Spectral　broadening　is　desirable　in　optical　parametric　oscillators　(OPOs)　for　their　tunability　and　generation　of　short　pulses,　which　typically　entails　more　complex　systems　and　increased　costs.　Here,　we　report　large-scale　spectral　broadening　through　the　simple　insertion　of　a　MoTe2　film　into　the　cavity　of　a　femtosecond　OPO　for　the　first　time.　The　OPO　offers　a　tunable　output　ranging　from　1245　to　1552　nm,　and　comparable　broadening　effects　are　observed　in　most　of　the　operating　wavelengths.　The　broadest　spectrum　is　achieved　at　1524　nm　by　inserting　a　low-concentration　1T　＇　-MoTe2　film,　exhibiting　a　spectral　broadening　factor　exceeding　22.　Spectral　broadening　results　in　a　time　compression　correspondingly.　The　narrowest　pulse　is　obtained　by　using　a　low-concentration　2H-MoTe2　film　with　a　pulse　duration　of　88　fs,　and　a　temporal　compression　of　20　of　pulse　duration　is　obtained　at　1417　nm.　The　experimental　results　show　that　the　nonlinear　properties　and　the　film　structure　of　MoTe2　induce　a　local　modulation　of　the　signal　in　the　space-time　domain,　representing　the　main　contribution　to　spectral　broadening.　This　approach　will　offer　new　insights　to　enhance　the　practical　application　of　2D　materials　and　benefit　the　development　of　OPO　devices.