Methods and devices for management of cables for co-packaged optics

Abstract

A fiber optic cable management device and method of the same are provided. The fiber optic cable management device comprises a plurality of storage elements, each storage element comprising at least a top panel, a bottom panel, a back panel, and an interior cavity positioned therein, and at least one aperture extending through the back panel. The fiber optic cable management device further comprises each storage element including at least one cable management feature positioned therein and configured to interact with at least one fiber optic cable positioned in the interior cavity to maintain a minimum bend radius of the at least one fiber optic cable. Each storage element defines one or more predetermined storage pathways, each of the one or more predetermined storage pathways providing for a different length variation of the at least one fiber optic cable within the interior cavity.

Description

METHODS AND DEVICES FOR MANAGEMENT OF CABLES FOR COPACKAGED OPTICSCROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to U. S. Provisional Patent Application No.63 / 779,579, filed March 28, 2025, entitled " Methods and Devices for Management of Cables for Co-Packaged Optics," which is hereby incorporated by reference in its entirety.FIELD OF THE DISCLOSURE

[0002] The present disclosure relates generally to network communications equipment, and more particularly to devices, methods, and systems for managing fiber optic cables within co-packaged optics modules and related optical network equipment.BACKGROUND OF THE DISCLOSURE

[0003] Cables, such as those used for communication optical fiber, are often routed within communications equipment cabinets, connecting devices such as high-performance computing (HPC) modules, server enclosures, and data center (DC) packet switches. These cabinets are designed to guide incoming optical cables and their corresponding fibers into connection terminals in an organized manner.

[0004] While optical fiber cabling has long been used in this way for box-to-box connections in DCs and HPC facilities, its application inside equipment enclosures is an emerging technology, being introduced to meet the growing demand for high-speed, robust, and scalable network solutions. This shift introduces new challenges for box designers and builders, who may need to integrate fiber optic infrastructure into their designs. Unlike traditional cabling, fiber optics require careful handling to maintain their reliability. Due to their sensitivity to bending, assemblers, often unfamiliar with these considerations, may inadvertently introduce performance degrading issues such as microbends or improper connector seating.

[0005] In the congested surroundings inside functional elements, traditional fiber optic cable management methods are reaching their limits in terms of capacity, precision, and space optimization, requiring new approaches to routing, securing, and maintaining these cables efficiently. Improvements in the foregoing are desired.BRIEF SUMMARY OF THE DISCLOSURE

[0006] In data centers, rack assemblies include enclosures such as packet switches, high-performance computing (HPC) modules, and servers that house core network infrastructure. Traditionally, these enclosures relied on pluggable optical modules at the faceplate, allowing straightforward replacement of failed modules. However, as data centers evolve to support increasing bandwidth demands, co-packaged optics (CPO) technology integrates optical components directly inside the enclosure rather than confining them to removable modules. This approach increases bandwidth and reduces energy consumption per bit transmitted but creates new challenges in managing potentially thousands of optical fibers inside the CPO box. The boxes are typically crowded with non-optical components, operate at high temperatures, and face ongoing pressure to shrink in volume. Unlike pluggable modules that can be easily removed from the faceplate, repairing an internal optical link in a CPO architecture may require replacing the box.

[0007] One of the main challenges is ensuring proper fiber length management. Cables that are too long may be improperly arranged, leading to excessive bends or buckling that degrade signal integrity. Cables that are too short limit flexibility during installation and rework. Additionally, variations in cable length due to manufacturing tolerances complicate deployment, making a structured and repeatable approach to fiber organization desirable. While mock-ups of CPO modules often appear neat, real-world implementations tend to be messier, with fiber infrastructure occupying significant space and poorly controlled layouts increasing the risk of excessively tight bends that cause high insertion loss or reduce fiber reliability.

[0008] In various embodiments described herein, effective fiber management within CPO housing is provided by a sequence of fiber optic cable storage elements that accountfor both maintenance accessibility and operational needs. The fiber optic cables are organized in a controlled manner that avoids excessive bending while ensuring accessibility for future maintenance through a locking feature that enables selective removal of individual storage elements. The locking feature extends through apertures in each storage element and can be moved between a first position, where it secures the elements in a fixed position through compressive force, and a second position, where it releases the elements to enable individual elements to be selectively slid outwards while maintaining the positions of other elements.

[0009] In some embodiments, the storage elements with at least one opening are configured to enable optical fiber cables to exit perpendicular to the plane defined by the storage element surface. This configuration enables fibers to pass through adjacent storage elements in the stack, maximizing space efficiency while maintaining proper bend radius control. The elements further include multiple predetermined storage pathways to accommodate different fiber lengths, with distinct exit pathways directing fibers toward the openings. This approach ensures efficient fiber organization while facilitating individual element access for maintenance, rework, or replacement without disturbing the entire assembly. Furthermore, the storage elements may be integrated into an assembly that is designed for installation into the co-packaged optics module as a preassembled unit, enabling cable connection and installation. This assembly may be configured to be introduced as a unit into the co-packaged optics module, facilitating the connection of optical fibers to one or more connectors within the module. Once integrated, the assembly ensures organized fiber management, minimizing the risk of signal degradation and optimizing overall system performance.

[0010] / Additionally, some embodiments include coplanar fiber routing configurations where successive straight sections of fiber optic cables lie in the same plane, enabling simple free-space bridging curves such as circular arcs or S-bends between routing elements. This coplanar design ensures that fiber transitions occur within a defined plane, eliminating complex three-dimensional fiber or cable configurations that can be difficult to control and reproduce consistently during assembly. The storage elements may also incorporate visual identification systems such as color coding or physical markers on thestorage elements or routing hardware to simplify assembly and maintenance by providing clear visual cues for tracing specific fibers through the routing system. In some embodiments, a polarization-maintaining storage element may be included within the stack for managing polarization-maintaining fibers that originate from external laser modules.

[0011] In an example embodiment a fiber optic cable management device is provided. The fiber optic cable management device comprises a plurality of storage elements, each storage element of the plurality of storage elements comprising at least a top panel, a bottom panel, a back panel and an interior cavity positioned therein, the back panel extending vertically between the top panel and the bottom panel, and at least one aperture extending through the back panel, wherein a back panel of a first storage element of the plurality of storage elements is positioned adjacent an interior cavity of a second storage element of the plurality of storage elements. The fiber optic cable management device further comprises each storage element including at least one cable management feature positioned therein and configured to interact with at least one fiber optic cable positioned in the interior cavity to maintain a minimum bend radius of the at least one fiber optic cable. Each storage element defines one or more predetermined storage pathways, each of the one or more predetermined storage pathways providing for a different length variation of the at least one fiber optic cable within the interior cavity. The fiber optic cable management device further comprises each storage element comprising an opening from the interior cavity to enable the at least one fiber optic cable to pass therethrough.

[0012] In some embodiments, the fiber optic cable management device further comprises a locking feature, having a first position and a second position, configured to extend through the at least one aperture of each storage element of the plurality of storage elements and configured to secure the plurality of storage elements in a fixed position relative to one another. In some embodiments, when the locking feature is in the second position the locking feature is at least partially withdrawn from at least one storage element of the plurality of storage elements. In some embodiments, when the locking feature is in the second position the locking feature releases at least one storage element of the plurality of storage elements from the fixed position and allows selective removal of at least one storage element of the plurality of storage elements. In some embodiments, when thelocking feature is in the second position the at least one storage element of the plurality of storage elements is configured to slide outwards from between adjacent storage elements.

[0013] In some embodiments, when the locking feature is in the first position, the locking feature holds the plurality of storage elements against one another through a compressive force, and wherein the locking feature is rotatable between the first position and the second position. In some embodiments, the opening is configured to allow the at least one fiber optic cable to exit perpendicular to a plane defined by the top panel of the storage element. In some embodiments, the opening of the plurality of storage elements are aligned to enable the at least one fiber optic cable to pass through adjacent storage elements of the plurality of storage elements,

[0014] In some embodiments, each storage element of the plurality of storage elements comprises one or more storage pathways, and wherein each storage pathway of the one or more storage pathways is configured to accommodate a different length of the at least one fiber optic cable. In some embodiments, the at least one fiber optic cable from one storage element of the plurality of storage elements pass through the openings of adjacent storage elements, and wherein the fiber optic cables are configured to be displaced when an adjacent storage element is removed to permit removal of the adjacent storage element without disconnecting the fiber optic cables.

[0015] In some embodiments, the fiber optic cable management device further comprises comprising a cable guide positioned adjacent to the plurality of storage elements, the cable guide configured to direct the at least one fiber optic cable along a predetermined bend radius. In some embodiments, at least one storage element of the plurality of storage elements comprises a polarization-maintaining storage element configured to manage polarization-maintaining fibers. In some embodiments, at least one fiber optic cable transitions between routing elements via a free-space bridge, wherein tangent vectors of the fiber optic cable at entry and exit points of the free-space bridge are coplanar, enabling the free-space bridge to follow a planar curve, and wherein the planar curve comprises a circular arc or an S-bend. In some embodiments, at least one of the plurality of storage elements or a routing structure includes a visual identification system comprising color coding or physical markers.

