I believe the 40g and 100g optics are already muxing 4 channels within the transceiver before outputting it to 1310. https://community.fs.com/blog/40gbase-lr4-qsfp-transceiver-links-cwdm-and-ps... Luke Guillory Vice President – Technology and Innovation Tel: 985.536.1212 Fax: 985.536.0300 Email: lguillory@reservetele.com Reserve Telecommunications 100 RTC Dr Reserve, LA 70084 _________________________________________________________________________________________________ Disclaimer: The information transmitted, including attachments, is intended only for the person(s) or entity to which it is addressed and may contain confidential and/or privileged material which should not disseminate, distribute or be copied. Please notify Luke Guillory immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mail transmission cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. Luke Guillory therefore does not accept liability for any errors or omissions in the contents of this message, which arise as a result of e-mail transmission. . -----Original Message----- From: NANOG [mailto:nanog-bounces@nanog.org] On Behalf Of Lewis,Mitchell T. Sent: Tuesday, June 19, 2018 11:27 AM To: NANOG Subject: Tunable QSFP Optics Does anyone know if any Single Mode QSFPs exist on the market that use wavelengths other than 1310nm (either self tunable or factory tuned)? I am looking to put more than one 40gb link on a fiber pair similar to using DWDM OADMs for 1g & 10g but can't seem to find any qsfp optics that don't use 1310nm. Thanks. Regards, Mitchell T. Lewis [ mailto:MLewis@TechCompute.Net | MLewis@TechCompute.Net ] [ http://linkedin.com/in/mlewiscc ] |203-816-0371 PGP Fingerprint: 79F2A12BAC77827581C734212AFA805732A1394E [ https://pgp.mit.edu/pks/lookup?op=get&search=0x2AFA805732A1394E | Public PGP Key ]