Indoor High-Bandwidth Optical Wireless

This paper explain to me more about technology LASER in implementation on WSN Communication.

This paper can explain more detail. File Size: 1.02 MB.

Indoor High-Bandwidth Optical Wireless Links for Sensor Networks Click Here

Found on IEEE explore website

So, Information about this paper according my understanding is

1) Author Name : 

Jarir Fadlullah, and Mohsen Kavehrad

2) Title Of Paper : 

Indoor High-Bandwidth Optical Wireless Links for Sensor Networks

3) Source : 

IEEE Journals And Magazines, JOURNAL OF LIGHTWAVE TECHNOLOGY, VOL. 28, NO. 21, NOVEMBER 1, 2010

4) Summary Of Reported Research :

In this paper, focus to measurement of Indoor optical wireless communication.

At present, there are high-bandwidth laser transmitters available in the market. This can be built with separated components. For receiver there are high sensitivity component such as Photo Multiplier Tube (PMT) and Avalanche Photo Dioda (APD). But in this paper using  LASER diode as the transmitter and APD as the receiver, and obtain frequency domain responses.

Important Result is about data rate aspect

On data rate aspect, data rate performance is measured in terms of delay spread values and eye diagrams. The eye diagrams show that there is minimal inter-symbol interference for data links operating at 800 Mbps and 1 Gbps. This is an amazing result considering the components used are not specifically optimized for communication.

5) Strength Of Invention:

This paper is the first to demonstrate that laser -based FSO capable of handling data rates up to 1Gbps in indoor optical wireless link. Although using component that not specifically optimized for communication purposes. 

6) Weakness :

At this trial has not considered factors interference between nighbour sensors. Placement sensor important to avoid this problem.

Another problem of laser is shadowing, But solution for this problem is using multispot difuse configuration.

LASER shadowing problem

this picture taken from This Link

7) Limitation:

In this paper, focus to measurement of Indoor optical wireless communication based on LASER technology. Several parameter that observed is Frequency respon vs Size lense with different position, delay spread, and data rate.