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Dispersion Compensation Module

Gabriel Gendron

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The ClearSpectrum™ DCML is a compact chromatic dispersion compensator that features both low insertion loss and the lowest latency on the market. The channelized nature of the fiber Bragg gratings used in the DCML prevents interchannel and intrachannel nonlinear impairments such as self-phase modulation and four-wave mixing crosstalk. These features enable the DCML to handle high optical input power, giving it the flexibility to be used as a pre-compensator before the fiber link or as a post-compensator at the receiver end. The DCML provides full C-band coverage on either a 50 or 100 GHz grid, addressing up to 96 channels with a single device on the 50 GHz grid. All of this performance is packed inside a passive, environmentally-rugged package that operates reliably even outside plant.

System vendors who serve communication and internet service providers (CSP & ISP) are looking for ways to increase data rates in next-generation DWDM networks. In particular, data-center interconnect (DCI)/enterprise , fiber-to-the-premises (FTTx) and 5G X-Haul networks using intensity modulation direct detection (IMDD) require a simple, cost-effective, and reliable chromatic dispersion compensation solution when increasing the reach and data rate under which they operate. TeraXion's FBG-based DCML have been widely deployed as essential components of regional and metropolitan networks for more than 15 years. The DCML has dominated the FBG-based dispersion compensation market because the proven-reliable, compact modules are a totally passive solution that features ultra-low latency and low-insertion-loss.

  • TeraXion's channelized FBG technology mitigates both interchannel and intrachannel nonlinear impairments.
  • The compact ClearSpectrum™ DCML efficiently compensates chromatic dispersion with less than two meters of fiber—much less than the kilometers of fiber required for DCF modules, reducing link latency by 20%.
  • The ClearSpectrum™ DCML is a completely passive device, making it ideal for access networks with limited electrical power budget.

Top 6 Features

Ultra-Low Latency

The ClearSpectrum™ DCML features a latency of less than 25 ns, a reduction of over 1000x compared to dispersion compensating fiber (DCF), making it the perfect choice for latency-critical networks.

Efficient

ClearSpectrum™ DCML channelized FBGs minimizes the generation of non-linear effects, such as self-phase modulation and four-wave mixing, enabling the use of higher transmission power levels.

Compact

The ClearSpectrum™ DCML has dimensions of only 162 x 20 x 9 mm, including the optical circulator.

Reliable

ClearSpectrum™ DCML units are in use within critical networks worldwide and continue to operate after more than 15 years.

Passive

The ClearSpectrum™ DCML is a completely passive, FBG-based device that uses no electrical power.

Rugged

The ClearSpectrum™ DCML’s  athermal package is certified for operation in temperatures ranging from -5 °C to 70 °C (an extended-range version ranging from -40 °C to 85 °C is available for outside plant applications).

Critical technical specifications

Label Value

Compensation Level

20 km to 200 km

Channel Spacing

50 GHz and 100 GHz

Latency

<25 ns

Operating Temperature

Standard range: -5 °C to 70 °C
Extended range: -40°C to 85°C