Tu'ipulotu, the former Junior All Black, is the Falcons' fourth signing this week following the arrivals of Rory Lawson, Carlo del Fava and Scott MacLeod.
Newcastle's immediate future remains uncertain as they wait for the outcome of the Championship final to discover whether they will be relegated.
But Tu'ipulotu is excited by the prospect of playing under new director of rugby Dean Richards.
"I am truly grateful for the opportunity to join the Falcons again," Tu'ipulotu told the Falcons' official website.
"When I initially left the Falcons for Japan it was a very hard decision for me and my family to make.
"During my time away Semore Kurdi has taken over the club, and it is great to see the progress that has been made under his leadership, especially with the appointment of Dean Richards as director of rugby.
"I am looking forward to being part of a team that strives to perform to the expectations of its loyal supporters."
Newcastle say that more signings are set to be announced in the coming days.
Gilbert has released a new line of rugby cleats. The Gilbert Virtuo 8S is part of the exciting new product. Check it out.
The entire All Blacks apparel line has been updated for 2013/14. Check out the New Zealand All Blacks polo.
The Nike Tiempo is a solid rugby cleat and one of few styles still made from full-grain natural leather.
The Gilbert Blitz 8S rugby cleat is a great cleat at a great price of $69.99. Get a new pair of cleats today.
A cool looking all black rugby cleat with the high performance adidas is known for. Get in the Gear!
Wear the crest of the British and Irish Lions on your t-shirt. A great look for the summer.
The All Blacks Performance t-shirt is black with hints of blue from the training jersey. Very Cool.
The New Zealand All Blacks training jersey for 2013/14. Get in the Gear!
The USA Rugby Pro Alternate rugby jersey is perfect for any fan of the Eagles. Get yours to wear during the summer Test matches.
The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.