The IT network products specialist said its order intake for the year totalled US$470mln, up 6% on the previous year, and revenue gained 6% to US$477mln.
Growth was led by its networks and security division, boosted by demand for 400G high-speed ethernet testing services.
Revenue was also supported by a US$10mln contribution from one-off business with a US defence contractor, which the company does not expect to be repeated in 2019.
The Lifecycle Service Assurance business only saw modest revenue growth due to a major reorganisation in the key customer base.
Spirent said the Connected Devices arm delivered “strong profit growth” in the year, driven by effective cost management.
Following efforts to mitigate higher inflation with cost cuts, the company now expects adjusted operating profit of US$75mln to US$77mln, up 30% on the prior year and above analysts’ estimates.
The group had cash of just over US$120mln at the end of the period after dividend payments.
Shares rose 7.3% to 134.35p in morning trading.