical comms RFI (Jan 2026) is new expansion vector but no contract awards yet. No new NIWC SOLD-related activity.
Summary¶
The Naval Information Warfare Center Pacific (NIWC Pacific) used FO to conduct a stratospheric test of the CACI Skylight laser communications terminal — a risk reduction campaign for the orbital Laser Crosslink Experiment (LaCE) mission. SOLD launched on a high-altitude balloon August 30, 2023, and demonstrated free-space optical communications between a stratospheric terminal and a ground station. LaCE subsequently flew as a 2-CubeSat LEO mission (March 2024–May 2025), achieving operational success on other payloads but encountering challenges with the Skylight terminal on orbit.
This is the only FO project where a DoD organization used FO explicitly as a risk-reduction precursor for an orbital military mission.
FO Project¶
| Field | Value |
|---|---|
| Project | 145002 |
| Title | Stratospheric Optical Link Demonstration (SOLD) |
| Lead Org | Naval Information Warfare Center Pacific |
| PI | Nathan S. Barnwell |
| Co-Is | Anh N. Nguyen (NASA), Jan Stupl (NASA Ames) |
| TRL | 5→6 |
| Period | 2022-08 to 2023-09 |
| TX | TX05.1: Optical Communications |
| Views | 2,626 |
| Status | Completed |
Technology¶
Problem: The DoD needs secure, high-bandwidth, jam-resistant communications for warfighters. Free-space optical (laser) communications offer advantages over RF: higher data rates, narrower beams (harder to intercept), and no spectrum licensing. But laser links through the atmosphere are degraded by turbulence, clouds, and pointing errors — challenges that intensify with distance and altitude.
SOLD approach: Fly the CACI Skylight laser terminal on a high-altitude balloon at stratospheric altitude and demonstrate a two-way free-space optical link to a mobile ground terminal. The stratospheric environment (thin atmosphere, reduced turbulence above ~20 km) approximates some aspects of the LEO-to-ground link, making it a cost-effective risk reduction step before orbital deployment.
FO's role: FO provided the balloon flight opportunity and integration support. The collaboration brought NASA's suborbital flight expertise (Jan Stupl at Ames co-investigator) together with Navy laser communications technology.
Downstream: Laser Crosslink Experiment (LaCE)¶
LaCE Mission (confirmed)¶
| Field | Value |
|---|---|
| Mission | Laser Crosslink Experiment (LaCE) |
| Operator | NIWC Pacific |
| Platform | 2× CubeSats (LaCE-1, LaCE-2) |
| Launch | March 4, 2024 |
| End | May 18, 2025 (~14 months) |
| Payloads | CACI Skylight laser terminal, ELROI optical beacon, Vulcan CSR payload radio, NIWC TT&C ground ops center |
Results¶
NIWC deemed LaCE an operational success overall. Key outcomes: - ELROI optical beacon: fully demonstrated - Vulcan CSR radio: fully demonstrated - Skylight laser terminal: experienced on-orbit challenges preventing full demonstration - NIWC developed "best practice" operational lessons including: - Value of stratospheric pre-launch test campaigns (validating SOLD's approach) - Value of satellite telecom radios as backup systems - Importance of precision PNT solutions for optical communications
Post-Mission¶
LaCE post-mission review presented at SmallSat Conference 2025 (USU DigitalCommons). NIWC explicitly validated the SOLD stratospheric test campaign as a useful risk reduction step — even though the Skylight terminal had challenges on orbit, the balloon-based testing provided data that informed the orbital mission design.
