An inclined coupling between laser and fiber scheme to reduce optical reflection with a spot-size converter integrated laser diode

Aburakawa, Yuji; Ohtsuka, Hiroyuki; Araki, K.

doi:10.1109/50.803028

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…(l) and (2), we get RIN value for different sub-canter frequencies as a function of offset (d,d). Fig.2 represents RIN for f=l GHz and 150 MHz for a system with connector [16]. It is observed that RIN is gradually improved with the increase of offset for a typical fiber of length 10 Km.…”

Section: Resultsmentioning

confidence: 98%

“…We neglect contribution of fiber dispersion in RIN, as one can exploit dispersion less window. Considering one limiting condition as The amount of undesirable light re-coupled to fiber can be approximated as [15,16] qr being the re-coupling efficiency and optical reflection co-efficient of the laser diode output facet.…”

Section: Theorymentioning

confidence: 99%

“…Iph (=Pr p) is the detector current at the receiving end where p is Opto/Electronic conversion efficiency of the detector and P, is the power received by the detector and given by [ 16 ] Pr PLD 1…”

Section: Rsof Representingmentioning

confidence: 99%

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Optimization of fiber-laser coupling with respect to both the coupling efficiency and carrier-to-noise ratio: a novel design

Mondal¹,

Shi²

52nd Electronic Components and Technology Conference 2002. (Cat. No.02CH37345)

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Fiber-coupled laser diodes are indispensable for optical fiber communications. The design of laser-fiber coupling is often guided by maximizing the optical power coupled into fiber, and by relaxing the fiber-laser alignment tolerances. The most of them are susceptible to optical back-reflections from the fiber resulting in not only a reduced coupling efficiency but also an increased optical noise of the signal. The high bit rate transmission through optical fiber is degraded by reflected intensity noise (RIN) due to multiple reflections from refractive index discontinuities. An offset misaligned coupling scheme involving lensed fiber is proposed to reduce reflected intensity noise. The effect of such misalignment on back reflection is studied theoretically. The results show a significant improvement in the reflected intensity noise and carrier to noise ratio (CNR). Such an improvement of RIN and CNR is important for maintaining quality of laser and highspeed data transmission. The results enable one to optimize the design of any laser-fiber coupling with respect to CNR. The coupling scheme finds potential application in Metro-area network and also for long-haul communication to improve RIN and CNR. 0-7803-7430-4102/$17.00 02002 IEEE

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Section: Resultsmentioning

confidence: 98%

Section: Theorymentioning

confidence: 99%