Enhanced 3D-CAP modulation with information-inserted time slots for seven-core fiber transmissions

Area of Science:

• Optical Communications
• Signal Processing
• Fiber Optics

Background:

• Traditional three-dimensional carrier-less amplitude phase (3D-CAP) modulation faces limitations in optimizing bit error rate (BER) performance.
• Achieving higher data rates in optical fiber transmission requires advanced modulation techniques.

Purpose of the Study:

• To propose and experimentally validate an enhanced 3D-CAP modulation scheme with information-inserted time slots.
• To demonstrate improved BER performance and reduced up-sampling factors compared to traditional 3D-CAP.

Main Methods:

• Development of an enhanced 3D-CAP modulation technique incorporating information into time slot positions.
• Experimental setup for a 43.75 Gb/s MIMO-free transmission over a 2 km weakly coupled 7-core fiber.
• Comparative analysis of the proposed scheme against traditional 3D-CAP-16.

Main Results:

• The enhanced 3D-CAP scheme successfully achieved 43.75 Gb/s MIMO-free transmission.
• A performance improvement of 2.7 dB in receiver sensitivity was observed in core-1 compared to traditional 3D-CAP-16.
• The experiment highlighted a 1.7 dB variation in receiver sensitivity across different fiber cores due to geometrical factors.

Conclusions:

• The proposed enhanced 3D-CAP modulation offers superior BER performance and efficiency.
• This technique is a viable solution for high-capacity optical fiber communication systems.
• The method effectively reduces the up-sampling factor, leading to better overall system performance.