Applications and Solutions:

Designing an optical network can be a daunting task. A complex matrix of constraints and considerations is often in play, requiring expertise and extensive knowledge to design a network and arrive at a practical solution. It’s not just what a given network element does that matters, but also how network elements are chosen and connected and used together to achieve a total network solution with the functionality, capabilities and resiliency desired. Optelian’s specialty is designing complete optical networking solutions, from simple point-to-point DWDM networks to full mesh networks with multi-layer networking capabilities. Whether it is an entirely new network, where even the type of fiber is yet to be selected and deployed, or an existing network with much legacy equipment that needs to be modified to provide new services and higher bandwidth, Optelian can architect a cost-optimized solution that meets the design constraints and desired networking capabilities. Following are some of the more common applications for an Optelian optical networking solution.

Router and Switch Interconnect

server, network concept

Routers and switches often need to be connected over long distances to provide a switched Layer2+ network over a broad geographical footprint. The footprint can range from an enterprise campus, to a city, all the way up to a trans-national network, or even a network with a global reach. The bandwidth required for these connections can be enormous, especially when inter-connecting data centers. Optelian provides optical networking solutions for such applications. These solutions are completely transparent to routers and switches, allowing them to interoperate with each other as though they were directly connected with no underlying transport network. This is achieved using a combination of network elements such as transponders, muxponders, optical amplifiers and OADMs and/or ROADMs, depending on the needs of the network. In some cases the router or switch may have the capability to transmit a DWDM wavelength directly, called a “colored” transmitter, in which case a transponder is not required, and Optelian solutions are able to work seamlessly with such “alien” wavelengths.

Private Line Wavelength Services


Private line wavelength services provide a true “wired” connection that is independent of the protocol being transmitted. A true private line provides dedicated and completely deterministic bandwidth for the connection, with a fixed and extremely low latency and complete transparency to the bit pattern being transmitted. Such services are not subject to oversubscription, which is common with packet optical networking or any other Layer2+ transport networking approach, such as MPLS or PBB-TE. With the use of OTN wrapping, comprehensive service demarcation and performance monitoring is provided, with completely error-free transmission.The network can also be designed to provide protection for services in the case of a fiber cut or a node failure. With the combined use of muxponding, add-drop multiplexing and coherent transmission, extraordinary efficiencies and high transmission capacity can be achieved over a single transmission fiber.

Fiber Relief and Network Overlays


Many networks have been initially deployed using 1310 nm wavelengths only. As new networking equipment is added, such as routers and switches for Ethernet WANs, there is often a need to provide more capacity over the same physical fiber, without upsetting existing services and equipment. A common solution for this is to add new wavelengths with optical multiplexing filters. For example, 8 CWDM wavelengths can be added to an existing 1310 nm wavelength, allowing the capacity of a fiber to be increased by 800%. For even higher capacity, the 1310 nm wavelength can be transponded to a DWDM wavelength, and optical multiplexing filters can then be used to increase the capacity by a factor of 40 or more. In fact, the combination of muxponding and optical filtering can increase the capacity of an existing physical fiber by a factor of 1000 or more! Each new circuit or wavelength can provide connectivity for an entirely new overlay network, allowing new networking technologies to be overlaid on the same physical fiber and transport infrastructure with effectively unlimited capacity growth.

Enterprise Private Optical Networks

business hand pushing security button with global networking concept

Enterprise networks are often interconnected over leased lines from one or more service providers. However, the availability of dark fiber is becoming more prevalent, and the cost and simplicity of optical networking equipment has improved significantly, allowing enterprises to now build and operate their own private optical networks. Manageability of a private optical network is much simpler these days, too, due to improvements in network management tools and network automation. Moreover, the bandwidth requirements for enterprise networks is increasing exponentially, and there are also security concerns that can drive the need for a true private network, not just “private network-as-a-service”. For example, Utility companies in particular often require highly secure connectivity for internal data communications and process control telemetry, with bandwidth and latency requirements that are rigid and which cannot be compromised. A private optical network can be implemented partially or completely for an enterprise, and can have enormous savings implications and a positive impact to the operations and bottom line of a business. Properly designing the private optical network is, however, key, and Optelian provides all the tools necessary, from equipment to network design services, to realize a state-of-the-art private optical network.

Access and Aggregation Networks

Policy decisions

Optical fiber plays a key and critical role in access and aggregation networks. Although twisted pair copper and coaxial cable continue to feed many residential and even business locations, these increasingly terminate on equipment placed very close to the home or business, while new homes and buildings increasingly have direct fiber connectivity. Similarly, back-haul of mobile data is provided over fiber wherever possible, and even front-haul of CPRI data links that directly feed remote radio heads is now carried over optical fiber. Moreover, the fiber distribution network is increasingly shared among users and services, such as with PON architectures, or with wavelength multiplexed aggregation networks. Optelian’s passive optical filter portfolio provides a comprehensive tool set for getting the most out of an optical access and aggregation network. For example, Optelian filter solutions allow 1310 nm or 1310/1490/1550 PON wavelengths to be multiplexed with other CWDM wavelengths, allowing point-to-point dedicated wavelength services to co-exist with these more common access wavelengths. For even higher capacity, Optelian provides co-existence filters for NG-PON2 applications, allowing DWDM and standard PON wavelengths to co-exist on the same fiber distribution network. In conjunction with multi-protocol muxponders, ADMs and coherent transceiver technology, the capacity gains possible in access and aggregation networks is astounding.

Extended Temperature Range Applications

Thermometer Fahrenheit Celsius Heat Illustration Concept of climate change, global warming, summer heat.

It is very common for networking equipment to require an environmentally controlled location for proper and reliable operation. In some cases the ambient temperature must be maintained below 35C and above 0C for certain equipment to operate, mandating the need for reliable HVAC systems. However, there is often a need for equipment to continue to operate properly during an HVAC failure, or to place networking equipment in a completely uncontrolled environment, such as in outdoor cabinets or huts. In this case the equipment must operate reliably over a much wider temperature range, usually from -40C to +65C ambient. All Optelian passive optical filter products are designed and rated for extended temperature range operation. Moreover, the OMS-2190 active platform is designed and certified for operation over an extended temperature range, in accordance with GR-3108 Class 2 requirements, allowing for high-capacity networking capabilities in such environments. Networking cards such as the RGN-8010, RGN-8040, RGN-10GXF, FLX-1610 and OFA series optical amplifiers are all designed and rated for ETR operation when used in the OMS-2190 shelf. Hence, Optelian provides a complete ETR solution for all types of networking equipment, providing much more flexibility on how and where equipment is deployed, without mandating the need for expensive HVAC systems.