[0016] In another example embodiment a fiber optic cable management device for a co-packaged optics assembly is provided. The fiber optic cable management device comprises a plurality of storage elements, each storage element of the plurality of storage elements comprising at least a top panel, a bottom panel, a back panel and an interior cavity positioned therein, the back panel extending vertically between the top panel and the bottom panel, and at least one aperture extending through the back panel, wherein a back panel of a first storage element of the plurality of storage elements is positioned adjacent an interior cavity of a second storage element of the plurality of storage elements. The fiber optic cable management device further comprises each storage element including at least one cable management feature positioned therein and configured to interact with at least one fiber optic cable positioned in the interior cavity to maintain a minimum bend radius of the at least one fiber optic cable, wherein each storage element defines one or more predetermined storage pathways, each of the one or more predetermined storage pathways providing for a different length variation of the at least one fiber optic cable within the interior cavity. The fiber optic cable management device further comprises each storage element comprising an opening from the interior cavity to enable the at least one fiber optic cable to pass therethrough. The fiber optic cable management device further comprises a locking feature, having a first position and a second position, configured to extend through the at least one aperture of each storage element of the plurality of storage elements and configured to secure the plurality of storage elements in a fixed position relative to one another.

[0017] In some embodiments, when the locking feature is in the second position, the locking feature is at least partially withdrawn from at least one storage element of the plurality of storage elements, releases at least one storage element from the fixed position, and allows selective removal of at least one storage element configured to slide outwards from between adjacent storage elements. In some embodiments, the opening of the plurality of storage elements are aligned to enable the at least one fiber optic cable to pass through adjacent storage elements of the plurality of storage elements.

[0018] In some embodiments, at least one fiber optic cable from one storage element of the plurality of storage elements pass through the openings of adjacent storage elements,and wherein the fiber optic cables are configured to be displaced when an adjacent storage element is removed to permit removal of the adjacent storage element without disconnecting the fiber optic cables. In some embodiments, at least one fiber optic cable transitions between routing elements via a free-space bridge, wherein tangent vectors of the fiber optic cable at entry and exit points of the free-space bridge are coplanar, enabling the free-space bridge to follow a planar curve, and wherein at least one fiber optic cable follows a path with a first tangent vector and a second tangent vector that are parallel and coplanar and joined by an S-bend. In some embodiments, at least one of the plurality of storage elements or a routing structure includes a visual identification system comprising color coding or physical markers,

[0019] In another example embodiment a method of accessing a storage element in a fiber optic cable management device is provided. The method comprises providing a housing with a plurality of storage elements aligned in a stacked configuration, each storage element configured to maintain a minimum bend radius for at least one fiber optic cable. The method further comprises rotating a locking feature from a first position to a second position and at least partially withdrawing the locking feature from the plurality of storage elements. The method further comprises identifying a storage element of the plurality of storage elements to be accessed. The method further comprises disconnecting optical connectors associated with a fiber optic cable routed through the identified storage element while fiber optic cables routed through other storage elements of the plurality of storage elements remain connected. The method further comprises removing the identified storage element from the stacked configuration. The method further comprises returning the storage element to the stacked configuration after adjustment of the at least one fiber optic cable.

[0020] In some embodiments, removing the identified storage element comprises sliding the identified storage element outwards from between adjacent storage elements while other storage elements of the plurality of storage elements remain in position on the locking feature, and wherein the method further comprises rotating the locking feature from the second position to the first position to reapply a compressive force securing the plurality of storage elements after returning the storage element to the stacked configuration.BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Having thus described embodiments of the present disclosure in general terms, reference may now be made to the accompanying drawings, which are not necessarily drawn to scale, and wherein:

[0022] FIG. 1A illustrates a perspective view of an example enclosure for a rack assembly, in accordance with some embodiments disclosed herein;

[0023] FIG. IB illustrates a perspective view of the enclosure of FIG. 1A with a panel removed, showing a plurality of co-packaged optics assemblies disposed therein on racks, in accordance with some embodiments discussed herein;

[0024] FIG. 1C illustrates a schematic view of a co-packaged optics assembly of FIG.IB, having various electrical and optical components therein, in accordance with some embodiments discussed herein;

[0025] FIG. 2A illustrates a perspective view of a fiber optic cable management device positioned on a co-packaged optics assembly, such as the co-packaged optics assembly of FIG. 1C, comprising a plurality of storage elements, in accordance with some embodiments discussed herein;

[0026] FIG. 2B illustrates a schematic view of an example storage element of the plurality of storage elements of FIG 2A, including locking features and storage pathways, in accordance with some embodiments discussed herein;

[0027] FIG. 2C illustrates a schematic view of another example storage element of the plurality of storage elements of FIG. 2A, including locking features and storage pathways, in accordance with some embodiments discussed herein;

[0028] FIG. 2D illustrates a schematic top view of an example management device with a plurality of storage elements, in accordance with some embodiments discussed herein;

[0029] FIG. 2E illustrates a cross-sectional view of an example management device, in accordance with some embodiments discussed herein;

[0030] FIGs. 3A and 3B illustrate schematic views of a plurality of fiber optic connection devices positioned on the co-packaged optics assembly of FIG. 1C, including coplanar sections and a free-space bridge, in accordance with some embodiments discussed herein; and

[0031] FIG. 4 illustrates a flowchart of an example method of accessing a storage element in a stacked configuration of a management device, in accordance with some embodiments discussed herein.DETAILED DESCRIPTION

[0032] Exemplary embodiments of the present disclosure are described more fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the present disclosure are shown. Indeed, the present disclosure may be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein; rather, these embodiments are provided so that this disclosure satisfies applicable legal requirements. Like reference numerals refer to like elements throughout. It should be noted that throughout this description, the terms “series,” “stack,” and “array” are used interchangeably to refer to the arrangement of a plurality of storage elements which may be configured either horizontally adjacent to one another or vertically stacked, depending on specific implementation and orientation of the fiber optic cable management device.

[0033] Due in part to its extremely wide bandwidth and low noise operation, optical fiber is increasingly being used for a variety of applications, including but not limited to broadband voice, video, and data transmission. Fiber optic communications networks may include a number of interconnection points (such as at which multiple optical fibers are interconnected) and / or connection terminals (for example, including network access point (NAP) enclosures, optical network terminals (ONTs), network interface devices (NIDs)). Accordingly, corresponding fiber optic cables may be managed (e.g., routed through, split, reconfigured, connected, etc.) in many different communications equipment cabinets and other enclosures.

[0034] The connection terminals may be used to extend fiber optic communications services to a subscriber. In this regard, fiber optic networks may deliver “fiber-to-the-curb” (FTTC), “fiber-to-the-business” (FTTB), “fiber-to-the-home” (FTTH) and “fiber-to-the-premises” (FTTP), referred to generically as “FTTx.” For example, delivering services to subscribers in the last mile connection may occur indoors. Furthermore, different kinds of buildings may require complicated cabling systems, which can include many separated cables, each one connecting one subscriber.

[0035] Co-packaged optics is an emerging technology designed to improve the efficiency and performance of fiber optic communications by integrating optical components directly with application-specific integrated circuits (ASICs), central processing units (CPUs), or graphics processing units (GPUs) within network equipment. Unlike traditional network designs where optical transceivers are located at easily accessible faceplates, CPO extends optical pathways deeper into the equipment enclosure, requiring precise fiber management within the confined spaces of the enclosures. This shift presents new challenges in routing and securing fiber optic cables, as variations in cable length and improper handling can lead to excessive bending, pinching, or damage that compromises signal integrity. Effective length management solutions ensure reliable connections, facilitate maintenance, and support the growing demand for high-bandwidth, low-latency data transmission in modern fiber optic networks.

[0036] Some interconnection points include enclosures, such as rack assemblies, that are used in places such as data centers, network rooms, central offices, and / or m intent- based networking. For example, fibers are often organized and managed within standardized 19-inch racks, although other size racks are contemplated herein. Such racks are designed to hold and protect fiber optic cables (e.g., fibers). These enclosures are beneficial for making sure that fiber connections stay strong and reliable, especially in environments like data centers, where lots of data is being transmitted between servers and other equipment.

[0037] Systems and assemblies according to the present disclosure enable the management of fiber optic cable length within confined enclosures, ensuring proper routing and organization to maintain signal integrity and facilitate maintenance. Additionally, thedisclosed solutions support efficient installation and rework, enabling reliable and scalable fiber optic connections in high-density network environments, including those utilizing co¬ packaged optics technology.

