Innovation Sphere


  • Seshadri Mohan
  • Rabindra Ghimire



Project TitleLogical Topology Optimization of free space optical networks with tracking transceivers
Track Code2013-018
Short Description

The technology is a transceiver system for automatic tracking and dynamic routing for free space optical (FSO) communication


The transceiver architecture is designed in such a way, that the  transceivers can dynamically orient themselves at different direction to establish a link between two transceivers. The technology also addresses the problem of optimizing and designing logical topology over FSO using tracking transceivers. A novel mathematical formulation has been devised in order to minimize the maximum offered load on any physical link that minimizes congestion in the network.

Tagsdynamic routing, GMPLS, MILP, Free space optical communications (FSO), Optical Network, survivability
Posted DateJan 5, 2015 4:55 PM


Seshadri Mohan
Rabindra Ghimire

Technology Applications

  • Metro network extensions: FSO can be deployed to extend an existing metro ring or toconnect new networks. These links generally do not reach the ultimate end user, but are more an application for the core of the network.
  • Enterprise: The flexibility of FSO allows it to be deployed in many enterprise applications, including LAN-to-LAN connectivity, storage area networking and intra-campus connections. FSO can be deployed in point-to-point, point-to-multipoint, ring or mesh connections.
  • Fiber Complement: FSO may also be deployed as a redundant link to back-up fiber. Most operators deploying fiber for business applications connect two fibers to secure a reliable service plus backup in the event of outage. Instead of deploying two fiber links, operators can deploy an FSO system as the redundant link.
  • Access: FSO can also be deployed in access applications such as gigabit Ethernet access. Service providers can use FSO to bypass local loop systems and to provide FSO-based high capacity links to businesses
  • Backhaul: FSO can be used for backhaul such as LMDS or cellular backhaul as well as gigabit Ethernet “off-net” to transport network backhaul.
  • DWDM Services: With the integration of WDM and FSO systems, independent players aiming to build their own fiber rings may use FSO to complete part of the ring. Such a solution could save rental payment to Innncumbent local exchange carriers, which are likely to take advantage of this situation.LAN-to-LAN connections on campuses at Fast Ethernet or Gigabit
Some other applications are:
  • Speedy service delivery of high-bandwidth access to optical fiber networks.
  • Converged Voice-Data-Connection.
  • Temporary network installation (for events or other purposes).
  • Reestablish high-speed connection quickly (disaster recovery).
  • As an alternative or upgrade add-on to existing wireless technologies.
  • As a safety add-on for important fiber connections (redundancy).
  • For communications between spacecraft, including elements of a satellite constellation.
  •  For inter- and intra -chip communication.
  • For military purposes.

Technology Advantages

  • Due to unregulated bandwidth, FSO becomes an attractive alternative that provides low cost, low power solutions with high security and data rates.
  • Ability to dynamically optimize the network under changing traffic and failure patterns. 
  • Transceivers devised have the ability to dynamically reorient themselves whenever the quality of an existing link deteriorates due to increasing traffic, physical failures or weather conditions such as fog, can be used to solve the last mile access, enterprise connectivity and metro access network issues.
  • High speed transmission, protocol independent, highly secured data and no FCC licensing.

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Intellectual Property

Patent Number Issue Date Type Country of Filing
None None Other Patent None