How Multiplexing Techniques Deliver Higher Speeds on Fiber Optic Cabling

The Different Multiplexing Techniques:

Different multiplexing techniques are enabling the evolution of network speeds on fiber optic cabling.

 

Time Division Multiplexing is simply a way of transmitting more data by using smaller and smaller increments of time, and multiplexing lower data rate signals into a higher speed composite signal.  

 

Space Division Multiplexing, more commonly known as parallel optics or parallel fibers, is a way of adding one or more lanes simply by adding one or more optical fibers into the composite link.

 

Wavelength Division Multiplexing is signaling simultaneously across multiple lanes segregated by different wavelengths (colors) of light that are multiplexed into and out of a single fiber.

 

Multiplexing Techniques Which Enable The Evolution of Network Speeds

There are a range of different Multiplexing Techniques which enable the evolution of network speeds through fiber optic cabling. Let’s take a look at each one of these techniques in a little bit more detail below;

 

TECHNIQUE 1: TIME DIVISION MULTIPLEXING

With Time Division Multiplexing, lower speed electrical signals are interleaved in time and transmitted out on a faster composite lane.

 

So the higher resultant data rate would be multiple times the individual rates going in.

 

There are examples used today where Ethernet rates are achieved using such parallel electrical signals, combined in a multiplexer and serialized over fiber. For instance, 10Gbps Ethernet has four lane options where each of the lanes is at a quarter rate of 2.5Gbps.

 

Today’s top speed per lane is 25Gbps for Ethernet, and looking to the future, 50Gbps lane rates are being developed.

 

With the higher rates, more complex multi-level code schemes are used to get more bits through with each symbol. This is an indication that maximum speed limits are being reached and so alternative techniques are used to increase the composite lane speed.

 

TECHNIQUE 2: SPACE DIVISION MULTIPLEXING

One of the other techniques is to add more lanes to the composite channel, known as Space Division Multiplexing. A lane in this scenario is physically another fiber strand. It’s an alternative to TDM lanes described above, where signals merged each in time on the same fiber.

 

There are a number of examples of this technique being used in the industry. 40G SR4 for example delivers 40Gbps over multi-mode fiber using four lanes or fibers. That’s four lanes in one direction and four lanes in the other direction.  That’s also what the four on the end of ‘SR4’ means, four lanes of 10Gbps each.

 

The standard for the 100Gbps solution uses 10 lanes of 10Gbps called SR10.  There is also a second generation of 100G that has increased the lane rate to 25Gbps and that delivers 100G using four lanes, so mixing the improvements in TDM and parallel optic techniques to achieve the goal of higher speeds.

 

Taking this further from four lanes in each direction up to 16 or 24 lanes, speeds of 200Gbps, 400Gbps and beyond are made possible. However there are pragmatic limits. Clearly a four lane solution is more practical than a 24 lane solution if you can get away with it.

 

TECHNIQUE 3: WAVE DIVISION MULTIPLEXING

Going above 16 or 24 lanes is a diminishing return because it drives more cost into the cabling system. That’s where the third multiplexing technique, wave division multiplexing comes in.

 

As the name implies, the wavelength band available for transmission is divided into segments each of which can be used as a channel for communication. It is possible to squeeze many channels into a small spectrum. The common versions used for long haul, singlemode systems are called Dense Wave Division Multiplexing DWDM or Coarse Wave Division Multiplexing CWDM. In multimode systems, Short Wavelength Division Multiplexing techniques are appearing.

 

With short wavelength division multiplexing, wavelengths are used in the lower cost short wavelength range around 850nm to add lanes within a single strand of optical fiber.  

 

An example of this on the market today is Cisco’s 40G BD, or Bi-Di. Bi-Di stands for bidirectional and the signals are transmitting in both directions in each optical fiber strand, using two different wavelengths to discriminate between the reflections that might happen.  

 

This technique uses 20Gbps per wavelength in each of two fibers and that way they can get 40Gbps through the 2 core fiber channel using a duplex LC connector.