[0038] While some of the illustrated and described embodiments focus on use of various embodiments in rack assemblies, any type of enclosure or structure is contemplated for use with various embodiments. For example, the disclosed systems and assemblies may be employed in many different fiber optic management scenarios, such as in optical fiber distribution hub cabinets, multi-dwelling unit cabinets, front-end and / or back-end cabinets, closures, or other terminals. In some embodiments, various concepts and designs may be easily adjusted for any communications equipment. Likewise, while some example assemblies may be illustrated in a certain orientation, any orientation is contemplated herein.

[0039] Referring to FIGs. 1A and 1B, an enclosure 10 is shown. FIG. 1A shows the enclosure 10 that includes an outer housing 20 and a door 24. FIG. 1B shows the enclosure 10 with the door 24 removed. Within the enclosure 10 is a rack assembly 28 that holds a plurality of co-packaged optics assemblies 30. For example, in some embodiments, the plurality of co-packaged optics assemblies 30 may each include a plurality of fiber optic cable management devices and one or more cable management components (along with other components that are part of the co-packaged optics modules), as will be discussed in greater detail herein. In some embodiments, such enclosures may include, e.g., a 19-inch rack assembly in an environment such as a data center or a network room. The rack assembly 28 may be used to manage cable(s) and / or fiber(s) that connect directly to downstream optical communications equipment, such as network switches or routers, housed in the same 19-inch rack assembly. Although a 19-inch rack assembly is shown in FIGs. 1 A-1B, it should be appreciated that the embodiments disclosed herein may include any other type of fiber optic enclosure and are not limited to a 19-inch rack assembly. For example, the concepts presented herein may be scaled for different rack standards such as 21 -inch or 23-inch rack assemblies, or a system that does not utilize a rack at all may be used as well. Further, any height of the racks or enclosures may be compatible with the disclosures herein. For example, various embodiments are compatible with different sizedI Ihousings, such as 1U, 2U, 4U, 6U, 8U, etc. In some embodiments, the co-packaged optics module may be configured to mount like a book in a rack, with its spine being oriented vertically. For example, a module might have dimensions of 4 rack units (RU) high and 1 RU wide, with the optical infrastructure positioned to maximize space efficiency within this compact form factor. As noted herein, although the co-packaged optics assemblies 30 are shown in a horizontal orientation, other orientations, such as vertical are contemplated as well.

[0040] FIG. 1 C illustrates a co-packaged optics assembly 100 which may be positioned within the rack assembly 28 of FIGs. 1A-1B. The co-packaged optics assembly 100 may include a co-packaged optics housing 103 which houses a plurality of optical and electrical components. For example, an assembly may feature the plurality of optical and electrical components on a main board 120 of the housing 103 comprising the below described components. The housing 103 of the co-packaged optics assembly 100 may include a plurality of fiber optic connection devices 102a, 102b, 102c, 102d, such as may be referred to as a bank of fiber optic connection devices or a bank of cassettes. The plurality of fiber optic connection devices may include as many fiber optic connection devices as needed and may fit in the co-packaged optics assembly 100. In some embodiments, the co¬ packaged optics assembly 100 may include only one fiber optic connection device.

[0041] In an example embodiment, the co-packaged optics assembly 100 may include a first fiber optic connection device 102a, a second fiber optic connection device 102b, a third fiber optic connection device 102c, and a fourth fiber optic connection device 102d. The first fiber optic connection device 102a may include a housing configured to store at least a portion of at least one fiber optic cable therein and one or more connection features, such as may be referred to as multi-fiber connector blocks, configured to receive one or more optical fibers from the at least one fiber optic cable and to provide connection capability to enable data communication with the one or more optical fibers. The second fiber optic connection device 102b may include a housing configured to store at least a portion of at least one fiber optic cable 118a therein and one or more connection features, such as may be referred to as multi-fiber connector blocks, configured to receive one or more optical fibers from the at least one fiber optic cable 118a and to provide connectioncapability' to enable data communication with the one or more optical fibers. The third fiber optic connection device 102c may include a housing configured to store at least a portion of at least one fiber optic cable 118b therein and one or more connection features, such as may be referred to as multi-fiber connector blocks, configured to receive one or more optical fibers from the at least one fiber optic cable 118b and to provide connection capability to enable data communication with the one or more optical fibers. The fourth fiber optic connection device 102d may include a housing configured to store at least a portion of at least one fiber optic cable therein and one or more connection features, such as may be referred to as multi-fiber connector blocks, configured to receive one or more optical fibers from the at least one fiber optic cable and to provide connection capability to enable data communication with the one or more optical fibers,

[0042] The one or more connection features serve as connection points for incoming and outgoing optical signals, enabling high-density fiber connections for data transmission. The one or more connection features may be configured to receive one or more optical fibers from the at least one fiber optic cable 118a, 118b and may provide connection capability to enable data communication with the one or more optical fibers. The at least one fiber optic cable may extend from the one or more connection features into the housing 103 of the co-packaged optics assembly 100. The housing 103 of the co-packaged optics assembly 100 may further include memory components 106a, 106b proximate to a central processing unit (CPU) 108, which may collectively handle data processing operations within the co-packaged optics assembly 100.

[0043] The co-packaged optics assembly 100 may further incorporate one or more of an application-specific integrated circuit (ASIC) 114 which serve as components of the optical data path. The one or more ASIC 114 enable high-speed data transmission by converting electrical signals to optical signals and vice versa, reducing power consumption and latency. The one or more ASIC 114 may include and may be surrounded by one or more photonic chips (see FIG. 2A), such as also may be referred to as photonic integrated circuits (PIC). The ASIC-PIC connection enables high-bandwidth power-efficient electronic processing and optical communication, with the one or more ASIC 114 handling data processing and generating electrical signals, while the PIC converts electrical signalsinto optical signals for high-speed transmission. Furthermore, the housing may further include electronic interface circuits (EICs) (not shown) conditioning the signals as they pass between the one or more ASIC 114 and the PICs, ensuring proper signal integrity' and compatibility. Furthermore, the one or more photonic chips in the co-packaged optics assembly 100 enables high-speed data transmission by converting electrical signals to optical signals and vice versa, reducing power consumption and latency. The one or more photonic chips also improve signal integrity and efficiency by minimizing energy loss, enhancing bandwidth, and enabling compact integration of a plurality of optical and electronic components. As shown in FIG. 1C, one or more of the fiber optic cables 118a, 118b, each connected to the one or more connection features and a portion of each stored within the housing of the second fiber optic connection device 120b and the third fiber optic connection device 102c, may be connected to the one or more ASIC 114 via a PIC.

[0044] FIG, 1C further illustrates a plurality of laser modules 104, which provides the light sources needed for optical signal transmission. The plurality of laser modules 104 connect to the rest of the optical system through a plurality of polarization-maintaining fibers (PMFs) 116a, 116b, The PMFs 116a, 116b preserve the polarization state of the transmited light, which is useful for maintaining signal integrity in advanced optical communication systems. The PMF fibers 116a, 116b extend from external laser small form-factor pluggables (ELSFPs) and are routed to appropriate connection points within the assembly. Additionally, the PMF fibers 116a, 116b are configured to handle high optical power levels for splitting between multiple signal channels at the photonic integrated circuit (PIC). The PMF fibers 116a, 116b ensure stable and reliable transmission by preventing polarization drift, which may be needed in CPO systems. While FIG. 1C illustrates two PMF fibers 116a, 116b any number of PMF fibers and PMF fiber lengths may be contemplated.

[0045] Single-mode fiber (SMF) cables 118a and 118b, with for example 16 fibers per cable, provide input / output (IO) connectivity between the assembly and external network components. These SMF cables 118a and 118b carry the data signals to and from the co¬ packaged optics assembly 100, enabling high-bandwidth, low-latency communication across the network. The high fiber count m these bundles reflects the data capacity ofmodern network equipment. In some embodiments, the PMF fibers 116a, 116b and the SMF cables 118a and 118b may form a Y structure, that may be formed by the bundling together of the PMF fibers 116a, 116b and the SMF cables 118a and 118b. The furcation is where the branches join the trunk, a furcation structure constituting the branching region of the Y-branch portions where the PMF fibers 116a, 116b join one or more of the SMF cables 118a and 118b. As used herein, furcation refers to the process of reinforcing and protecting individual optical fibers by enclosing them in a furcation tube or sleeve. This may be done when fibers are separated from a multi-fiber cable for easier handling, termination, or splicing. Furcation helps prevent fiber breakage, minimizes stress on delicate fibers, and improves overall durability during installation and maintenance. In this context, furcation also refers to a structure in which two fiber optic cables on one side are combined into one cable on the other. The furcation structure may take various forms, including but not limited to protective housings, simple junction points, or transition regions where fiber paths converge or diverge, and does not require any particular protective function or enclosure.

