GRACYFIBER's Ultra-Miniature Wavelength Division Multiplexer (UCWDM) is a revolutionary high-density optical engine designed to break down the physical space barriers within 5G fronthaul and high-speed optical modules (100G~800G). Abandoning the bulky cascaded structure of traditional wavelength division multiplexers, our UCWDM employs a cutting-edge free-space optics architecture, cleverly combining a mini collimator and a reflecting mirror to achieve extreme miniaturization. The product not only fully covers CWDM, LWDM, and DWDM (ITU Grid C21~C60) wavelength standards, but also delivers extremely low insertion loss and industrial-grade wide-temperature reliability while shrinking to an astonishing 20 × 8 × 6.5 mm (4CH module). It is a core enabler for future-oriented miniaturized optoelectronic integrated systems.

(Specifically developed to solve your pain points of extreme space constraints and high-speed signal crosstalk)

Pain Points Solved/Value Boost: The 4-channel CWDM/LWDM/DWDM module measures only 20 × 8 × 6.5 mm to 20 × 12 × 6.5 mm. Even the fully loaded 18-channel CWDM module is tightly controlled to 25 × 22.8 × 6.5 mm. This revolutionary small size allows it to be directly embedded into compact QSFP-DD/OSFP high-speed optical module housings, or perfectly integrated into the constrained housings of 5G millimeter-wave micro base stations.

Pain points addressed/value: The innovative Z-block architecture provides this device with exceptional wavelength scalability. Whether it's 20nm CWDM, 4.5nm LWDM, or high-density 0.8nm DWDM signals, a single underlying architecture can meet the development needs of your entire product line, significantly reducing R&D prototyping and inventory management costs.

The maximum insertion loss of the 4CH module is only 1.2 dB (CWDM/LWDM) and 1.5 dB (DWDM). Combined with high isolation of ≥30 dB for adjacent channels and ≥40 dB for non-adjacent channels, it perfectly guarantees the optical signal-to-noise ratio (OSNR) of high-order modulation signals (such as PAM4) and completely eliminates bit errors caused by crosstalk between dense channels.

Standard operating temperature is -5°C to 65°C, with the ability to quickly customize industrial-grade wide-temperature range ($-40°C to +85°C). This ensures that the device maintains zero wavelength drift and absolute optical stability even in outdoor 5G RRU tower environments or specialized military applications where temperature control is unavailable.

All DWDM and CWDM channels feature ultra-low in-band ripple of up to 0.5 dB. This significantly enhances the system's tolerance to wavelength drift caused by long-term aging of passive lasers, increasing the overall network lifespan and maintenance-free period.

Our UCWDM is the ultimate solution for achieving massive bandwidth multiplexing within a compact space:

• High-speed optical module internal integration: Core multiplexing/demultiplexing components for 100G, 200G, 400G, and even 800G optical transceivers.
• 5G Fronthaul Network: Tailor-made for outdoor micro base stations and RRUs with size and weight constraints.
• Hybrid WDM/DWDM Network: Achieves high-density wavelength overlay at aggregation nodes in metropolitan area networks and access networks.
• Military & Specialized Communications: Meets the extreme lightweight (SWaP) requirements of aerospace and defense applications.
• CATV and Broadcast Networks: Compact outdoor optical node video signal fusion.