There are two parts to the ticket... the Certificate of Offence which the officer files with the court and the Notice of Offence which the officer gives to you.
The Certificiate of Offence definitely needs to be signed. If it is not signed, then it is a fatal error. But the only way to determine whether it is signed or not, is to go to the Clerk's officer and request a copy of it.
Now I know @argyll above says the Notice of Offence that you received does not need to be signed. However I think (but am not 100% sure) that it also must be signed...
I believe Provincial Offences Act section 3(2)(b) which says that it must be signed:
"3(2) A provincial offences officer who believes that one or more persons have committed an offence may issue, by completing and signing in the form prescribed under section 13, (b) either an offence notice indicating the set fine for the offence or a summons. 2009, c. 33, Sched. 4, s. 1 (2)."
Provincial Offences Act R.S.O. 1990, CHAPTER P.33
PART I - COMMENCEMENT OF PROCEEDINGS BY CERTIFICATE OF OFFENCE
Certificate of offence and offence notice
3. (1) In addition to the procedure set out in Part III for commencing a proceeding by laying an information, a proceeding in respect of an offence may be commenced by filing a certificate of offence alleging the offence in the office of the court. R.S.O. 1990, c. P.33, s. 3 (1).
Issuance and service
3. (2) A provincial offences officer who believes that one or more persons have committed an offence may issue, by completing and signing in the form prescribed under section 13,
(a) a certificate of offence certifying that an offence has been committed; and
(b) either an offence notice indicating the set fine for the offence or a summons. 2009, c. 33, Sched. 4, s. 1 (2).
This following case law, at paragraph 18 supports that section 3(a) says the Certificate of Offence MUST be signed, which means it should also apply to the Notice of Offence in 3(b):
R. v. McPherson, 2012 ONCJ 807 (CanLII) http://canlii.ca/t/fvrkp
[18] Sections 3(2)(a)&(b) of the POA are of further guidance. These sections set out that an officer may issue a Certificate of Offence but must complete and sign it to certify an offence has been committed and she/he has issued either an Offence Notice including the Set Fine or a Summons.