[0046] In some embodiments, the arrangement of the plurality of fiber optic connection devices 102a, 102b, 102c, 102d may be modified to accommodate different form factors or connection requirements. For example, plurality of fiber optic connection devices 102a, 102b, 102c, 102d may be consolidated into a single bank on one side of the assembly, or they may be distributed along multiple edges of the main board 120. In some embodiments, the position and number of photonic chips may vary. Some implementations may utilize a single, larger photonic chip that handles all optical-to-electrical and electrical-to-optical conversions, while others may employ multiple smaller chips distributed throughout the assembly to minimize fiber routing distances.

[0047] In some embodiments, cooling fans may be incorporated and positioned strategically throughout the co-packaged optics assembly 100. These cooling fans could be placed near heat-generating components such as the CPU 108, ASIC 114, photonic chips, or laser module 104 to maintain optimal operating temperatures. The placement of cooling fans may influence the routing of fiber cables, as airflow paths need to remain unobstructed while still maintaining proper fiber bend radii and organization.

[0048] The system components discussed above and the fiber infrastructure in the co¬ packaged optics assembly 100 often occupies a significant amount of space, which can lead to challenges with managing the limited free space available for fiber organization within the enclosure and for cable routing. Fiber routing through the co-packaged optics assembly 100 follows predetermined paths with controlled bend radii to preserve signal integrity. Fibers are connected at one end to the front panel (via multifiber or single-fiber adapter blocks) or to laser modules, etc., and at the other to the one or more photonic chips, where optical-to-electrical or electrical-to-optical conversion occurs. As will be described in greater detail herein, the co-packaged optics assembly 100 is designed to permit organized fiber paths while accommodating the space constraints of the co-packaged optics environment. This allows optimization in performance while minimizing cable signal loss and interference.

[0049] FIG, 2A illustrates a fiber optic cable management device 200 that comprises a plurality of storage elements, such as may be referred to as accumulators, and may be positioned within the housing 103 of the co-packaged optics assembly 100. As will be discussed in greater detail herein, the plurality of storage elements of the fiber optic cable management device 200 provide organized storage for excess fiber length, ensuring proper bend radius maintenance while enabling efficient space utilization. The fiber optic cable management device 200 accommodates variations in fiber length due to manufacturing tolerances and different routing paths, such as may be used to enable a single standard cable length to be used for multiple connections within the co-packaged optics assembly 100. For example, cables connecting from the front of the assembly 100 to nearby components may require more storage capacity than cables that must traverse the entire length of the assembly 100, as the shorter external routing distance results in more excess cable length that must be stored within the storage element.

[0050] The implementation of the fiber optic cable management device 200 within the co-packaged optics assembly 100 addresses several challenges in modern fiber optic systems. The fiber optic cable management device 200 enables precision management of excess fiber length, preventing loose loops that could become tangled or damaged. The fiber optic cable management device 200 may also provide a structured approach to fiberrouting that can be replicated across multiple assemblies, improving manufacturing consistency. The fiber optic cable management device 200 may further facilitate maintenance by enabling access to specific fiber sections without disrupting the rest of the assembly. The management device 200 is configured to work in conjunction with the other components of the co-packaged optics assembly 100, creating an integrated system where optical signals can be efficiently routed between the various electronic and photonic elements. This integration may be particularly valuable in high-density computing environments where space constraints and thermal management considerations limit the available volume for fiber routing,

[0051] It should be noted that the cable management hardware, including all storage elements and their contained fiber routes, may be loaded onto a cable tray, which may form part of a fiber optic cable management assembly, as a complete unit. This preassembled unit can then be introduced to the co-packaged optics equipment box during final assembly, with some or all of the terminal connections to the faceplate, photonic integrated circuits, and external laser small form-factor pluggables remaining to be completed. This approach simplifies the assembly process and enables comprehensive testing of the optical pathways before final installation.

[0052] The preassembly capability provides several advantages in manufacturing and quality control. By assembling and testing the fiber management system as a separate unit, technicians can verify that all optical connections meet performance specifications before the system is integrated into the larger assembly. This approach reduces the risk of discovering connection issues after final assembly, when repairs would be more difficult and costly. Additionally, the preassembly process can be performed in a controlled environment optimized for fiber optic work, ensuring proper handling and verification of all connections.

[0053] The configuration of the co-packaged optics assembly 100, including its storage elements 200, represents an approach to managing the increasing complexity of optical interconnections in modern computing equipment. As data rates continue to increase and more optical connections are integrated directly into computing hardware, efficient fibermanagement becomes increasingly valuable for maintaining system performance and reliability.

[0054] FIG. 2A illustrates a perspective view of the fiber optic cable management device 200. The fiber optic cable management device 200 is configured for organizing and managing optical fibers within the co-packaged optics assembly 100 shown in FIG. 1C. The fiber optic cable management device 200 addresses the challenge of maintaining organized fiber paths in densely packed optical environments while ensuring accessibility for maintenance and reconfiguration. The fiber optic cable management device 200 serves as an intermediary’ between the optical connection points and the active components, providing a structured framework for fiber routing.

[0055] The fiber optic cable management device 200 comprises a plurality of stacked or adjacently aligned storage elements designated as 202ai through 202an, where "n" represents the total number of storage elements in the stack or alignment. For example, if the stack contains eight storage elements, they would be designated as 202ai, 202aa, 202as, and so on, up to 202as. Each storage element ensures consistent performance across the entire stack of storage elements. The storage elements may be fabricated from materials that combine rigidity for structural integrity with appropriate surface characteristics for fiber protection. These materials may include polymers that offer stability across the operating temperature range of the co-packaged optics assembly 100.

[0056] The fiber optic cable management device 200 helps manage excess cable length for fiber optic cables within the co-packaged optics assembly 100 of FIG. 1C. Fiber optic cables that are too short in length create tension and strain on connections, potentially leading to performance degradation or failure. Conversely, excessive unmanaged fiber optic cable length can result in tangling, pinching, or violating minimum bend radius specifications. The plurality of storage elements 202ai through 202anprovide a solution by accommodating these length variations in a controlled manner, enabling standardized cable lengths to be used for different routing paths throughout the assembly. This standardization reduces inventory complexity and simplifies manufacturing processes. By enabling a single standardized cable length to serve multiple routing paths with different distances, the storage elements reduce the number of distinct cable stock-keeping units (SKUs)required for assembly. This SKU reduction simplifies inventory management, reduces procurement complexity, and enables economies of scale in cable manufacturing. The storage elements also accommodate cable length variations that may arise from manufacturing tolerances or connector rework, ensuring that cables within acceptable tolerance ranges can still be deployed without compromising system performance.

[0057] Each storage element within the plurality of storage elements 202ai through 202anmay include at least a top panel, a bottom panel, a back panel, and an interior cavity positioned therein. The back panel of each storage element may extend vertically between the top panel and the bottom panel. The back panel of each storage element may be positioned adjacent the interior cavity of the storage element next to it. Thus, a back panel of a first storage element of the plurality of storage elements 202ai through 202anmay be positioned adjacent an interior cavity of a second storage element of the plurality of storage elements 202ai through 202an. This arrangement forms a series of vertically or horizontally aligned adjacent storage elements, creating a stacked configuration. These panels also ensure flush contact between adjacent elements when stacked. This stacking arrangement creates a compact structure that maximizes space utilization efficiency.

[0058] In some embodiments, the stack of storage elements may be oriented normal to the main board, or printed circuit board (PCB), of the co-packaged optics assembly, rather than parallel to it. This orientation facilitates access to individual storage elements by enabling them to be slid outward without interference from the board surface. The perpendicular orientation also enables more efficient use of the vertical space within the enclosure while maintaining clear access paths for maintenance operations. As used herein, orientation terminology such as “vertical” and “horizontal” may be relative to the illustrated orientation of the PCB, which is shown horizontally in the figures. In deployments where the PCB may be oriented differently, such as vertically in a book-like line card configuration, the physical directions would differ. Accordingly, for example, what is described as “vertical” relative to the illustrated PCB orientation would be horizontal in when the PCB itself is mounted vertically.

[0059] The stacked configuration enables segregation of different cable routes, preventing crossover and potential tangling while maintaining clear separation betweenindependent optical paths. The number of storage elements in the stack of the plurality of storage elements 202ai through 202ancan be tailored to the specific application, with more elements accommodating more complex routing scenarios or higher fiber counts. As will be discussed in greater detail in FIGs. 2B-2C, the interior of each element may contain one or more predetermined storage pathways that guide fiber optic cables while maintaining minimum bend radius specification. These storage pathways are configured with smooth transitions and gradual curves to reduce microbending, in which small-scale deviations in the fiber optic cable path can cause signal reduction or loss. The pathways within each element can accommodate multiple cable routes simultaneously, providing organized channel for each fiber to follow a predetermined path,

[0060] Each storage element in the stack of the plurality of storage elements 202ai through 202anmay also contain at least one aperture, opening, or hole through which a locking feature 207 may pass. In some embodiments, this opening may have a specialized shape, such as a keyhole configuration. The keyhole shape typically features a circular portion that accommodates the locking feature 207 when in its unlocked position, connected to a narrower slot portion that interacts with a corresponding feature on the locking feature 207 when rotated to its locked position. This interaction creates a mechanical interference that prevents the elements from moving independently when the locking feature 207 is in its first (locked) position. While the figures illustrate two locking features, any number of locking features may be contemplated.

