1. The Type-A solution includes a pair of simplex CWDM MUX DEMUX modules and a pair of 1CH simplex CWDM OADM modules over a single fiber. In this situation, the Tx and Rx of the dual fiber CWDM transceivers use different wavelengths.

2. The Type-B solution includes a pair of simplex CWDM MUX DEMUX modules and a pair of 2CH simplex CWDM OADM modules over a single fiber, with optical circulators inside to realize bidirectional transmission. In this situation, the Tx and Rx of each dual fiber CWDM transceiver uses the same wavelength.

3. The Type-C solution includes a pair of simplex CWDM MUX DEMUX modules and a pair of 2CH simplex dual band CWDM OADM modules over a single fiber, with BiDi CWDM transceivers. In this situation, the Tx and Rx of single fiber BiDi CWDM transceivers use different CWDM wavelengths with at least 60nm spacing.

For the CWDM solutions mentioned above, HTF offers passive CWDM MUX DEMUX and CWDM OADM modules with different packages, including plastic ABS box, metal LGX cassette and 19-inch rack mount. Meanwhile, HTF also offers a series of CWDM transceivers with different form factors, including CWDM SFP, 10G CWDM SFP+, and 10G CWDM XFP.