PPM-DU (WORKING DOCUMENT, DO NOT PUBLISH) A three DOM Detection Unit in place of an Antares string. Nikhef for KM3NeT: PPM-DU optical network DRAFT!, designed by Nikhef Optical team

λ1λ1 λ2λ2 λ 2 LiNbO3 PPM-DU: Network layout 5) less straight forward approach, 1 SC modulator λ4λ4λ6λ6 50/50? A1 REAM 2xCu DOM1 PIN λ2λ2 C2 A2 High attn = OFF Low attn = ON (callibrated) 20/80 DOM2 DOM3 REAM 2xCu PIN λ6λ6 REAM 2xCu PIN λ4λ4 90/10? Infra SC C2 Infra SC 50/50? D1 LiNbO3 Xx dB Junction Box λ3λ3 λ8λ8 λ8λ8 λ1λ1 ?? λ1λ1 λ3λ3 λ5λ5 λ9λ9 λ10 λ9λ9 λ2λ2 λ4λ4 λ6λ6 DRAFT! D2 VOA manual 6 λ laser- bank 3x λ 4 λ 6 λ 1 λ 3 λ 5 VOA RS-232 D1 (MUX) connections. D2 (DEMUX) connections.Infrastructure Slow Control Ch nr.FuntionWavelength (nm)ITU ch. Ch nr.FuntionWavelength (nm)ITU ch.Ch nr.FuntionWavelength (nm)ITU ch. 1SC DOM n.c Infra SC downstream CW DOM CW DOM Infra SC upstream SC DOM n.c CW DOM CW DOM SC DOM n.c CW DOM CW DOM n.c n.c n.c n.c DU-container Shore station ?

Nikhef for KM3NeT: PPM-DU optical network DRAFT!, designed by Nikhef Optical team Shore station receiver options Photline APD(3x) crate D2 λ2λ2λ4λ4λ6λ6 Electrical switch Crate (SMA)* *The electrical switch crate switches between: Receiver output <> electrical SS crate Receiver output <> Timing mode structure Selects one of the Receiver outputs for timing measurement APD SFP optical Rx SFP SMA SFP interconnect 3x *Manual rerouting the fiber to a suitable receiver for timing measurement. * * * SFP optical Rx SFP SMA SFP interconnect 3x * * * D2 Suitable Receiver

Infrastructure Slow Control Nikhef for KM3NeT: PPM-DU optical network DRAFT!, designed by Nikhef Optical team Ethernet <> Fiber (sfp)Fiber(sfp) <>Ethernet Ethernet switch (4 port) NE-4110S λ9λ9 λ10 SFP module: λ j ust out of C-band for future use. Are add/drop available for this λ? Infrastructure Slow Control Ch nr.FuntionWavelength (nm)ITU ch. 9Infra SC downstream Infra SC upstream Spare ethernet Ethernet to 1 x RS-232 EDFA A2 (True RS232) Ethernet to 1 x RS-232 Digi. VOA (True RS232?) Ethernet to 1 x RS-232 EDFA A2 (True RS232) Ethernet to 1 x RS-232 spare Ethernet to 1 x RS-232 Or ethernet AC/DC conv (True RS232 or ttl?)

Ethernet <> Fiber (sfp)Fiber(sfp) <>Ethernet Gbe switch (5port) Ethernet to 1 x RS-232 1x spare TTL serial Ethernet to 1 x RS-232 1x spare TTL serial Ethernet to 1 x RS-232 1x spare TTL serial Ethernet to Spare 1x RS-232 1x TTL serial Ethernet to 1 x RS-232 AC/DC conv (True RS232 or ttl?) EDFA A2 True RS232 Digital Con- trollable VOA (True RS232?) EDFA A1 True RS232 AC/DC Converter monitoring (True RS232 or ttl?) ??? PC/laptop RJ45 2x Optical LC RJ45 IDC DB9* ??? IDC? Mating cable ?? *DB9 is only used in the test bench. When installing in DU-container IDC will be used. A1 A2 Nikhef for KM3NeT: PPM-DU optical network DRAFT!, designed by Nikhef Optical team Optional + +

Nikhef for KM3NeT: PPM-DU optical network DRAFT!, designed by Nikhef Optical team ProCon +No wavelength dependend components in DOM-A1 needs to amplify CW and modulated data (needs to be tested) +Separate infrastructure Slow Control-More fiber from VEOC to DU foot. +If broadcast for three DOMs doesn’t work a point to point connection-Very few similarities with the final network for KM3NeT connection is still possible (only shore station needs to be upgraded)-Timing loop problems not solved yet (no test time) -Pin DIODE's need extra attenuation to protect it from high power of EDFA A1