[0061] The locking feature 207, shown as a rod-like structure, extends through each storage element in the stack of the plurality of storage elements 202ai through 202an. This locking feature 207 serves multiple functions as it provides physical alignment of the storage elements, ensures consistent spacing, and operates as a locking feature to secure the plurality of storage elements 202ai through 202an. The locking feature 207 interfaces with a mounting plate 206 positioned at the end of the stack. This mounting plate 206 distributes pressure evenly across the end of the stack when the locking feature is activated, preventing localized stress that could damage the storage elements.

[0062] The locking feature 207 may operate through a combination of mechanical interference and compressive force. When the locking feature 207 is rotated to its firstposition, an eccentric section or cam-like feature on the locking feature 207 interacts with the keyhole openings in each of the storage elements in the stack of the plurality of storage elements 202ai through 202an. This interaction both aligns the elements and creates compressive pressure throughout the stack. The compressive force presses the elements firmly together, eliminating any gaps between elements and creating a unified structure that maintains alignment of all fiber paths. This compression ensures that the storage elements remain in their designated positions, preventing any unwanted movement that could disturb the fiber routes contained within.

[0063] When maintenance or reconfiguration is desired, a technician can access the locking feature 207 and rotate the locking feature 207 to its second position. When the locking feature 207 is in the second position the locking feature 207 may be at least partially withdrawn from at least one storage element of the plurality of storage elements 202ai through 202an, When the locking feature 207 is in the second position the locking feature 207 may be fully withdrawn from the plurality of storage elements 202ai through 202an. When the locking feature 207 is in the second position the locking feature 207 may release at least one storage element of the plurality of storage elements 202ai through 202anfrom a fixed position and allow selective removal of at least one storage element of the plurality of storage elements 202ai through 202an. When the locking feature 207 is in the second position the at least one storage element of the plurality of storage elements 202ai through 202anmay be configured to slide outwards from between adjacent storage elements. The rotation of the locking feature 207 realigns the profile of the locking feature 207 with the wider portion of the keyhole openings, releasing the mechanical interference and relieving the compressive force on the stack. With the compressive force or forces released and the locking feature or features 207 partially or fully withdrawn, the storage elements from which the locking feature or features are withdrawn are free to move independently. To allow the removal of one optical cable subassembly or harness without the need to disconnect other cables, the ability to release the elements 202ai through 202anmay be combined with a hardware design that allows connectorized cable to be withdrawn from or through the various routing channels and guides.

[0064] The selective access capability enables maintenance procedures. For example, if a technician seeks to address an issue with the third element 202a3in the stack of the plurality of storage elements 202ai through 202an, the technician would first release the cable assembly that runs through element 202a3by disconnecting its optical connectors and feeding enough cable towards the element 202a3to allow it to move freely once released from the locking feature or features 207. The technician would then rotate the locking features 207 to their second positions, releasing the stack from compression, and withdraw the locking feature or features 207 at least far enough to free the third element 202a3. The technician could then slide the third element horizontally out of the stack of the plurality of storage elements 202ai through 202an, gaining full access to the fiber optic cable routes contained within that specific storage element. Throughout this process, the remaining storage elements would stay in position on the locking feature 207 and / or the cables that run through them, their cable storage pathways undisturbed. This capability reduces maintenance time and minimizes the risk of creating new problems while addressing existing ones, which is a common challenge in dense optical interconnection systems.

[0065] The fiber optic cable management device 200 also includes at least one opening 210 (see FIGs. 2B-2E) positioned within the top panel of the plurality of storage elements configured to enable the at least one optical fiber to pass through the plurality of storage elements. The fiber optic cable management device 200 may further include a cable guide 208 positioned within or on top of the at least one opening. The guide 208 may serve as a conduit for fiber optic cables, directing the fiber optic cables within each of the storage elements along specific storage pathways while maintaining appropriate bend radii. The interior surfaces of the guide 208 are typically smooth and rounded to prevent abrasion of cable sheaths. The dimensions of the guide 208 may accommodate the specified cable types without enabling excessive movement that could lead to position shifts over time. The guide 208 may also enable cables to enter or exit the stack at defined locations, providing structure to the fiber routing.

[0066] The cable guide 208 may also enable fiber optic cables to emerge at or close to a right angle (e.g., 90 degrees) to the plane defined by the back panel of the plurality of storage elements 202a i through 202an. The cable guide 208 allows for a controlled72transition point where cables can change their direction of travel without exceeding bend radius limitations. This capability is particularly valuable in densely packed environments where space optimization is useful.

[0067] The perpendicular exit feature works in conjunction with the internal storage pathways of the storage elements to create a comprehensive routing system. Cables can travel horizontally within a storage element, transition through the perpendicular exit, and then continue their route through adjacent elements or external components of the co¬ packaged optics assembly 100. This routing capability maximizes space utilization and provides flexibility in system design, enabling optical connections to be made between components that may not be coplanar within the overall assembly.

[0068] The fiber optic cable management device 200 may also include the opening 210 to permit fiber optic cables to pass through the plurality of storage elements 202ai through 202an. The opening 210 is configured with smooth transitions at its edges to prevent sharp bends in the fiber optic cables as they pass through. The dimensions of the opening are calculated to accommodate the required number of fiber optic cables while maintaining sufficient separation between adjacent fibers to prevent unwanted interactions or microbending losses. The opening 210 works in coordination with the cable guide 208 to create a comprehensive fiber optic cable routing system within the stacked plurality of storage elements 202ai through 202an.

[0069] FIG. 2A illustrates fiber optic cables 218a, 218b, each connected to the one or more connection features of the one or more fiber optic connection device and a portion of each stored within the housing of the second fiber optic connection device 102b and the third fiber optic connection device 102c of FIG. 1C, stored in the storage elements 202ai through 202an. As will be discussed in greater detail below in connection with FIGs. 2B-2C, within the interior cavity of the storage elements 202at through 202anthe fiber optic cables 218a, 218b may be routed and stored and may then pass through the opening 210 with guidance from the cable guide 208. The fiber optic cables 218a, 218b may be connected to the one or more photonic chips 232a, 232b, 232c, and thus ASIC 230, as discussed above. As shown in FIG. 2A, while fiber optic cables 218a, 218b may pass through the opening 210 with guidance from the cable guide 208, other fiber optic cables216 may pass through a different channel of the fiber optic cable management device 200 and be guided to the one or more photonic chips by a routing structure 220.

[0070] FIGs. 3A and 3B illustrate schematic views of a plurality of fiber optic connection devices positioned on the co-packaged optics assembly 100 of FIG. 1C, including coplanar sections and a free-space bridge. As discussed above, the fiber optic cables 318 may be partially stored within the fiber optic connection devices 102a, 102b, 102c, 102d and may be routed and stored through storage elements and further routed to the ASIC by a routing structure 302. Within the storage elements 202ai through 202an(not shown), the pathways for fiber optic cables 318 include successive straight sections that lie in the same plane, referred to as coplanar sections. These coplanar sections represent an approach to simplify fiber routing and reduce stress on the fibers.

[0071] When a fiber is configured to transition between different routing elements, it benefits if the tangents to the cable segment where it enters the two adjacent elements are parallel or otherwise coplanar. The coplanar design ensures that these transitions occur within a defined plane, eliminating complex fiber or cable configurations that can be difficult to control and reproduce consistently during assembly. The coplanar sections occur on either side of transitions or openings and enable what can be called "free-space bridges," A free-space bridge is a section where a fiber optic cable transitions between guided paths, ideally following a coplanar curve such as a circular arc or S-bend. The planar curve of the free-space bridge may comprise a circular arc or an S-bend, enabling simple and repeatable fiber routing. Additionally, the use of free-space bridges reduces mechanical constraints imposed by rigid routing structures, allowing for a more adaptable fiber management system. This design, including the storage elements discussed above, minimizes optical signal loss by maintaining suitable bend radii, reducing the likelihood of micro-bending and attenuation effects that could degrade performance. By ensuring that fiber optic cables follow predictable paths through the storage elements, maintenance and modifications become more manageable, particularly in high-density cable co-packaged optics environments where access to individual fibers may be limited.

