What Is Dark Fiber? Definition, How It Works, and Benefits for Businesses

As businesses become increasingly dependent on digital connectivity, network infrastructure has become a critical foundation for supporting day-to-day operations. The growing volume of data traffic, increasing use of cloud services, the need for inter-site connectivity, and connectivity requirements for data centers have created a demand for networks that are not only reliable, but also flexible and capable of supporting future business growth.

One solution that can be considered for these requirements is dark fiber. Unlike internet services that generally provide connectivity with a predefined bandwidth capacity, dark fiber provides access to passive fiber-optic infrastructure that can be operated using active equipment based on the customer's requirements. BAKTI Komdigi, for example, provides dark fiber leasing services through passive fiber-optic networks.

So, what is dark fiber, how does it work, and what are the benefits of dark fiber for businesses? Let us explore the complete explanation below.

What Is Dark Fiber?

Dark fiber refers to fiber-optic infrastructure that has been physically deployed but is not currently being used to transmit data or has not yet been “lit.” The term dark refers to the condition of the fiber, which is not carrying optical signals.

Simply put, if a fiber-optic network is compared to a road used to transport data, dark fiber can be considered a road that has already been built, while the user determines the vehicles and transportation system to be used.

With a dark fiber service, the provider supplies the fiber-optic infrastructure, while the customer can deploy their own active equipment to determine the transmission technology and network capacity according to their requirements. A similar concept is also applied to the dark fiber infrastructure of the Palapa Ring.

For this reason, dark fiber is commonly used for applications that require high capacity, flexibility, network control, and scalability, including by enterprises, Internet Service Providers (ISPs), telecommunications operators, and data center facilities.

How Does Dark Fiber Work?

To understand how dark fiber works, it is important to first distinguish between passive fiber-optic infrastructure and active network equipment.

In a dark fiber service, the fiber cable or fiber core is part of the passive infrastructure. The fiber does not carry data traffic until it is connected to appropriate active equipment. In simple terms, the process can be illustrated as follows:

Dark Fiber Operation Flow

The active equipment then converts data into optical signals, which are transmitted through the fiber-optic cable.

One of the key characteristics of dark fiber is that customers have greater flexibility in selecting the transmission technology and network capacity based on their infrastructure requirements.

In other words, dark fiber is not simply a “high-speed internet” service. Rather, it is connectivity infrastructure that provides customers with greater flexibility in designing and managing their networks.

What Are the Benefits of Dark Fiber for Businesses?

For companies with complex networking requirements, dark fiber can provide several benefits.

• Supporting High-Capacity Network Requirements

The growth of digital applications, cloud computing, data transfers, video, AI, and other data-intensive services can significantly increase network capacity requirements.

Dark fiber allows companies to use equipment and transmission technologies that can be tailored to their capacity requirements. As a result, dark fiber is commonly associated with high-capacity connectivity requirements, particularly for large enterprises and data centers.

• Flexibility in Determining Network Capacity

One of the key characteristics of dark fiber is that customers can determine the transmission technology and capacity based on their network requirements. This is particularly important for businesses whose bandwidth requirements continue to grow. For example, companies can design network capacity based on:

• Data traffic volume
• Interconnection requirements
• Applications being used
• Number of locations
• Data center requirements
• Future network expansion plans

This allows businesses to build infrastructure that is better aligned with their specific requirements compared with solutions that are entirely fixed.

• Greater Control Over Network Infrastructure

Dark fiber enables customers to operate their own active equipment and select network technologies according to their network design. This level of control can be particularly important for companies with internal IT or network engineering teams that require more specific network configurations.

In other words, businesses are not simply purchasing connectivity access. They have greater flexibility in determining how the network is designed, operated, and utilized.

• Supporting Network Scalability

Business network requirements can change as the company grows. A company may require a certain level of capacity today, but as the number of users, branches, applications, servers, and data traffic increases, its network requirements may also evolve.

Dark fiber can support a network scalability strategy because capacity and transmission technologies can be developed based on the capabilities of the infrastructure and active equipment being used.

Flexibility and scalability are among the key benefits commonly associated with dark fiber for business networking requirements.

• Supporting Inter-Site Connectivity

Companies with multiple offices, branches, operational facilities, or data centers require reliable connectivity to connect these locations.

Dark fiber can be used as part of a point-to-point connectivity infrastructure or for inter-site connectivity, depending on the network design and services available. For example:

Point-to-Point Interconnection

A dark fiber service can be provided as point-to-point connectivity between specific locations.

Who Needs Dark Fiber?

Dark fiber is not necessarily a solution for every company. It is more relevant to organizations with specific connectivity and network infrastructure requirements. Some of the organizations that may benefit from dark fiber include:

Enterprise Companies

Companies with multiple branches or high-volume data transfer requirements can use dark fiber to establish connectivity between locations.

