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Article Overview

High-performance low-loss optical routers are available commercially from POLATIS and Cisco, and advanced research prototypes achieve sub-2% insertion loss for quantum and telecom applications.

Commercial Optical Routers

POLATIS Series 6000 The POLATIS Series 6000 is a fully non-blocking all-optical matrix switch available in sizes from 8x8 up to 192x192 ports. It features exceptionally low optical loss, fast switching speeds, compact size, and low power requirements. The switch supports Software-Defined Networks (SDNs) via OpenFlow and NETCONF interfaces, enabling low-latency routing for time-critical traffic in data centers and telecom networks. Its patented DirectLight™ optical switching technology is widely used in high-performance and defense applications, making it suitable for large-scale optical networks . Cisco Routed Optical Networking Cisco offers routed optical networking solutions that integrate coherent pluggable optics directly from router ports, supporting DWDM functionality. These routers can transmit 400G wavelengths up to 120 km unamplified and extend long-haul transmission with OpenZR+ optics. They reduce network CapEx and OpEx by minimizing the need for transponders and optical transport equipment while maintaining low insertion loss and high bandwidth efficiency. Cisco's solutions are optimized for metro, DCI, and long-haul networks, supporting 100G/400G/800G switching performance .

Research-Grade Low-Loss Routers

Telecom L-Band Polarization-Maintaining Router Recent research demonstrates a low-loss, polarization-maintaining router for single and entangled photons at the telecom L-band. This interferometer-based router achieves 1.3% transmission loss, a switching extinction ratio above 22 dB, and over 99% polarization process fidelity. It is designed for quantum photonic networks and multi-photon entanglement synthesis, offering sub-3 ns switching times . Arrayed Waveguide Grating Router (AWGR) A silicon-on-insulator 4×4 cyclic AWGR has been fabricated with low insertion loss, achieving a minimum loss of 1.1 dB and crosstalk below −22.7 dB. The design improves coupling efficiency and uniformity across all input-output ports, and it can be scaled to larger arrays for high-performance optical routing in telecom and data center applications .

Summary

For commercial deployment, POLATIS and Cisco provide robust low-loss optical routers suitable for high-speed, large-scale networks. For quantum or experimental applications, research-grade routers such as polarization-maintaining L-band routers and AWGRs offer extremely low insertion loss and high fidelity. When selecting a router, consider port count, insertion loss, switching speed, and compatibility with your network wavelength to ensure optimal performance.

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{abstract*} In photonic quantum applications, optical routers are required to handle single photons with low loss, high

Low-loss optical routers available now
Low-loss optical routers available now [PDF]

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