[0072] The fiber optic cables 318 may have tangent vectors V1 and V2, as shown, that are parallel and can be joined by an S-bend. VI, V2 and the S-bend are coplanar. Thesefree-space bridges are carefully configured to maintain minimum bend radius requirements while providing flexibility in routing. The beginning and ending tangents of each free- space bridge are positioned in the same plane, enabling the fiber to follow a natural path dictated by its stiffness and elasticity. The coplanar tangent configuration enables the free- space bridge to be made without twisting the cable axially, avoiding poorly controlled out-of-plane deflections that can occur when entry and exit tangents are not coplanar. This improves assembly repeatability, as the operator need only ensure that the cable is untwisted in the hardware guides and that the correct length of cable is deployed in the free-space section. This approach eliminates the need for complex guiding structures at transition points, simplifying the overall design while maintaining reliable and reproducible fiber routing.

[0073] The storage element stack may also include a polarization-maintaining storage element 204, which may be configured for managing polarization-maintaining fibers (PMF). Polarization-maintaining fibers represent a specialized category of optical fibers that preserve the polarization state of light traveling through them. The polarizationmaintaining storage element 204 may be configured to manage PMF cables that originate from external laser small form-factor pluggables (ELSFPs) mounted in the front panel. In some embodiments, the PMF cables may be furcated at an adapter within the cable tray to distribute the PMF bundle to different photonic integrated circuit connectors, enabling a single PMF source to serve multiple optical channels. The polarization-maintaining fibers carry high optical power levels from the laser modules to the photonic integrated circuits, where the optical power is split and modulated onto transmission fibers. The polarization¬ maintaining storage element 204 may have a different guide design than the signal cable storage elements to accommodate the specific handling requirements of polarization¬ maintaining fibers, which may include different bend radius specifications or routing constraints compared to standard signal cables.

[0074] In some embodiments, the storage elements 202ai through 202an may incorporate visual identification systems such as color coding or physical markers. These visual cues can take multiple forms, including colored sections molded into the elements, applied color bands or labels, or textured regions that provide tactile identification. Theidentification system might use different colors to indicate different classes of fibers (e.g., single-mode, polarization-maintaining) or to differentiate between routing paths serving different destinations within the system. This visual identification simplifies both initial assembly and subsequent maintenance by providing clear visual cues that help technicians trace specific fibers through the complex routing system.

[0075] In some embodiments, the visual identification system may extend beyond the storage elements to include color coding or physical markers on routing structures, cable trays, and other cable management hardware within the fiber optic cable management device 200. For example, different routing channels within the cable tray may be color- coded to indicate their destination connection points, such as front photonic integrated circuits versus rear photonic integrated circuits. This approach of color-coding the routing hardware rather than individual cables simplifies assembly by providing fixed visual references that remain consistent across multiple assemblies, reducing the likelihood of routing errors during initial installation or subsequent maintenance operations.

[0076] In some embodiments, the fiber optic cable management device 200 may feature different numbers of storage elements, depending on the specific installation. A system with fewer, simpler optical interconnections might utilize a smaller number of storage elements, while a high-density system with numerous complex routes might require a taller stack. In some embodiments, the thicknesses of individual storage elements within the same stack may vary, with thicker elements allocated to routes with higher fiber counts or more complex routing specification. This variable thickness approach enables the storage capacity to be optimized for the specific routing specification of each layer in the stack.

[0077] The locking feature 207 may take different forms in various embodiments while maintaining its core functionality of securing and releasing the stack. While the illustrated version shows a rod-like structure with rotational actuation, other implementations might utilize different mechanisms. These could include sliding locks that move linearly rather than rotationally, snap-fit connectors that engage with detents in the storage elements, or hinged elements that swing into and out of engagement with the stack. Each of thesevariations would still serve the functions of aligning the stack, applying compressive force when in the first position, and releasing that force when moved to the second position.

[0078] In some embodiments, the opening 210 may vary to accommodate specific routing specifications. In some embodiments, there may be multiple smaller openings instead of a single larger one, enabling separation of fiber groups. In some embodiments, there may be angled or curved channels within the opening to facilitate gradual direction changes for the fibers as they pass through. The size, shape, and position of the opening can be customized for specific applications, providing flexibility in system design while maintaining the core functionality of enabling fibers to pass through the stack in a controlled manner. In some embodiments, there may be wider slots or openings for larger cable bundles, while others might include narrower shaped openings for individual fiber routing. In some embodiments there may be multiple parallel openings to create separate routing channels within each storage element, providing increased organization and separation between fiber groups. The depth, width, and contour of the opening can be tailored to the specific cable types used in the system, ensuring proper support and bend radius control throughout the fiber path,

[0079] This fiber management approach provides a structured, maintainable solution for the complex fiber routing specifications of modern co-packaged optics systems. By combining stackable elements with selective access capabilities and routing options, the fiber optic cable management device 200 addresses the challenges of fiber organization in high-density computing environments. The system's flexibility accommodates various fiber types and routing specifications while maintaining consistency in the overall architecture, providing a scalable solution for current and future optical interconnection applications.

[0080] Referring now to FIG. 2B which illustrates a detailed view of a storage element 202anfrom the series of storage elements as shown in FIG. 2A. This provides a close-up perspective of the internal structure and fiber routing mechanisms within a single storage element. The storage element 202ancomprises a body with features configured to guide and store fiber optic cables while maintaining appropriate bend characteristics.

[0081] The storage element 202anincludes multiple cable management features, identified as cable management features 216a and 216b. These cable management features serve as guides for fiber optic cables, providing defined paths for the cables to follow. The cable management features 216a and 216b include curved surfaces that support the fiber optic cables as they change direction, ensuring that the cables maintain a bend radius greater than the minimum specified for the particular cable type being used. The storage element 202anincludes holes or apertures 217a and 217b that extend through the upper surface to the lower surface of each storage element and are configured to receive the locking feature (207, shown in FIG, 2A) that secures the stack of storage elements. These holes 217a and 217b may have a keyhole shape with a circular portion connected to a narrower slot. This configuration enables the locking feature to pass through the hole and then engage with the narrower portion when rotated, creating a compressive force and mechanical lock that secures the storage elements in position relative to other elements m the stack.

[0082] An opening 210 can be seen m the storage element 202an, providing a route for fiber optic cables to pass through the element. This opening 210 enables cables to exit perpendicular to the plane of the storage element, enabling routing through the stack of storage elements in the device 200. The opening 210 is configured with smooth transitions to prevent sharp bends in the fiber optic cables as they change direction.

[0083] As shown in FIG. 2B, a fiber optic cable 212 is routed through the storage element 202an, following a path guided by the cable management features 216a and 216b. The path denoted by 214 represents part of an alternative path, for cable storage, that accommodates a particular length of fiber optic cable within the element. Unlike previous accumulator designs where fiber paths from the accumulator were essentially in the accumulator plane with no well-defined exit paths distinct from storage paths, the storage elements disclosed herein provide defined exit pathways that are separate from the storage pathways. This separation enables independent optimization of storage capacity and exit routing. The distinct exit pathways provide a direct route from the storage pathways to the opening 210, ensuring that regardless of which storage pathway is used to accommodate cable length, the cable approaches the opening at a consistent angle and position. Inprevious designs, the fiber paths were essentially confined to the accumulator plane with cables exiting through the same apertures used for entry, with no well-defined exit paths distinct from storage paths. The distinct exit pathways disclosed herein enable cables to emerge at right angles to the storage element plane through the opening 210, supporting tight packing density while maintaining organized routing. This path 214 provides a defined route that the fiber optic cable follows, ensuring that the cable is properly supported and maintains appropriate bend characteristics throughout its length. The cable storage path 214 shown in FIG. 2B represents one possible routing configuration within the storage element 202an. In this configuration, the fiber optic cable 212 follows a relatively direct path through the element, with the cable management features 216a and 216b guiding the cable through curves that maintain appropriate bend radii. This routing option might be selected when the distance between connection points requires a shorter length of cable to be stored within the storage element 202an. The storage element 202anmay also incorporate distinct exit pathways that direct the fiber optic cable 212 toward the opening 210. These exit pathways are separate from the storage pathways and are configured to guide the cable along a direct route to opening 210, ensuring proper alignment with connection ports or adjacent elements in the stack. The exit pathways maintain appropriate bend radius control as the cable approaches the opening, preventing signal degradation at this critical transition point.

[0084] The cable management features 216a and 216b work together to create a defined path for the fiber optic cable. As the cable enters the storage element 202an, it may first encounter cable management feature 216a, which guides it through a curve. The cable then continues along a straight section before encountering cable management feature 216b, which guides it through another curve. This sequence of curves and straight sections creates a path that accommodates a specific length of cable within the storage element while maintaining proper support and bend characteristics.

[0085] FIG. 2C illustrates an alternative configuration of a storage element 202an'. This shows a variation in how fiber optic cables can be routed within the storage element. While the basic structure of the storage element 202an' is similar to that shown in FIG. 2B, the cable routing configuration differs.

[0086] In FIG. 2C, the storage element 202an' includes cable management features 216a and 216b and holes 217a and 217b, which function similarly to those described for FIG. 2B. However, in this configuration, a fiber optic cable 212 may have a different storage path, shown as 214'. This path includes additional curves and loops, providing storage for a greater length of cable within the storage element.

