Do Gigabit ethernet single-mode fiber network adapters exist?

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http://serverfault.com – I am attempting to set up a server with a total of four single-mode fiber ports - two need to be at least 1Gb and two must be 10Gb. I have found a variety of 10Gb single-mode fiber network adapters (for example the Intel X520-LR1 and the QLogic 3242-LR), but no 1Gb single-mode fiber adapters. Do they exist? I will only have two PCI-E x8 slots (unless I am forced to get a larger server), so both network adapters would need to have two ports. A bit of a side question, but what do you recommend for dual port single mode fiber adapters for a Linux server? Thanks for the help! (HowTos)