Internet Service Providers (ISPs)

ISPs require network infrastructure to support their backbone, traffic distribution, and network expansion.

Data Centers

Data centers require high-capacity connectivity to connect facilities, networks, and digital ecosystems. High-capacity connectivity requirements within data center environments are also one of the common use cases for dark fiber.

Telecommunications Companies

Telecommunications operators can use dark fiber as part of their network infrastructure development and expansion.

Organizations with Complex Digital Infrastructure

Organizations managing multiple locations, applications, servers, internal systems, and large volumes of data traffic can also consider dark fiber as part of their network infrastructure strategy.

When Should a Business Consider Dark Fiber?

Not every company requires dark fiber. However, this solution may be worth considering if a business experiences several of the following conditions:

• Increasing bandwidth requirements
• Multiple offices or operational locations
• A need for data center interconnection
• A need for point-to-point connectivity
• A requirement for greater network control
• A need for flexibility in determining network capacity
• An IT/network team capable of managing active network equipment
• Long-term network expansion plans
• Large and continuously growing data traffic

Therefore, the more relevant question is not simply, “Is dark fiber faster?” but rather: “Does the company need fiber infrastructure that provides greater flexibility and control over its network?” If the answer is yes, dark fiber may be one of the connectivity options worth considering.

What Should You Consider Before Choosing a Dark Fiber Service?

Before using a dark fiber service, businesses should look beyond pricing or the number of fiber cores. Several other factors should also be considered, including:

• Network Coverage and Routes

Make sure the dark fiber route is available between the required locations.

• Number of Cores

The number of fiber cores should be aligned with the network design and business requirements.

• Capacity and Technology

Consider the transmission technology and active equipment required to operate the network.

• Redundancy

For mission-critical business requirements, consider network designs with redundant routes to minimize dependency on a single path.

• SLA and Operational Support

Review the Service Level Agreement (SLA), monitoring, maintenance, and technical support provided by the service provider.

• Scalability

Consider whether the infrastructure can support the company's future requirements as capacity and the number of locations increase.

• Total Cost of Ownership

Do not calculate only the fiber leasing cost. Also consider active equipment, installation, maintenance, monitoring, and other network operational expenses.

Get to Know Zetta-Core, SDI's Dark Fiber Solution

If your business requires fiber-optic infrastructure to support high-capacity connectivity, inter-site connectivity, or more flexible networking requirements, Zetta-Core can be considered as one of the available solutions. Zetta-Core is a dark fiber service designed to support B2B connectivity and network infrastructure requirements.

Through its dark fiber approach, businesses can utilize fiber-optic infrastructure to build connectivity based on their network requirements and the active equipment they use. Zetta-Core can be a suitable option for businesses that require:

• Fiber-optic connectivity
• Inter-site connectivity
• High network capacity
• Enterprise connectivity
• Data center connectivity
• ISP network infrastructure
• Network development and expansion
• Greater flexibility in network management

Rather than focusing solely on “fast internet,” the dark fiber approach allows businesses to view connectivity as part of their long-term network infrastructure strategy.

Build a Future-Ready Network Infrastructure with Zetta-Core

Every business has different network requirements. Therefore, connectivity solutions should be aligned with the required capacity, locations, network architecture, and long-term business development plans.

If your company is looking for a dark fiber service for business, requires inter-site connectivity, or would like to determine whether Zetta-Core is suitable for your network infrastructure requirements, the Zetta team is ready to provide further information and connectivity solutions tailored to your business needs.

FAQ

• What is dark fiber and how does it work?

Dark fiber is fiber-optic infrastructure that has already been physically deployed but is not currently being used to transmit data. Users can connect dark fiber to active network equipment to transmit data according to their required network capacity and transmission technology.

• What are the benefits of dark fiber for businesses?

Dark fiber can provide greater flexibility and control over network infrastructure. It can support high-capacity connectivity, inter-site connectivity, data center interconnection, and network expansion that requires scalability.

• What is the difference between dark fiber and dedicated internet?

Dedicated internet is an internet connectivity service with a specified bandwidth capacity that is generally managed by the service provider. In contrast, dark fiber is passive fiber-optic infrastructure that customers can operate using their own active equipment and transmission technology.

Therefore, dark fiber focuses more on flexibility and control over network infrastructure, while dedicated internet focuses on providing managed internet connectivity.

• Who needs a dark fiber service?

Dark fiber is generally relevant for enterprise companies, ISPs, telecommunications operators, data centers, and organizations with requirements for inter-site connectivity, high-volume data traffic, or network infrastructure that requires greater flexibility and scalability.

• What is Zetta-Core and what is it used for?

Zetta-Core is a dark fiber service provided by PT Sumber Data Indonesia for B2B connectivity and network infrastructure requirements. Zetta-Core can be used to support inter-site connectivity, high-capacity network requirements, data center interconnection, and network infrastructure development based on specific business requirements.