[0087] A router feature 213 may be present in the storage element 202an'. This router feature 213 provides additional support and guidance for the fiber optic cable, and may allow for more options for routing extra cable without interfering with the exiting of the cable at the opening 210. Thus, router feature 213 allows for increasing the storage capacity of the storage element while still allowing the central exit feature at the opening 210. The storage path 214' shown in FIG, 2C represents a configuration that accommodates excess cable length. When the distance between connection points is shorter than the standardized cable length, the excess cable may be stored in a manner that maintains appropriate bend characteristics. The path 214' creates a series of curves and loops that effectively store this excess length while ensuring that the cable may not bend more sharply than its minimum specified bend radius. Even with the more complex storage configuration, the storage element 202an' maintains distinct exit pathways that guide the fiber optic cable 212 toward opening 210. These exit pathways ensure that regardless of how much excess cable is stored within the element, the cable approaches opening 210 at the correct angle and position for proper connection to downstream components or passage to adjacent elements in the stack. This separation between storage and exit pathways enables independent optimization of each function.

[0088] The fiber optic cable 212’ of FIG 2C may weave through the storage element 202an', following a path that includes multiple curves. The cable may first pass through an initial curve guided by cable management feature 216a, then continue through additional curves supported by the router feature 213, before finally exiting through a curve guided by cable management feature 216b. This weaving pattern effectively stores excess cable length within the confined space of the storage element.

[0089] The ability to configure storage elements for different cable lengths, as illustrated by FIGs. 2B and 2C, provides flexibility in system configuration and assembly.In some embodiments, a single storage element may combine aspects of both configurations shown in FIGs. 2B and 2C. For example, one section of the element might provide direct routing for certain cables, while another section incorporates additional curves and router features for cables requiring excess length storage. This combined approach maximizes the utility of each storage element, potentially reducing the total number of elements required in the stack.

[0090] The cable management features 216a, 216b and router feature 213 can be configured with various profiles to accommodate different cable types or quantities. For fibers containing multiple parallel optical fibers, these features might include wider channels with support surfaces sized to accommodate the ribbon width. For individual fibers, narrower, more contoured channels might be used. The specific dimensions and curvatures of these features can be tailored to the bend characteristics of the cables they are designed to guide.

[0091] The configurations shown in FIGs. 2B and 2C address different scenarios in fiber length management. The configuration in FIG. 2B, showing storage element 202anwith fiber optic cable 212 following storage path 214, might be selected when the standardized cable length closely matches the specified routing distance, with minimal excess to store. The configuration in FIG. 2C, showing storage element 202an’ with fiber optic cable 212’ following storage path 214’ through router feature 213, provides a solution when the standardized cable length exceeds the routing distance, requiring excess length storage. Both configurations maintain proper bend radius control, preventing signal degradation or physical damage to the fibers that could result from exceeding minimum bend radius specifications.

[0092] In addition to the predetermined storage pathways that accommodate different cable lengths, each storage pathway may include slack capacity that enables fine adjustment of the stored cable length within that pathway. As shown in FIG. 2B, the storage element 202an may include a slack storage cavity defined by an outer boundary 219, such as a wall of the storage element, and an inner boundary, such as a bend control feature that maintains the minimum bend radius of the fiber optic cable. The fiber optic cable 212 may be positioned at various locations between the outer boundary 219 and the inner boundary,with positions closer to the outer boundary 219 storing a greater length of cable and positions closer to the inner boundary storing a lesser length of cable. A fiber position 221 represents an intermediate position within the slack storage cavity along storage path 214. This continuous adjustment capability accommodates manufacturing tolerances in cable length and variations that may be introduced during connector rework, ensuring that cables within acceptable tolerance ranges can be deployed without requiring selection of a different predetermined storage pathway. The bend control feature ensures that the minimum bend radius is maintained regardless of where the cable is positioned within the slack storage cavity.

[0093] FIG. 2D illustrates a top view of the fiber optic cable management device 200, providing a perspective on how the stacked storage elements 202ai through 202anare arranged. This view illustrates the spatial relationship between the individual elements and reveals how fiber optic cables pass through the stack. This illustrates multiple storage elements with each element positioned adjacent to each other,

[0094] The locking features 207 and 207’, visible as rod-like structures, extend through the entire stack of storage elements. These locking features pass through holes in each storage element, aligning the stack and providing the mechanism for securing the elements in place. The locking features 207 and 207’ connect to mounting plates 206 and 206’ respectively, which distribute pressure across the ends of the stack when the locking features are in their secured positions. This arrangement creates a stable, unified structure while still enabling for selective access when the locking features are rotated to their release positions and partially or fully withdrawn.

[0095] As seen in FIG. 2D, fiber optic cables 212a1through 212anemerge from an opening in the storage elements. Each cable may originate from a different element in the stack, with cable 212a1coming from element 202a1, cable 212a2from element 202a2, and so forth. This arrangement enables for organized separation of fiber routes, with each storage element handling a specific set of connections. The cables exit the stack in a controlled manner, maintaining appropriate bend radii as they transition from their storage paths to external connections.

[0096] The top view in FIG. 2D reveals how’ a technician can access specific storage elements within the stack. When maintenance or reconfiguration is desired, the technician would first rotate the locking features 207 and 207’ to their release positions and partially or fully withdraw’ the locking features 207 and 207’ from the stack of storage elements. This rotation, and withdrawal, relieves the compressive force on the stack and enables individual elements to be moved independently. The ability to access specific elements within the stack provides valuable flexibility during maintenance operations. For example, if a cable assembly that is routed in the fifth element 202as is designated for replacement, the technician can locate and isolate just that element without disturbing the rest of the assembly. After having disconnected the appropriate optical connectors and manipulated the cable to be replaced to provide slack at the fifth element 202as, they would rotate the locking features 207 and 207’ to their release positions, withdraw the locking features 207 and 207’ at least far enough for them to disengage with the fifth storage element, and then slide that storage element outwards. This process preserves the integrity of connections in the other elements, minimizing the scope and complexity of the maintenance operation. When the cable guide 208 is removed and the cables for the storage element to be removed have been released, fiber optic cables from other storage elements that pass through the opening in the element to be removed can be displaced, such as by springing upward, so that they no longer lie within the opening of the element being removed. This displacement allows the element to be slid lengthwise and lifted out without interfering with or disconnecting the fiber optic cables from the other storage elements.

[0097] FIG. 2E provides a cross-sectional view of how the fiber optic cables 212a1through 212anpass through openings in the storage elements. These openings are configured to guide the cables while maintaining appropriate bend radii, preventing signal degradation that could result from excessively tight bends. As illustrated, the cables emerge from the stack in a perpendicular direction relative to the plane of the storage elements, demonstrating the three-dimensional routing capability of the system. The storage elements 202a1through 202anvisible in the cross-sectional view contain internal channels and support structures that guide the fiber optic cables along their designated paths. These internal features ensure that each cable follow’s a predetermined route through the element,maintaining proper separation from other cables and appropriate bend characteristics throughout its path. The internal features provide for reliable fiber management, preventing tangling, pinching, or excessive bending that could compromise signal integrity.

[0098] Additionally, the fiber optic cable management device 200 may incorporate cable guides with a limited free cross-sectional area. These narrow guides constrain the movement of individual cables, ensuring they remain in their designated positions regardless of the orientation of the equipment box. This feature may be particularly valuable in systems that may be oriented differently during assembly, operation, and maintenance. For example, the assembly might be mounted vertically during normal operation but placed horizontally during assembly or maintenance procedures. The constrained cable guides prevent the fibers from shifting position during these orientation changes, helping to maintain consistent optical performance. To allow for complete removal and replacement of individual connectorized cable subassemblies, these cable guides need to be large enough to allow for the passage of the connectors. Alternatively, they may be open on one side or provided with removable lid or lids.

[0099] The limited movement provided by the cable guides is achieved through the channels which are sized to accommodate the fiber optic cables with minimal excess space, preventing lateral movement that could lead to position shifts over time. In some embodiments, there may be included covers for each management subunit, further constraining the cables and ensuring they remain in their designated paths. This combination of narrow guides and protective covers creates a stable environment for the fiber optic cables throughout the operational life of the assembly.

[0100] In some embodiments, the storage elements may include integrated strain relief at cable entry and exit points, protecting the fibers from tension or sharp bends where they transition between guided and unguided sections.

[0101] In some embodiments, the fiber optic cable management device 200 might feature variations in the engagement mechanism. While FIGs. 2D and 2E show dual locking features 207 and 207’, some implementations might use a single central locking feature or multiple smaller features distributed across the width of the storage elements.The specific arrangement would depend on factors such as the size and shape of the storage elements, the expected mechanical stresses during operation, and the desired accessibility for maintenance operations.

