http://hdl.handle.net/10468/224 2017-09-29T07:21:55Z http://hdl.handle.net/10468/4758 Self-starting optical–electrical–optical homodyne clock recovery for phase-modulated signals Sooudi, Ehsan; Ellis, Andrew D.; Manning, Robert J. We propose a novel self-homodyne optical–electrical–optical clock recovery technique for binary phase-shift keying (BPSK) signals using commercial optical and electrical components. We present the principle of operation as well as a proof-of-concept experiment for a 10.7 Gb/s BPSK signal clock recovery transmitted over a dispersion-compensated link of 20 km of single-mode fiber. Suppression of pattern-related frequency noise at the output of the recovered clock is shown. The timing jitter of the recovered clock at 10.7 GHz was measured to be ∼450  fs∼450  fs (integration range: 100 Hz–10 MHz). 2017-09-01T00:00:00Z http://hdl.handle.net/10468/4630 Regrowth-free single-mode semiconductor laser suitable for monolithic integration based on pits mirror Dernaika, Mohamad; Kelly, Niall P.; Caro, Ludovic; Shortiss, Kevin; Peters, Frank H. A regrowth-free single-mode laser that is made using standard UV photolithography is reported. The laser achieves a single-mode side-mode suppression ratio of 37 dB, linewidth of 450 kHz, and tunes across 2.9 nm and is suitable for monolithic integration as a distributed feedback replacement, due to a large free spectral range of 60 nm. 2017-08-22T00:00:00Z http://hdl.handle.net/10468/4276 Tunable L-band semiconductor laser based on Mach–Zehnder interferometer Dernaika, Mohamad; Caro, Ludovic; Kelly, Niall P.; Shayesteh, Maryam; Peters, Frank H. A regrowth-free tunable L-band semiconductor laser based on Mach–Zehnder interferometer is presented in this paper. The laser exhibit a side mode suppression ratio of 38 dB and linewidth of 500 kHz. A tuning range of 30 nm across the L-band is also demonstrated. 2017-07-04T00:00:00Z http://hdl.handle.net/10468/3918 A facetless regrowth-free single mode laser based on MMI couplers Caro, Ludovic; Kelly, Niall P.; Dernaika, Mohamad; Shayesteh, Maryam; Morrissey, Padraic E.; Alexander, Justin K.; Peters, Frank H. This paper presents a facetless, tunable laser operating near 1575 nm, as well as a theoretical model predicting spectral features of the laser. The lasers were fabricated without regrowth or advanced lithography techniques, and are based on MMI couplers and etched facets. Coarse vernier tuning was achieved over a range of 25 nm, while fine, thermal tuning was also demonstrated over a range of 1.5 nm. SMSR values of 25 dB and higher were observed, with a measured laser linewidth of 600 kHz. 2017-04-20T00:00:00Z