© The Institution of Engineering and Technology
A photonic versatile waveform generator based on phase modulation in a Sagnac loop is proposed and experimentally verified. A continuous-wave light is modulated by a sinusoidal signal in a phase modulator to generate optical sidebands. Combined with a polariser, the Sagnac loop is used to manipulate the carrier of the modulated signal. Then, a fibre Bragg grating is applied to attenuate one of the first-order sidebands. By properly choosing the modulation index and the polarisation state of the light wave output from the Sagnac loop, versatile waveform sequences can be generated. In the demonstrating experiment, full-duty-cycle sawtooth, triangular and square waveform sequences are successfully generated. The proposed photonic microwave waveform generator features the advantages of a simple structure, low cost, being free from bias drift and tunability in repetition rate.
References
-
-
1)
-
2. Huang, C.B., Leaird, D.E., Weiner, A.M.: ‘Time-multiplexed photonically enabled radio-frequency arbitrary waveform generation with 100 ps transitions’, Opt. Lett., 2007, 32, (22), pp. 3242–3244 (doi: 10.1364/OL.32.003242).
-
2)
-
4. Li, W., Wang, W.T., Zhu, N.H.: ‘Photonic generation of radio-frequency waveforms based on dual-parallel Mach–Zehnder modulator’, IEEE Photonics J., 2014, 6, (3), p. 5500608, .
-
3)
-
1. Khan, M.H., Shen, H., Xuan, Y., et al: ‘Ultrabroad-bandwidth arbitrary radiofrequency waveform generation with a silicon photonic chip-based spectral shaper’, Nat. Photonics, 2010, 4, (2), pp. 117–122 (doi: 10.1038/nphoton.2009.266).
-
4)
-
6. Dai, B., Gao, Z.S., Wang, X., et al: ‘Generation of versatile waveforms from CW light using a dual-drive Mach-Zehnder modulator and employing chromatic dispersion’, J. Lightwave Technol., 2013, 31, (1), pp. 145–151 (doi: 10.1109/JLT.2012.2225827).
-
5)
-
3. Ye, J., Yan, L.S., Pan, W., et al: ‘Photonic generation of triangular-shaped pulses based on frequency to time conversion’, Opt. Lett., 2011, 36, (8), pp. 1458–1460 (doi: 10.1364/OL.36.001458).
-
6)
-
7. Gao, Y.S., Wen, A.J., Liu, L., et al: ‘Compensation of the dispersion-induced power fading in an analog photonic link based on PM-IM conversion in a Sagnac loop’, J. Lightwave Technol., 2015, 33, (13), pp. 2899–2904 (doi: 10.1109/JLT.2015.2420658).
-
7)
-
5. Liu, W., Yao, J.: ‘Photonic generation of microwave waveforms based on a polarization modulator in a Sagnac loop’, J. Lightwave Technol., 2014, 32, (20), pp. 3637–3644 (doi: 10.1109/JLT.2014.2312819).
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2015.4430
Related content
content/journals/10.1049/el.2015.4430
pub_keyword,iet_inspecKeyword,pub_concept
6
6
Photonic versatile waveform generation based on phase modulation in Sagnac loop