Experimental Comparison of Optical Phase Conjugation and DCF Aided DWDM 2x10.7Gbit/s DQPSK Transmission

نویسندگان

  • S. L. Jansen
  • D. van den Borne
  • P. M. Krummrich
  • G - D Khoe
  • H. de Waardt
چکیده

The performance of DWDM 2x10.7Gbit/s-DQPSK is assessed comparing mid-link optical phase conjugation (OPC) and DCF for dispersion compensation. We report a 44%-increase in transmission distance resulting from nonlinear phase noise reduction by using mid-link OPC. Introduction Mid-link optical phase conjugation (OPC) is an attractive method for replacing chromatic dispersion compensating fiber (DCF). In mid-link OPC, no dispersion compensating fiber (DCF) is used. Instead the sign of the effective chromatic dispersion is inverted in the middle of the link by OPC. Inherent to the non-periodic inline dispersion map of mid-link OPC is a large dispersion accumulation along the transmission line. It has however been shown that return-to-zero (RZ) differential phase-shiftkeying (DPSK) [1] as well as RZ differential quadrature phase-shift-keying (DQPSK) [2] can cope with large amounts of inline accumulated dispersion, and that hence these modulation formats have a good performance in non-periodic inline dispersion maps. Apart from chromatic dispersion compensation midlink OPC has been shown suitable for reducing the impact of nonlinear effects such as nonlinear phase noise [3]. In this paper, the performance of DWDM 2x10.7Gbit/s DQPSK is assessed comparing two dispersion maps: The classic periodic dispersion map using DCF for chromatic dispersion compensation after each span and the non-periodic dispersion map employing midlink OPC. We show that impairments such as nonlinear phase noise are significantly smaller for DQPSK using mid-link OPC instead of using DCF for chromatic dispersion compensation in case of ultra long-haul transmission. Experimental setup The experimental setups of the DCF and the OPC based configurations are depicted in Fig. 1. In both experiments, the transmitter and receiver structures are the same. At the transmitter, 44 continuous wave (CW) signals on a 50GHz grid are RZ-DQPSK modulated using a RZ pulse carver with a 50% duty cycle and an integrated parallel DQPSK modulator. Two 10.7Gbit/s 2-1 PRBS sequences (one inverted: data A, one not-inverted and 5 bit delayed: data B) are used to generate the DQPSK signal. The recirculating loop consists of three 94.5km spans of standard single mode fiber (SSMF), with an average span loss of 21.5dB. At the span output a hybrid Raman/EDFA structure is used for signal amplification (Raman gain ~11dB). In the OPC based configuration, no DCF is used after each span. In the middle of the link, where the OPC is located, the chromatic dispersion exceeds 80.000ps/nm. Here the signals are fed through a periodically-poled lithium-niobate (PPLN) for OPC where the sign of the effective accumulated dispersion is inverted. As well, the wavelengths are mirrored with respect to the pump signal (from 1546.1nm...1554.5nm to 1532.3nm...1540.6nm). Since the OPC is placed in the middle of the link, the effective accumulated dispersion is around 0ps/nm after transmission. A more detailed description of the OPC based experiment can be found in [2]. In the DCF based configuration, the PPLN for chromatic dispersion compensation is removed and DCF modules are inserted after each span, hence creating a periodic dispersion map. 20% of the DCF is placed between the Raman pump and the first stage of the inline amplifier to balance the DCF insertion loss. In order to optimize the performance of the DCF based transmission system, the optical input power in Fig. 1: Experimental setup ~~ CSF 0.2nm Clock Rec./RX Postcompensation Precompensation λ1 λ44 10.7G clock 10.7G data A

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تاریخ انتشار 2005