Fused fiber couplers remain the workhorse of optical signal splitting, combining, and monitoring - critical functions across telecommunications, industrial, medical, and defense applications. At G&H, we’ve refined this technology for decades, achieving low loss, high power handling, and wavelength flexibility. But the real story lies in how fused couplers provide the building blocks for today’s complex fiber optic modules. By leveraging our vertical integration - from specialty fiber and precision couplers through to amplifier modules and laser subsystems - we enable compact, rugged solutions tailored to customer requirements. This talk will explore the performance characteristics of advanced fused couplers, show how they transition into modular architectures, and share case studies where integration has reduced footprint, improved reliability, and accelerated time-to-market for OEMs.