| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 463472 | Optical Fiber Technology | 2011 | 4 Pages |
Differential phase-shift keying (DPSK) demodulations operated by a structured fiber Bragg grating (FBG) filter and by a Mach–Zehnder delay interferometer (MZDI) in a single-ended configuration are compared. Experimental measurements at 10 Gb/s demonstrate that a specially designed FBG outperforms an integrated-optic MZDI of ∼4 dB and ∼3.5 dB in back-to-back and after 25-km propagation, respectively. Both demodulators show low polarization sensitivity and signal frequency detuning dependence, but only MZDI operating point requires a thermal control. FBG filter proves an interesting solution for DPSK demodulation in low-cost applications and, moreover, can be designed to match colorless requirements of wave division multiplexed passive optical network (WDM-PON) applications.
Research highlights► A Fiber Bragg Grating (FBG) is employed as a DPSK demodulator at 10 Gb/s. ► The FBG mimics the reflectance of Mach–Zehnder delay interferometer. ► BER comparison with single-ended MZDI is made also after 25-km propagation. ► FBG demonstrate low-polarization sensitivity similar to actively-stabilized MZDI. ► FBG-based DPSK detectors are suitable for low-cost colorless WDM-PON ONUs.
