FIBER OPTIC INTERFACILITY PLATFORMS John A. MacDonald and Allen Katz Linear Photonics, LLC Nami Lane, Suite 7C, Hamilton, NJ 869 69-584-5747 macdonald@linphotonics.com LINEAR PHOTONICS, LLC Bringing Performance to Light!
Microwave Fiber Optic (F/O) Links Microwave (linear) F/O Links used for point-to-point communications Antenna Remoting Sensors Radio-over-Fiber. We present two new system platforms that provide modularity and interchangeability IFL PluraLight. We discuss predistortion linearization for improved F/O Link dynamic range
Components and Modules Linear Photonics is the premier supplier of component and module-level solutions for RF over fiber We now offer the same high-end technology in subsystem platforms IFL RU PluraLight RU
IFL Interfacility Link RU Platform Dual-redundant power supplies Fully hot-swappable plug-ins DiLink up to 4 GHz XiMod up to GHz Passives 6 single-wide / double-wide slots 4
IFL DiLink HF through 4 GHz High dynamic range Single-wide 6 units per RU 5
IFL DiLink Ultra Broadband Unit 4 MHz < db flatness 6
IFL DiLink Bandwidth, Link Gain, Dynamic Range options Downlink/Receive application: lower noise (W,N) Uplink/Transmit application: higher input compression (I) High Dynamic Range Style Gain Freq Link Gain @ centerband Gain Flatness Full Band Gain Flatness any 5 MHz RF Input Compression RF Input IP Link Noise Figure SFDR typical W to 5 +/- +/- db 5 7 W to +/- +/- db +/-.5 db 5 7 W 5 to 5 +/- +/- db +/-.5 db 5 7 W to 4 +/- +/- db +/-.5 db 5 W 5 to 5 5 +/- +/- db +/-.5 db -6 4 W 5 to 5 +/- +/- db +/-.5 db -6 4 W 5 5 to 5 5 +/- +/- db +/-.5 db -6 W 5 to 4 5 +/- +/- db +/-.5 db -6 6 N to +/- +/- db 5 7 9 9 N to 5 +/- +/- db +/-.5 db 5 7 9 9 N 9 to 5 +/- +/- db +/-.5 db 4 7 8 N to 4 +/- +/- db +/-.5 db 8 6 N 5 to 5 +/- +/- db 9 6 N 5 to 5 5 +/- +/- db +/-.5 db 9 6 N 5 9 to 5 5 +/- +/- db +/-.5 db - 5 N 5 to 4 5 +/- +/- db +/-.5 db - 8 8 I to +/- +/- db 7 4 8 I to 5 +/- +/- db +/-.5 db 7 4 8 I 9 to 5 +/- +/- db +/-.5 db 4 9 4 7 I to 4 +/- +/- db +/-.5 db 4 ALL UNITS: Temperature Range to 5 C RF Connector SMA female Optical Connector FC/APC 7
IFL XiMod DC to GHz Receivers High Responsivity Single-wide Post-amplified options 5 GHz Transmitters Double-wide State-of-the-art Dynamic Range 8
IFL XiMod -5 PostamplifiedIFL-XiModLink - Link Gain (db) -5 - Standard IFL-XiModLink -5 DC to GHz Receiver -.5 5.5.5 5.5.5 5.5 Frequency (GHz) IFL XiMod end-to-end Link Gain 5 45 4 5 db 5 (V/W) 5 5 RF O/E Responsivity 5 5 5 GHz Output Return Loss - db - - -4-5 5 5 5 GHz to GHz Amplified Receiver 9
PluraLight Highest density transceiver platform available RU carries 6 single-wide cards Dual-redundant power supplies Passive couplers, WDMs, filters, etc.
PluraLight TRIMOD 4 GHz Transceivers 6 slots per RU Full Duplex (Single RF / Dual fiber) 4 MHz to 4 GHz LINK GAIN s s
Linearity Improvement Linearization: Methods of improving the linearity of a nonlinear network Predistortion Linearization is one technique Employs a nonlinear element in the microwave signal path Operates at instantaneous microwave rate Not limited by delay as in feedback or feedforward approach Not limited by overly complicated component-count Limited primarily by microwave matching, preamplifiers, etc. Linearizer Technology, Inc. (Linear Photonics sister company) has been manufacturing linearizers and linearized networks since 99 Technology is readily applied to fiber optic networks Linearizer Technology, Inc.
Predistortion Linearization Output Power - - - -4-5 Input Power -5-4 - - - 4 Phase - - Input Power -5-4 - - - Nonlinear Device exhibits Gain and Phase Compression
Predistortion Linearization 5 4 Output Power Output Power - - - - - - -4-4 -5 Input Power -5-4 - - - -5 Input Power -5-4 - - - 4 Phase 4 Phase - - - Input Power -5-4 - - - - Input Power -5-4 - - - Nonlinear Device exhibits Gain and Phase Compression Precede it with another nonlinear device that exhibits gain and phase expansion, in conjugate with the device to be linearized (the linearizer) 4
Predistortion Linearization 5 4 - - - -4 Output Power Output Power Output Power - - - - - - -4-4 -5-5 -5 - - - Input Power - - - Input Power - - - Input Power -5-4 -5-4 -5-4 4 4 Phase Phase Phase - - - - - -4 - - -5-5 -4 - - - -5-4 - - - -5-4 - - - Input Power Input Power Input Power Nonlinear Device exhibits Gain and Phase Compression Precede it with another nonlinear device that exhibits gain and phase expansion, in conjugate with the device to be linearized (the linearizer) The desired outcome is an ideal limiter The linearity of an ideal limiter cannot be improved 5
Predistortion Linearization Result is reduction in IMD: SFDR is impacted : (db) with IMD 6
Gain and Phase Transfer 5.7 db.5 db Non linearized P db is 5.7 db from saturation Phase compression rapidly above sat Linearized P db is.5 db from saturation Phase nonlinearity held to < past sat 7
Linearized XiMod 7 linearized 6 8 GHz 6 GHz GHz 4 GHz 5 IMD (dbc) 4 GHz nonlinearized 4, 6, 8,, GHz 4 6 8 4 6 8 Input Power Backoff IPBO (db) Broadband (4- GHz) correction IMD improved ~ db Spur-Free Dynamic Range exceeds db Hz / 8
Correction Bandwidth Two-tone IMD measured with span of MHz and GHz Centered at 9 GHz Pout (dbm) - - - -4-5 -6-7 -8 Linearized MZM Third-Order Products with Varying Carrier Spacing MHz spacing: 8.999 & 9. GHz GHz spacing: 7.5 &.5 GHz P low ( MHz) P low ( MHz) P hi (MHz) P hi (MHz) Plo ( GHz) P lo ( GHz) P hi ( GHz) P hi ( GHz) -9-5 - - -9-7 -5 - - -9-7 -5 Pin / tone (dbm) Linearizer is is effective over broadband instantaneous bandwidth 9
Summary LPL provides state-of-the-art Microwave over Fiber performance DC through + GHz Linearized Links offer record level dynamic range LPL now provides a complete suite of product solutions to fit any application Component Modular Subsystem Platform THANK YOU! Copies of of this this presentation are are available at at Booth 544 544