We design, build and maintain fiber networks across Bulgaria — from the first splice point through OTDR certification. Scope covers long-haul backbones, access networks (FTTH / FTTx) and in-building structured cabling.

Supported fibre standards

Single-mode (SMF)

  • ITU-T G.652.D — standard single-mode fibre with low attenuation across the full 1260–1625 nm window (“zero water peak”). Default choice for backbone and access networks.
  • ITU-T G.655 — non-zero dispersion-shifted single-mode (NZDSF). Used for long-haul DWDM routes where C/L-band chromatic dispersion management is critical.
  • ITU-T G.657.A1 / A2 — bend-insensitive single-mode with 10 / 7.5 mm minimum bend radius. Used for FTTH drops, in-building cabling and splice-to-the-home installations.
  • ITU-T G.657.B3 — ultra-bend-insensitive with 5 mm minimum bend radius. For micro-cables, drop installs in existing infrastructure and pre-terminated pigtail solutions.

Multi-mode (MMF)

  • OM3 (50/125 μm, laser-optimized) — 10 Gb/s up to 300 m. For data centre spine and building backbone.
  • OM4 (50/125 μm, laser-optimized) — 10 Gb/s up to 400 m; 40 / 100 GbE up to 150 m. Standard choice for enterprise LAN backbones and server rooms.
  • OM5 (wideband multimode, WBMMF) — extended SWDM support (850–950 nm), 100 GbE with fewer channels.
  • OM1 / OM2 — legacy 62.5/125 and 50/125 variants. We maintain existing installations and carry out controlled migration to OM4/OM5.

Measurement and certification

  • OTDR (Optical Time-Domain Reflectometer) — bi-directional trace per fibre, 1310 / 1550 nm for SMF, 850 / 1300 nm for MMF.
  • OLTS / IL / RL — Insertion Loss and Return Loss (ORL) against the link budget per TIA-568 and ISO/IEC 11801.
  • IEC 61300 — connector and passive component testing (mating durability, sealing, vibration).
  • IEC 61280 — end-to-end fibre link attenuation.
  • IEC 60793 / 60794 — optical fibre and cable specifications.

Bulgarian standards

  • BDS EN 50173 — structured cabling for information technology.
  • BDS EN 50174-1/2/3 — installation of communication cabling (planning, indoor and outdoor routes).
  • BDS EN 187000 — optical cables.

Access technologies

GPON (ITU-T G.984), XGS-PON (ITU-T G.9807.1), NG-PON2 (ITU-T G.989), Active Ethernet (IEEE 802.3ah / 802.3ca). Designs are sized with bandwidth upgrade headroom and OPEX minimisation in mind for the lifetime of the optical line terminal (OLT).

Deliverables

  • Surveys, concept and detailed design with cable and splice diagrams.
  • Permits and coordination (construction, road authorities, utilities).
  • Installation — HDD, microtrenching, ADSS aerial, duct infrastructure.
  • Splicing (fusion / mechanical) and connector termination (LC, SC, FC, MPO/MTP, specialist naval-grade).
  • Acceptance testing with bi-directional OTDR reports and as-built documentation.
  • SLA-backed maintenance, 24/7 emergency response and planned maintenance windows.