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50 Gb/s short-reach interconnects with DSP-free direct-detection enabled by CAPS codes
Optics Express
|August 17, 2018
Summary
Combined amplitude and phase shift (CAPS) codes enable 50 Gb/s optical transmission up to 20 km without dispersion compensation. This low-cost solution offers superior dispersion tolerance compared to other modulation schemes for mobile Xhaul applications.
Area of Science:
- Optical communications
- Fiber optic transmission systems
Background:
- Mobile Xhaul networks require high-speed, cost-effective optical interconnects.
- Existing modulation schemes face limitations in dispersion tolerance and complexity.
Purpose of the Study:
- To demonstrate a novel modulation scheme for enhanced optical transmission.
- To evaluate the performance of combined amplitude and phase shift (CAPS) codes in C-band fiber optic systems.
- To compare CAPS signaling with other 50 Gb/s modulation formats.
Main Methods:
- Experimental demonstration of 50 Gb/s transmission using CAPS codes over 0-20 km single mode fiber.
- Direct detection without digital signal processing (DSP).
- Comparison with On-Off Keying (OOK), 4-level Pulse Amplitude Modulation (PAM4), and dispersion precompensated OOK.
- Testing of IQ duobinary modulation format.
Main Results:
- Achieved 50 Gb/s transmission below a 10^-3 bit error rate (BER) up to 20 km using CAPS.
- CAPS demonstrated superior dispersion tolerance over OOK, PAM4, and dispersion precompensated OOK.
- Maximum bit rate of 67 Gb/s achieved with CAPS at 10 km.
- IQ duobinary enabled 50 Gb/s over ~17 km.
- CAPS showed low OSNR penalty in an ASE-limited regime.
Conclusions:
- CAPS coding offers a cost-effective, high-performance solution for mobile Xhaul applications.
- The proposed CAPS signaling is robust against dispersion, simplifying system design.
- CAPS outperforms other tested modulation schemes in terms of dispersion tolerance and reach.
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