Athermal colourless C-band optical transmitter for passive optical networks

Automatic Wavelength Allocation Method Using Rayleigh Backscattering for a WDM-PON With Tunable Lasers

“…However, an optical spectrum analyzer or a tunable filter is required to measure the wavelength. A wavelength stabilization method that uses a digital supermode distributed Bragg reflector was also proposed [7]. However, burst errors during wavelength tuning degrade the reliability of the system.…”

Wavelength initialization employing wavelength recognition scheme in WDM-PON based on tunable lasers

“…Though these principles seem to be relatively simple method, they are inappropriate solutions for practical deployment of WDM-PON since they utilized expensive and bulky devices. As another approach [8], an optical transmitter (Tx) using a digital super mode-distributed Bragg reflector (DS-DBR) has been also proposed. Unfortunately, their application is limited to only the tunable laser which has a same physical structure.…”

“…Therefore, it has been regarded as a key issue to implement optical transceiver of optical network units (ONUs) in WDM-PON based on tunable lasers [3]. There have been many attempts to resolve these problems [6][7][8][9]. It utilized a planar lightwave circuit type Mach-Zehnder interferometer-arrayed waveguide grating (AWG) [6] or a tunable wavelength filter [7].…”

Fast operational wavelength initialization technique of wavelength division multiplexed‐passive optical network based on tunable laser diode using back reflection of tunable filtered light

“…Therefore, it is very necessary to implement wavelength self‐initialization in ONT . There have been many kinds of researches on the wavelength self‐initialization of WDM‐PON system . It utilizes a Fabry–Perot etalon filter in each transmitter or tunable wavelength filter .…”

“…However, it is difficult to be appropriate solutions of WDM‐PONs due to the high‐implementation cost and bulky characteristics. As another approach, optical transmitter (OTx) using digital supermode‐distributed Bragg reflector is proposed . It is limited to the laser with a same structure.…”