CACI's Full Lasercom Ecosystem (Session 47 deep dive)¶
CACI has three distinct lasercom terminal product lines, each at a different scale and maturity. Understanding the full ecosystem reveals that SOLD/LaCE was one thread in a much larger CACI DoD lasercom program:
1. Skylight® (CubeSat-scale, experimental)¶
- Ultra-low SWaP free-space optical terminal for CubeSats
- Tested on SOLD balloon (FO, Aug 2023) — stratospheric risk reduction
- Flew on LaCE 1/2 CubeSats (Mar 2024–May 2025) — on-orbit challenges with terminal
- Status: CubeSat-scale experimental; not the production terminal
2. CrossBeam® (Production-grade, operational)¶
- Fully integrated, compact FSO terminal designed for low-cost, high-volume manufacturing
- Deployed on DARPA Blackjack / SDA Mandrake 2 constellation — on-orbit since ~2021, still operational 3.5+ years later (as of Feb 2025)
- First SDA-compliant terminal to pass Optical Communication Terminal Interoperability Testing (OIT) for SDA Tranche 1 Transport Layer (Sep 2023)
- Part of Lockheed Martin team building 42 satellites for SDA T1TL (126-satellite mesh network)
- CACI has program wins in SDA Tranches 0, 1, AND 2 — the most comprehensive SDA lasercom footprint of any terminal vendor
3. Enterprise Space Terminal / EST (Next-gen, in development)¶
- CACI selected May 2025 as one of three companies (with General Atomics and Viasat; Blue Origin eliminated after Phase 1) for Phase 2 of the Space Force's ~$100M EST program
- EST goal: standardized enterprise waveform in a long-range space optical communications terminal (low SWaP-C) for DoD MILNET mesh network
- Awarded through Space Enterprise Consortium (SpEC) Other Transaction Authority (OTA)
- Selected based on cost, schedule, and performance after Phase 1 Preliminary Design Review
CACI's Other Optical Comms Work¶
- ILLUMA-T: Supported NASA's ISS-to-ground laser communications relay demonstration
- Psyche/DSOC: CACI technology powered the deep-space optical communications experiment that set the 307M-mile record — connecting NIWC SOLD to CDI's FO vibration isolation platform [91391], which stabilized the same DSOC payload
- Manufacturing: 36,000 sq ft Orlando facility (opened Jun 2022) + facilities in CA and NJ — dedicated to full-rate production of space flight hardware
Broader DoD Lasercom Landscape¶
SDA Tranche 1 status (updated Session 66, Apr 2026): 42 Transport Layer satellites on orbit (21 York Space Systems, 21 Lockheed Martin, launched Sep–Oct 2025). Optical intersatellite link (OISL) terminals from Mynaric, Tesat Spacecom US, and Skyloom. SDA Director Sandhoo: "We have not established the mesh network for Tranche 1 yet... We are about three months behind." Strategic pause in launches continues — follow-on launches targeted "May or June" 2026, with most Transport Layer launches within 6 months. Full constellation: 154 satellites (126 Transport + 28 Tracking), initial warfighting capability targeted early 2027. New: SDA issued RFI for space-to-air optical communication terminals (Feb 2026) — expanding lasercom beyond sat-to-sat/sat-to-ground to include direct aircraft links.
GAO assessment (Feb 2025, GAO-25-106838): DoD has not yet fully demonstrated space lasercom capabilities. Recommended further validation before large-scale investment. This validates the risk-reduction rationale behind SOLD — the DoD lasercom pipeline still needs flight-test maturation, exactly what SOLD provided.
Net Assessment (updated Session 47)¶
The SOLD→LaCE→EST arc is more significant than initially assessed. CACI's lasercom program spans three product generations, multiple DoD programs, and NASA deep-space missions:
| Thread | Scale | Status | Significance |
|---|---|---|---|
| Skylight → SOLD → LaCE | CubeSat | Experimental (on-orbit challenges) | FO-funded risk reduction validated approach |
| CrossBeam → Blackjack → SDA T0/T1/T2 | LEO constellation | Operational (3.5+ years on orbit) | Production terminal for DoD mesh network |
| EST Phase 2 | Next-gen standardized | In development (Phase 2 awarded May 2025) | ~$100M Space Force program |
| ILLUMA-T + Psyche/DSOC | ISS + deep space | Demonstrated | NASA laser relay + 307M-mile record |
The SOLD FO project is the earliest public test point in what has become one of the most comprehensive DoD lasercom programs. While Skylight had on-orbit issues, CACI's CrossBeam terminal has been the most successful SDA-compliant lasercom terminal by timeline and interoperability milestones. FO's stratospheric test (SOLD) validated the optical physics that CrossBeam also depends on — thin-atmosphere beam propagation and pointing/acquisition/tracking algorithms.
CDI connection: CACI provided laser modulation technology aboard Psyche for DSOC. Controlled Dynamics Inc. [91391] provided the vibration isolation platform for DSOC's optical bench. Two FO projects — CDI (stabilization) and NIWC/SOLD (terminal testing) — contributed to the same deep-space optical communications capability through completely different technology paths.
