Electronically controlled VOA for C-band CWDM/DWDM links—0–30 dB range, ms-level response, low insertion loss/PDL, and closed-loop power control for stable, receiver-safe operation.
The DVOA – Dynamic Variable Optical Attenuator provides precise, remotely managed attenuation to equalize power across spans, protect receivers, and stabilize multi-wavelength systems during adds/moves/changes. With ms-level response and fine step resolution, DVOA enables soft-start ramping at EDFA inputs, per-channel or composite power leveling in ROADM nodes, and loss emulation during commissioning.
Closed-loop modes maintain target output under traffic changes using integrated feedback or external OLPM/OCM telemetry. The module fits HYD 1U/2U/5U platforms (hot-swappable card) or a 1U stand-alone unit and integrates via Web/CLI/SNMP and Netconf/YANG for automated workflows.
Attenuation range: 0–30 dB (others on request); resolution: ≤0.1 dB; high repeatability
Optical performance: low IL (typ. ≤1.0 dB), low PDL (typ. ≤0.2 dB), high return loss
Speed & stability: ms-level response; soft-start ramp; transient-safe equalization
Control modes: manual (open-loop), APC/AGC constant-power modes; profiles & thresholds
Management: Web/CLI/SNMP, Netconf/YANG; alarms, logs, dry-contact relays
Wavelengths: C-band (≈1528–1565 nm); wideband options 1260–1650 nm
Interfaces: LC/UPC standard (LC/APC, SC variants optional); G.652/G.657 SMF
Form factors: plug-in card for HYD 1U/2U/5U or 1U rack device
Use cases: EDFA input leveling, ROADM equalization, OLP tuning, commissioning loss emulation, receiver protection
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