This article is 'old but gold'. It was written by Hamid Hemmati back in 2007. This guy was pivotal in earlier days of laser communication, compiling the book on the subject (recently revised) [1].
>Lasers could enable deep-space communication between Earth and planets at the farthest reaches of our solar system. Over the next two decades, optical communications technology is expected to deliver at least an order-of-magnitude higher data rate than conventional radio frequency systems from deep space.
Since this article was written, a number of demonstrations have been successfully completed between satellites, between satellite and ground station, from the International Space Station, and even between planets. Now space laser communication is not only within reach of government and military customers, but has been fully commercialised with projects like Starlink.
The interplanetary internet sees applications in space missions, but I (and many others) expect that it will be pivotal in deploying an 'internet of internets' connecting Earth, the moon and Mars during future manned missions.