Fiber vs. Microwave: Key Differences in Backhaul Connectivity

The rise of mobile technologies and devices has led to a surge in data traffic worldwide. This increased demand for internet and voice services needs reliable backhaul connectivity for wireless and cellular networks like 2G, 3G, and 4G. Traditionally, copper lines, fiber optics, and microwave technologies have served this purpose.

Copper lines, while initially used, are becoming less common due to their higher cost and limited capacity. Optical fiber is increasingly replacing copper in wired connections. Microwave technology plays a significant role as well, accounting for approximately 50% of backhaul network deployments globally.

Optical Fiber: High-Capacity Wired Connectivity

Optical fiber is a popular choice for wired connections due to its relatively low material cost and high data-carrying capacity (bandwidth of around 11THz). A basic fiber communication system consists of a transmitter (LED or laser) and a receiver (photodiode).

Example of a fiber optic cable.

Examples of fiber-based systems include CWDM (Coarse Wavelength Division Multiplexing) and DWDM (Dense Wavelength Division Multiplexing).

Microwave: Wireless Point-to-Point Communication

Microwave technology provides wireless point-to-point communication. It involves transmitting electromagnetic waves between two locations that have a clear Line of Sight (LOS) with each other.

Example of a microwave tower.

Microwave point-to-point links used for backhaul connectivity operate across various frequency ranges, including 2 GHz, 6 GHz, 11 GHz, 18 GHz, 23 GHz, and 80 GHz.

Examples of microwave systems are PDH (T1, E1), SONET/SDH, and Ethernet microwave.

Fiber vs. Microwave: A Detailed Comparison

The following table highlights the key differences between optical fiber and microwave technologies:

Specifications	Optical Fiber Line	Microwave
Capacity	Unlimited in Gb/sec	Limited compared to Fiber, but sufficient for many backhaul applications.
Cost	Costs per foot or meter; incremental based on distance	Cost per link; independent of small distance variations.
Deployment Time	Increases with distance and varies linearly	Fast deployment.
Terrain	More costly in difficult terrain regions	Suitable for any terrain region, but requires Line of Sight (LOS) between the transmitter and receiver.
Re-use	Difficult to relocate once deployed	Equipment can be removed and relocated if needed.
Climate Effect	Normally not influenced, except in flood conditions	Influenced by climate; Adaptive Modulation and Coding (AMC) is used as a solution in changing channel environments.
Regulation	Needs right-of-ways and proper infrastructure	Requires spectrum regulation.

Technology Comparisons (Fiber vs. Others)

• Fiber vs Microwave
• Copper vs Fiber Optic Cable Comparison
• Glass Optical Fiber vs Plastic Optical Fiber (GOF vs POF)
• Active vs Passive Optical Networks (AON vs PON)
• 5G vs Fiber Optic

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• Understanding Plastic Optical Fiber
• Fiber Optic Sensors: Types, Working Principles & Applications
• RF Over Fiber: Advantages, Disadvantages & Key Differences
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• Quantum Key Distribution Over Fiber
• Optical Circuit Switching vs Burst Switching vs Packet Switching

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• Optical Wavelength Converters
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• Optical Equalizer Basics
• Optical Transimpedance Amplifier
• Optical Sensors: Advantages & Disadvantages
• Optical Biosensors: Working, Types & Applications