GLC-LH-SM LX optics for less than 1m distance?

Hi,

Dumb question, but our MSP has asked us to hook a supplied ME3400 switch to a BT EAD ADVA box using SMF.

The distance is less than a meter away and they've supplied a 1m OS2 SMF cable.

They've also supplied a GLC-LH-SM optic for the ME3400 and the ADVA box has an unbranded LX optic in it.

My question is, is it appropriate to run LX optics this close together without an attenuator?

The EAD circuit is 1Gbps and the ADVA box can terminate copper RJ45 as well as SFP modules. We mentioned this at the time but the MSP is adamant that their CPE and the BT ADVA box be connected together using LX optics on SMF.

Should I suggest the use of a different medium such as copper or MMF optics or an attenuator or is it me that's got my wires crossed? :)