Hirundo CDWDM: Compact Low-Loss Coarse WDM for Metro and Access Networks

Metro aggregation and access-layer networks are under constant pressure to carry more services, reach more sites and support 10Gbps enterprise upgrades without expanding fiber routes. Hirundo CDWDM, a compact coarse wavelength division multiplexing platform also known as CCWDM, is designed for exactly this environment. It combines a small package, low insertion loss and low power consumption with the practical channel plans and wavelength coverage needed for metro aggregation, access-layer fiber links, campus networks, hospital campuses, industrial parks and commercial buildings.

Why Compact Coarse WDM Matters

Coarse WDM has long been used to multiply fiber capacity with 20 nm channel spacing and uncooled optics. In metro and access networks, however, space is often limited at street cabinets, remote sites, floor distribution boxes and building equipment rooms. Conventional CWDM modules can be too bulky, and every extra insertion loss point reduces link budget. Compact coarse WDM solves these constraints by integrating WDM multiplexer and demultiplexer functions into a miniature package while keeping the optical path simple and passive.

For network builders, the benefits are practical. A compact CCWDM helps solve fiber shortage, supports multi-service transparent transmission and allows links to be built and operated in a short time. Because the module is passive, it introduces no active equipment failure or power-cut risk. This is important in hospital medical image transmission, campus multimedia teaching and industrial real-time data collection, where stable operation and low maintenance matter as much as bandwidth.

What the Hirundo CDWDM Platform Delivers

Hirundo CDWDM is a compact coarse WDM family for metro transmission and access-layer aggregation. The platform supports 4, 8, 16 and 18-channel configurations plus special options, and it is available as a MUX, DEMUX or MUX+DEMUX module. For networks that must overlay a legacy service or an upgrade path, the 8+E1CH and 8+E2CH versions add an upgrade port. The 8+E1CH version provides a 1310±50 nm upgrade window, while the 8+E2CH version covers a 1260-1458 nm upgrade range, giving designers flexibility when mixing new coarse WDM channels with existing traffic.

Channel wavelengths cover 1270-1610 nm and 1271-1611 nm with 20 nm channel spacing. The channel passband is ≥13 nm at -0.5 dB, which supports practical laser tolerance and simplifies field deployment. Hirundo also offers multiple package styles, including compact 44×25×6 mm and 50×50×6 mm modules, insert box formats and rackmount versions. This range allows the same CDWDM design to be used in small access nodes, outdoor enclosures and larger central office racks.

Key Specifications for Design Confidence

• Channel options: 4CH, 8CH, 16CH, 18CH and special configurations; 8+E1CH and 8+E2CH upgrade versions.
• Wavelength range: 1270-1610 nm and 1271-1611 nm, with 20 nm channel spacing.
• Insertion loss: ≤1.0 dB for 4CH, ≤1.5 dB for 8CH and ≤3.0 dB for 18CH modules.
• Isolation: adjacent channel ≥30 dB, non-adjacent channel ≥40 dB and UPG ≥15 dB.
• Stability: insertion loss temperature sensitivity ≤0.5 dB, wavelength temperature shift ≤0.002 nm/°C, PDL ≤0.2 dB and PMD ≤0.1 ps.
• Optical return loss ≥45 dB and directivity ≥50 dB for reliable bidirectional links.
• Maximum power handling of 300 mW and operating temperature from -40°C to +85°C.

These parameters make Hirundo CDWDM suitable for low-cost, high-performance transmission in metro networks. Low insertion loss preserves optical margins, high isolation reduces channel crosstalk and the wide temperature range supports deployment in less-controlled enclosure environments.

Applications in Metro, Access and 10G Passive Fiber Networks

In metro aggregation and access layers, Hirundo CDWDM can be used to combine and separate coarse WDM channels at distribution nodes, business buildings and residential access points. Its compact size is valuable where rack space is scarce, and its passive transparency supports Ethernet, storage, video and other service types over the same fiber infrastructure. The module is also a natural fit for the color light Ethernet and all-optical Ethernet 3.X passive WDM networking model used in parks, campuses and hospitals.

For education networks, CDWDM can support unified fiber links for multimedia teaching, dormitory broadband and security monitoring. For hospitals, it supports internal networks for radiological image transmission, outpatient offices and ward monitoring. In industrial parks, it can serve high-definition monitoring, factory offices and warehouse connectivity. In commercial buildings and hotels, it provides a practical path for 10Gbps broadband reconstruction. Compared with traditional PON and active switch networking, passive WDM color light solutions offer exclusive bandwidth, low maintenance and predictable lifecycle costs, especially when many low-density sites must be connected quickly.

A Practical Choice for Cost-Sensitive Fiber Builds

Hirundo positions CDWDM as more than a standalone component. The company supports application review, customized channel and wavelength configurations, and deployment planning for system integrators, weak current engineering contractors and park construction units. By combining compact coarse WDM hardware with passive network design, Hirundo helps builders reduce fiber consumption, simplify maintenance and accelerate 10Gbps internal fiber network delivery.

For metro and access networks that need a small, low-loss and cost-effective coarse WDM multiplexer or demultiplexer, Hirundo CDWDM provides a focused solution. Its 4/8/16/18-channel options, 1270-1610 nm coverage, 20 nm spacing, low power consumption and robust environmental specifications make it a strong building block for the next phase of passive optical networking.