Abstract
We investigate on the uncooled RSOA driving parameters in WDM reflective PONs, focusing on an upstream path at 1.25 Gbit/s using pure binary modulation. We show how the optimal values change using direct-detection or self-coherent receivers. In particular, for the latter, the driving point optimization allows a gain of more than 3 dB in terms of ODN loss compared to a standard On-Off Keying, generating a quasi-PSK modulation. We also address operating temperature and wavelength dependence issues.
Highlights
Several previous works, such as [1,2,3,4], have clearly shown the potential advantages of WDM reflective Passive Optical Network (PON) using Reflective Semiconductor Optical Amplifier (RSOA) at the Optical Network Unit (ONU) and self-coherent detection at the Optical Line Terminal (OLT)
While it is well known that for a DD receiver, the RSOA optimal driving parameters are those that generate an OOK (On-Off Keying) signal with maximal extinction ratio (ER), we will show that, when using a coherent receiver, they approximate a 2-PSK (Phase Shift Keying) modulation and this setup gives at least 3 dB of gain in terms of Optical Distribution Network (ODN) loss compared to OOK
We evaluate the resulting Bit Error Rate (BER) by off-line processing on approximately 2⋅105 bits
Summary
Several previous works, such as [1,2,3,4], have clearly shown the potential advantages of WDM reflective Passive Optical Network (PON) using Reflective Semiconductor Optical Amplifier (RSOA) at the Optical Network Unit (ONU) and self-coherent detection at the Optical Line Terminal (OLT) Focusing on this scenario and in particular on the upstream path, we present in this paper our recent results on the RSOA parameters optimization. While it is well known that for a DD receiver, the RSOA optimal driving parameters are those that generate an OOK (On-Off Keying) signal with maximal extinction ratio (ER), we will show that, when using a coherent receiver, they approximate a (quasi) 2-PSK (Phase Shift Keying) modulation and this setup gives at least 3 dB of gain in terms of Optical Distribution Network (ODN) loss compared to OOK This key idea, though already introduced in several works by Prof.
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