Athermalized low-loss echelle-grating-based multimode dense wavelength division demultiplexer

Area of Science:

• Photonics and Optical Engineering
• Telecommunications Technology
• Fiber Optic Components

Background:

• Wavelength Division Multiplexing (WDM) is crucial for increasing fiber optic communication capacity.
• High-density demultiplexers are needed to efficiently process multiple optical signals.
• Multimode fiber systems require specialized components for signal distribution.

Purpose of the Study:

• To report the development and characterization of a high-density wavelength division demultiplexer (DEMUX).
• To evaluate the performance of the DEMUX in terms of wavelength accuracy, insertion loss, and thermal stability.
• To assess the device's suitability for high-speed data transmission.

Main Methods:

• Fabrication of a high-density DEMUX for eight-channel, 200-GHz spaced signals.
• Characterization of the DEMUX's operational wavelength range (1549.32 to 1560.61 nm) within the ITU grid.
• Measurement of key performance metrics including wavelength accuracy, insertion loss, thermal drift, and adjacent crosstalk.

Main Results:

• The DEMUX successfully demultiplexes eight-channel signals into a 62.5-microm multimode-fiber array.
• Measured wavelength accuracy is within 0.04 nm, with a mean insertion loss of 1.95 dB.
• Thermal testing shows a wavelength thermal drift of less than 0.8 pm/°C over a 20°C to 60°C range, and adjacent crosstalk is better than -45 dB.
• The device supports data transmission rates exceeding 3.5 Gb/s.

Conclusions:

• The developed high-density DEMUX meets stringent performance requirements for optical communication systems.
• Its robust thermal stability and low crosstalk make it suitable for reliable, high-capacity data transmission.
• This component represents a significant advancement in fiber optic signal processing technology.