Promising compact wavelength-tunable optical add-drop multiplexer in dense wavelength-division multiplexing systems

Area of Science:

• Photonics and Optical Engineering
• Telecommunications
• Fiber Optics

Background:

• Optical add-drop multiplexers (OADMs) are crucial components in wavelength-division multiplexing (WDM) networks for signal routing.
• Existing OADM designs often face challenges in compactness, tunability, and insertion loss, limiting their applicability in high-capacity optical communication systems.
• The C-band spectrum is vital for optical amplifiers, necessitating efficient channel selection within this range.

Purpose of the Study:

• To design and model a highly compact and tunable optical add-drop multiplexer (OADM) device.
• To demonstrate the device's capability for selecting a significant number of dense wavelength-division multiplexing (DWDM) channels.
• To evaluate key performance metrics including channel spacing, crosstalk, and insertion loss.

Main Methods:

• The OADM device was designed and modeled using long-period gratings (LPGs).
• Piezoelectric ceramic fiber stretchers were integrated to enable tunability.
• Simulations were performed to analyze channel selection, crosstalk, and insertion loss across the C-band.

Main Results:

• The proposed OADM can select 50 DWDM channel signals within the 1526.25 to 1563.75 nm wavelength range.
• A channel spacing of 0.75 nm was achieved, covering the entire C-band spectrum.
• Crosstalk between channels was measured to be less than -39 dB, with a total insertion loss of approximately 0.24 dB.

Conclusions:

• The designed compact and tunable OADM demonstrates excellent performance for DWDM systems.
• The device's low insertion loss and crosstalk make it suitable for integration into optical networks.
• This OADM technology offers a promising solution for efficient optical signal management in the C-band.