Optical Bypass Protection

Optical Bypass Protection keeps traffic flowing when an in-line network element (e.g., OEO, security probe, monitoring node) loses power or is taken out for maintenance. Installed on the line side, the module monitors optical levels and device power; if a fault is detected, it instantly connects the bypass path to bridge the working fiber end-to-end—maintaining service without truck rolls.
Configurable auto/forced/manual modes, revertive logic, and hysteresis prevent flaps. Low insertion loss, high return loss, and minimal PDL ensure stable multi-wavelength operation in CWDM/DWDM networks from 10G to 400G. The unit fits HYD 1U/2U/5U platforms or is available as a 1U stand-alone device, integrating with NMS/Web/CLI/SNMP (optional Netconf/YANG) and dry-contact alarms for clean O&M.

• Protection type: 1×2 / 2×2 bypass (bidirectional pair)

• Triggers: loss of power, LOS/degrade, manual switch; revertive/non-revertive

• Switching time: <10 ms typical; hold-off & hysteresis timers

• Optical performance: low IL (through/bypass), high return loss, low PDL/PMD

• Wavelengths: 1260–1650 nm (O–L bands); CWDM/DWDM compatible

• Interfaces: LC/UPC standard (LC/APC, SC variants optional); G.652/G.657 SMF

• Management: NMS/Web/CLI/SNMP; optional Netconf/YANG; dry-contact relays

• Form factors: plug-in card for HYD 1U/2U/5U or 1U rack unit

• Use cases: maintenance bypass, in-line device fail-safe, software upgrade window protection