Optical Transponder

DQT 400

DQT 400 Optical Transponder

Product Overview

The DQT400 is part of XKL’s DarkStar DWDM Transponder family of products, and is based on XKL’s DarkStar architecture, the foundation for addressing today’s IT challenges and scalable growth. These systems enable customers to soft-configure the aggregation of 100GE and 400GE services. Network managers only need to swap the client optics in order to migrate from 100GE to 400GE.

There are no licensing fees or additional costs to enable the 400G channels. The DQT400 utilizes the latest pluggable coherent technologies to enable metro and long-haul connectivity for high-speed data networks. DQT400 systems install in under 30 minutes and are available in 1 rack unit (1U) or 2 rack unit (2U) configurations.

The DQT400 utilizes the DarkStar DMD Mux/Demux in order to aggregate up to 48 channels at 400G per channel, or 96 channels at 100G per channel, on a single fiber pair. Alternatively, the DQT400 can provide alien wave injection into an existing customer network. The DQT400 systems are fully tunable and allow for a customer to grow their network to 19.2Tb in 5U of rack space. A 12-channel DQT400, transporting 4.8Tb of bandwidth, uses only 470W.

Network administrators can deploy and commission these systems in a fraction of the time it takes to deploy traditional optical transport equipment. Setting up the management network, as well as configuring services, are done in minutes.

  • 1 Year hardware warranty
  • Zero cost software updates
  • Zero license fees
  • Ultra-high Bandwidth, 1.6Tb per DQT400-4 system
  • Highly scalable systems, stackable up to 4.8Tb connectivity
  • Low-power, minimal cooling, and a compact (1U) footprint

XKL’s DQT400 solution is fully capable of meeting the demands of today, with scalability to meet the network capacity requirements for the future.

Technical Features

The DQT400 is part of XKL’s Transponder family of products and is based on the XKL FlexArc architecture. The family of products are easily integrated, and with our distributed architecture, capacity can be added as needed.


Integrated System Architecture:

    • DWDM Solution.
    • Tunable system (based on ITU grid).
    • 100GE – 400GE.
    • QPSK, 16QAM.

System Level Features:

    • Hot-swap components:
    • 1+1 redundant power supplies, supports AC and DC.
    • Redundant fans.
    • Optical transceivers: QSFP28, QSFP-DD.
    • Field-replaceable C-Band Tunable OSFP transceivers; 400G ZR and 400G ZR+ transceivers supported.
    • Dual flash storage modules; one is write-protected.
    • Hitless software upgrades—no customer data loss.
    • System-wide watchdog timer to ensure software response.

Client Services:

    • Soft-configurable encapsulations (per port):
    • Ethernet: 100G, 4x100G, 400G,
    • Physical Interface support for:
    • 100GBase-SR4, 100GBase-LR4, 100GBase-DR1, 400GBase-SR8, 400GBase-LR4, 400GBase-DR4

Line Side:

    • 1,2,3,4 or 12 100G/400G DWDM (soft-configurable)
    • Tunable OSFP transceivers


    • 1.6T (DQT400 4-ch), 4.8T (DQT400 12-ch) per system
    • Stack DQT400 systems to provide up to 19.2T using the DMD Mux/Demux
    • Stack DQT400 systems along with DQT10, DQT100 systems for backwards compatibility using DMD Mux/Demux filter

Field Replaceable Units:

    • Hot-swap client-side transceivers (Non-Coded)
    • Replaceable line-side transceivers (Non-Coded)
    • Replaceable Optical Service Channel transceivers
    • Hot-swap power supplies (1+1 Redundant)
    • Hot-swap fans units

Supported Topologies:

    • Point to Point
    • Protected Point to Point (requires DMD-A)
    • Linear
    • Ring
    • Mesh
    • Chassis Options: 1U

Lean On Us

Contact us today for a free consultation with top level engineers who will architect a solution before you buy.

Customers Rave

“I have lots of problems to solve, but the XKL equipment isn’t one of them.”

JPIX, VP of Operations

“Trouble tickets went down 60% after the XKL equipment was installed.”

Smithsonian, IT Director

“The XKL systems have been rock solid and low touch since instillation.”

 Tenent, Network Engineer

U.S. Toll Free (866) 802-2777

Outside U.S. +1 (425) 497-6590
24 Hour Customer Support
U.S. Toll Free (866) 949-8340
Outside U.S. +1 (608) 807-0033