Dollar Tracking¶
| Source | Amount | Notes |
|---|---|---|
| NASA (FO) | — | FO provided flight opportunity; exact dollar amount not visible |
| DoD (NIWC) | Not tracked externally | Internal DoD funding for LaCE; no USASpending results for this specific project |
| CACI International | — | Skylight terminal is a CACI product; CACI has $7B+ in annual DoD revenue |
NIWC is a Navy-operated lab — their funding flows through DoD appropriations, not through USASpending-trackable contracts for this project.
Significance¶
New Archetype: FO as DoD Orbital Risk Reduction — SOLD represents a distinct pattern not previously seen in the FO portfolio: 1. DoD develops a laser comms system for military use 2. FO provides a stratospheric test opportunity as a cheaper, faster risk reduction step before orbital deployment 3. The stratospheric test validates (or reveals issues with) the system before the higher-cost orbital mission 4. DoD explicitly validates the FO/stratospheric test approach in post-mission lessons learned
Why the Skylight on-orbit challenges matter: The Skylight terminal had problems in orbit but worked in the stratosphere. This is actually a validation of SOLD's purpose — the stratospheric test proved the terminal could function optically, while the orbital mission revealed integration and pointing challenges specific to LEO. Without SOLD, NIWC would have had to diagnose whether failures were optical physics or spacecraft integration — SOLD narrowed the problem space.
Comparison to FIGARO-FT: Both SOLD and FIGARO-FT test communications technology at stratospheric altitude via FO balloon flights. SOLD is DoD laser comms; FIGARO is academic 5G for LunaNet. Same FO infrastructure, different customers and applications.
Surprise level: MEDIUM — Expected a DoD laser comms test. The specific finding that SOLD was a precursor to an orbital mission (LaCE), and that NIWC explicitly validated the stratospheric risk-reduction approach in their post-mission review, was a stronger connection than expected.
Verification¶
- Sample size: 1 FO project; 1 orbital follow-on mission; 3 CACI product lines traced
- Queries: techport_get_project [145002]; web search NIWC Pacific SOLD stratospheric optical; web search NIWC LaCE Laser Crosslink Experiment; web search CACI EST Phase 2; web search CACI CrossBeam SDA interoperability; web search SDA Tranche 1 lasercom status 2026
- Evidence: StratoCat.com launch record (Aug 30, 2023); NIWC press release on LaCE success (navy.mil); SmallSat Conference 2024/2025 papers (USU DigitalCommons); SSC press release (EST Phase 2, May 2025); SpaceNews (CACI SDA interop, Sep 2023); CACI investor relations (CrossBeam OIT completion, Sep 2023); CACI.com "Lighting the Future" article (CrossBeam on Blackjack 3.5+ years, SDA Tranches 0/1/2); Breaking Defense (SDA Tranche 1 delays, Mar 2026); GAO-25-106838 (Feb 2025)
- Counter-query: Was SOLD designed specifically for LaCE risk reduction, or was it an independent project that happened to use the same terminal? The SmallSat 2024 overview and NIWC post-mission review both describe SOLD as a "companion mission" and "alternate execution path" for the Skylight terminal, confirming the deliberate precursor relationship.
- Counter-query 2: Did SOLD data actually inform CrossBeam development? Not directly confirmed — Skylight and CrossBeam appear to be parallel product lines. However, CACI's optical physics and PAT algorithm knowledge is shared across products. The stratospheric propagation data from SOLD informs the atmospheric modeling that all CACI terminals use.
- Confidence: Confirmed for SOLD→LaCE connection; confirmed for CACI EST Phase 2 win; confirmed for CrossBeam SDA operational status; suggestive for SOLD→CrossBeam technical knowledge transfer
Cross-References¶
- SDSU FIGARO-FT — stratospheric comms testing via FO balloon; 5G vs laser
- topics/lunanet-cluster.md — SOLD is not LunaNet but demonstrates same FO-as-comms-testbed pattern
- Controlled Dynamics Inc. — Two FO projects → one mission: CDI [91391] stabilized Psyche/DSOC optical bench; CACI provided DSOC laser modulation technology. SOLD tested CACI's terminal technology on a balloon. Both FO projects contributed to deep-space optical comms.
- KSC AFTS — another FO project enabling infrastructure rather than developing a product
- topics/dod-lasercom-pipeline.md — full DoD lasercom investment pipeline tracing SDA, EST, and CACI's role