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Copper or Fiber Optics? Navigating the Interconnect Dilemma in Harsh Environments
Nicomatic
The data deluge and the SWaP challenge Modern defense and aerospace operations rely on a critical resource: data. From AESA radars requiring massive signal processing to real- time 4K video streams from drones, bandwidth demands have exploded. Engineers now face a paradox. They must transmit terabits of data at unprecedented speeds, while the physical envelope of electron- ics, SWaP (size, weight, and power), continues to shrink. On top of that, these systems must survive the harshest environments: intense launch vibrations, thermal cycling in low-Earth orbit, or the shocks of a hard landing. This creates a design dilemma: should one stick with the proven reliability of copper or move toward the high-throughput potential of fiber optics? The answer isn’t binary; it depends on a careful analysis of mission constraints. To make an informed choice, it’s essential to go beyond common assumptions and examine the physical properties of each option. Fiber optics: speed, stealth, and weight savings Adopting fiber is not a trend, it’s a physics-driven response to bandwidth limitations. • Bandwidth & distance . Copper suffers from significant attenuation (signal loss) at high frequencies. Fiber supports data rates of 10 to 25 Gb/s and beyond over long distances without repeaters.
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EMI immunity. In electronically contested environments, fiber is inherently immune to electromagnetic (EMI) and radio-frequency interference (RFI). It also provides physical security: the signal does not radiate, making remote interception impossible. Mass reduction. Replacing shielded copper harnesses with optical fiber can drastically reduce cabling weight, an essential advantage for aircraft and satellites.
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Copper: Power, legacy, and modularity Despite the rise of optics, copper remains ubiquitous for three key physical and oper - ational reasons. • Power distribution & mixed signals. This is fiber’s hard limit; it cannot carry electrical power. Copper enables not only power delivery but also modularity. Proven architectures based on 2 mm- pitch standards (such as the CMM range) allow engineers to combine low- frequency signal contacts, high-current power, and coaxial lines within the same connector. This functional density is a major asset on crowded PCBs.
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