Abstract
We demonstrate detailed characterization results of a hybrid InP-TriPleX photonic integrated tunable laser based on silicon nitride microring resonators. A tuning range of 50 nm across the C-band, side-mode suppression ratio (SMSR) >50 dB, high output power (∼10 dBm), linewidth of <80 kHz across the whole tuning range, and μs switching speed are achieved. The delayed self-heterodyne (DSH) method is used for the linewidth measurement, the lowest linewidth can be achieve is ∼35 kHz. The FM noise spectrum is also measured to show the 1/f noise and white noise characterization. Furthermore, the device demonstrates performance comparable with commercial external cavity lasers in 64-QAM coherent system.
Highlights
Tunable semiconductor lasers, which can provide wide wavelength tuning range, high side-mode suppression ratio (SMSR), high output power, narrow linewidth and fast switching speeds are highly desirable for dense wavelength division multiplexing (DWDM) systems in current core networks and potentially in future optical access networks [1]
We demonstrate detailed characterization results of a hybrid InP-TriPleX photonic integrated tunable laser based on silicon nitride microring resonators
The pigtailed hybrid laser assembly has two optimized optical interfaces: the InP coupled to the TriPleX photonic integrated circuit (PIC), forming the hybrid tunable laser cavity; and the TriPleX PIC coupled to the polarisation maintaining (PM) fiber output
Summary
Tunable semiconductor lasers, which can provide wide wavelength tuning range, high side-mode suppression ratio (SMSR), high output power, narrow linewidth and fast switching speeds are highly desirable for dense wavelength division multiplexing (DWDM) systems in current core networks and potentially in future optical access networks [1]. In DWDM networks, the use of coherent detection technology combined with advanced modulation formats is being employed to achieve higher spectral efficiencies to overcome the capacity limitations of current network implementations. Among various types of tunable lasers, the external cavity lasers (ECL) can exhibit narrow linewidth due to their long cavity length and recent work [4] has demonstrated an ECL with linewidths below 10 kHz that are suitable for higher order modulation in coherent optical systems. In [11], we initially characterize the tuning map, the relative intensity noise (RIN), linewidth, and switching time of the MRR-ECL based on the TriPleX waveguide platform, before demonstrating its performance in a 16-QAM coherent transmission system. We apply the device in a coherent 64-QAM transmission system as the laser source, and achieve similar performance to a commercial ECL in a coherent 64-QAM transmission system
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