Optical Communication Comparison Guide | Optical Transceiver Technology丨C-LIGHT

By C-LIGHT Marketing 丨 Mar 5, 2026

1310 nm and 1490 nm are the two primary wavelengths in PON access networks. 1310 nm carries upstream traffic from the ONT to the OLT. 1490 nm carries downstream traffic from the OLT to the ONT. Attenuation, laser type, coexistence, and power budgets differ between the two.

1310nm vs 1550nm

By C-LIGHT Marketing 丨 Mar 4, 2026

1310 nm and 1550 nm are two single-mode fiber windows. 1310 nm offers zero chromatic dispersion and moderate attenuation. 1550 nm offers the lowest attenuation and supports DWDM and coherent transmission. Reach, laser type, cost, and applications differ between the two

1270nm vs 1310nm

By C-LIGHT Marketing 丨 Mar 3, 2026

1270 nm and 1310 nm are the upstream wavelengths of XGS-PON and GPON. Attenuation, dispersion, laser type, burst-mode operation, coexistence, and power budgets differ between the two.

1310nm vs 1330nm

By C-LIGHT Marketing 丨 Mar 2, 2026

1310 nm is the zero-dispersion wavelength of standard single-mode fiber, used in PON upstream and duplex 10G links. 1330 nm pairs with 1270 nm in BiDi transceivers for single-fiber bidirectional transmission.

1550nm vs 1570nm

By C-LIGHT Marketing 丨 Mar 1, 2026

1550 nm is the C-band minimum-loss window used in long-haul DWDM, coherent transmission, and PON video overlay. 1570 nm sits at the start of the L-band, extending DWDM capacity beyond the C-band.

Single Mode Fiber vs Multimode Fiber

By C-LIGHT Marketing 丨 Feb 28, 2026

Single-mode fiber carries one propagation mode over a 9 µm core for long-reach transmission. Multimode fiber carries many modes over a 50 or 62.5 µm core for short-reach links.

SR vs DR

By C-LIGHT Marketing 丨 Feb 27, 2026

SR and DR are two optical reach classes for parallel single-lane and multi-lane transceivers. SR uses multimode fiber at 850 nm for short-reach intra-rack links. DR uses single-mode fiber at 1310 nm for 500-meter parallel single-mode links.

DR vs FR

By C-LIGHT Marketing 丨 Feb 26, 2026

DR and FR are two optical reach classes for single-mode fiber transceivers. DR uses parallel single-mode lanes at 1310 nm for 500-meter links. FR uses CWDM wavelengths at 1310 nm for 2-kilometer links

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