[0102] In some embodiments, there may be additional protection features for the fiber optic cables. For example, the openings where cables exit the stack might include soft bushings or grommets to prevent abrasion of cable sheaths. In some embodiments, there may be included protective covers that enclose the entire stack of storage elements, providing additional mechanical protection and dust exclusion.Example Flowchart] s)

[0103] Embodiments of the present disclosure provide various methods for accessing and maintaining storage elements in a fiber optic cable management device, such as described herein. Various examples of the operations performed in accordance with some embodiments of the present disclosure are now provided with reference to FIG. 4. Unless otherwise expressly stated, it is not intended that any method set forth herein be construed as requiring that its steps be performed in a specific order.

[0104] FIG. 4 illustrates a flowchart according to an example method 400 of accessing storage elements and maintaining fiber optic cables in a fiber optic cable management device. The method 400 includes providing a housing with stacked storage elements at operation 410. For example, as described herein, the fiber optic cable management device may include or be associated with a housing that contains the plurality of storage elements. The housing may contain multiple storage elements aligned adjacently in a series, each configured to maintain minimum bend radius requirements for optical fibers.

[0105] The method 400 may further include rotating a locking feature to an unlocked position and at least partially withdrawing the locking feature from the storage elements at operation 420. For example, as described herein, the locking feature may be rotated from a first position where it applies compressive force to secure the storage elements to a second position where the storage elements are relieved of this compressive force while still remaining aligned.

[0106] The method 400 may further include identifying a storage element to be fixed or replaced at operation 430. This operation may involve determining which specific storage element of the plurality of storage elements contains the fiber optic cable selected for maintenance or replacement.

[0107] The method 400 may further include lifting or sliding the selected storage element from the stack of the plurality' of storage elements at operation 440. For example, as described herein, with the elements relieved of compressive force, the identified storage element may be horizontally removed from the stack while all other elements remain in position on the locking feature.

[0108] The method 400 may further include adjusting or replacing the specific fiber optic cable and returning the storage element back to the stack of the plurality of storage elements at operation 450. The method 400 may further include rotating the locking feature to a locked position when complete at operation 460. After maintenance or replacement operations are completed and the storage element is returned to the stack, the locking feature may be reinserted and rotated back to its first position to reapply compressive force and secure all elements in a fixed position relative to one another.

[0109] It should be appreciated that the method 400 may include other operations and that the operations described above may be modified depending on the specific requirements of the fiber optic cable management device.Conclusion

[0110] Many modifications and other embodiments of the disclosures set forth herein may come to mind to one skilled in the art to which these present disclosures pertain having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the embodiments of the present disclosure are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the present disclosure. Moreover, although the foregoing descriptions and the associated drawings describe example embodiments in the context of certain example combinations of elements and / or functions, it should be appreciated that different combinations of elements and / or functionsmay be provided by alternative embodiments without departing from the scope of the present disclosure. In this regard, for example, different combinations of elements and / or functions than those explicitly described above are also contemplated within the scope of the present disclosure. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

THAT WHICH IS CLAIMED:

1. A fiber optic cable management device comprising:a plurality of storage elements, each storage element of the plurality of storage elements comprising at least a top panel, a bottom panel, a back panel and an interior cavity positioned therein, the back panel extending vertically between the top panel and the bottom panel, and at least one aperture extending through the back panel, wherein a back panel of a first storage element of the plurality of storage elements is positioned adjacent an interior cavity of a second storage element of the plurality of storage elements;each storage element including at least one cable management feature positioned therein and configured to interact with at least one fiber optic cable positioned in the interior cavity to maintain a minimum bend radius of the at least one fiber optic cable, wherein each storage element defines one or more predetermined storage pathways, each of the one or more predetermined storage pathways providing for a different length variation of the at least one fiber optic cable within the interior cavity; andeach storage element comprising an opening from the interior cavity to enable the at least one fiber optic cable to pass therethrough.

2. The device of claim I, further comprising a locking feature, having a first position and a second position, configured to extend through the at least one aperture of each storage element of the plurality of storage elements and configured to secure the plurality of storage elements in a fixed position relative to one another.

3. The device of claim 2, wherein when the locking feature is in the second position:the locking feature is at least partially withdrawn from at least one storage element of the plurality of storage elements;the locking feature releases at least one storage element of the plurality of storage elements from the fixed position and allows selective removal of at least one storage element of the plurality of storage elements; andthe at least one storage element of the plurality of storage elements is configured to slide outwards from between adjacent storage elements.

4. The device of any one of claims 2-3, wherein when the locking feature is in the first position, the locking feature holds the plurality of storage elements against one another through a compressive force, and wherein the locking feature is rotatable between the first position and the second position.

5. The device of claim 1, wherein the opening is configured to allow the at least one fiber optic cable to exit perpendicular to a plane defined by the top panel of the storage element.

6. The device of claim 1, wherein the opening of the plurality of storage elements are aligned to enable the at least one fiber optic cable to pass through adjacent storage elements of the plurality of storage elements.

7. The device of claim 1, wherein each storage element of the plurality of storage elements comprises one or more storage pathways, and wherein each storage pathway of the one or more storage pathways is configured to accommodate a different length of the at least one fiber optic cable.

8. The device of any one of claims 5-7, wherein the at least one fiber optic cable from one storage element of the plurality of storage elements pass through the openings of adjacent storage elements, and wherein the fiber optic cables are configured to be displaced when an adjacent storage element is removed to permit removal of the adjacent storage element without disconnecting the fiber optic cables.

9. The device of claim 1, further comprising a cable guide positioned adjacent to the plurality of storage elements, the cable guide configured to direct the at least one fiber optic cable along a predetermined bend radius.

10. The device of claim 1, wherein at least one storage element of the plurality of storage elements comprises a polarization-maintaining storage element configured to manage polarization-maintaining fibers.

11. The device of claim 1, wherein at least one fiber optic cable transitions between routing elements via a free-space bridge, wherein tangent vectors of the fiber optic cable at entry and exit points of the free-space bridge are coplanar, enabling the free-space bridge to follow a planar curve, and wherein the planar curve comprises a circular arc or an S-bend.

12. The device of any one of claims 9-11, wherein at least one of the plurality of storage elements or a routing structure includes a visual identification system comprising color coding or physical markers.

13. A fiber optic cable management device for a co-packaged optics assembly, the fiber optic cable management device comprising:a plurality of storage elements, each storage element of the plurality of storage elements comprising at least a top panel, a bottom panel, a back panel and an interior cavity positioned therein, the back panel extending vertically between the top panel and the bottom panel, and at least one aperture extending through the back panel, wherein a back panel of a first storage element of the plurality of storage elements is positioned adjacent an interior cavity of a second storage element of the plurality of storage elements;each storage element including at least one cable management feature positioned therein and configured to interact with at least one fiber optic cable positioned in the interior cavity to maintain a minimum bend radius of the at least one fiber optic cable, wherein each storage element defines one or more predetermined storage pathways, each of the one or more predetermined storage pathways providing for a different length variation of the at least one fiber optic cable within the interior cavity;each storage element comprising an opening from the interior cavity to enable the at least one fiber optic cable to pass therethrough; anda locking feature, having a first position and a second position, configured to extend through the at least one aperture of each storage element of the plurality of storage elements and configured to secure the plurality of storage elements in a fixed position relative to one another.

14. The assembly of claim 13, wherein when the locking feature is in the second position, the locking feature is at least partially withdrawn from at least one storage element of the plurality of storage elements, releases at least one storage element from the fixed position, and allows selective removal of at least one storage element configured to slide outwards from between adjacent storage elements.

15. The assembly of any one of claims 13-14, wherein the opening of the plurality of storage elements are aligned to enable the at least one fiber optic cable to pass through adjacent storage elements of the plurality of storage elements,16. The assembly of claim 13, wherein the at least one fiber optic cable from one storage element of the plurality of storage elements pass through the openings of adjacent storage elements, and wherein the fiber optic cables are configured to be displaced when an adjacent storage element is removed to permit removal of the adjacent storage element without disconnecting the fiber optic cables.

17. The assembly of claim 13, wherein at least one fiber optic cable transitions between routing elements via a free-space bridge, wherein tangent vectors of the fiber optic cable at entry and exit points of the free-space bridge are coplanar, enabling the free-space bridge to follow a planar curve, and wherein at least one fiber optic cable follows a path with a first tangent vector and a second tangent vector that are parallel and coplanar and joined by an S-bend.

18. The assembly of claim 17, wherein at least one of the plurality of storage elements or a routing structure includes a visual identification system comprising color coding or physical markers.

19. A method of accessing a storage element in a fiber optic cable management device, the method comprising:providing a housing with a plurality of storage elements aligned in a stacked configuration, each storage element configured to maintain a minimum bend radius for at least one fiber optic cable;rotating a locking feature from a first position to a second position and at least partially withdrawing the locking feature from the plurality of storage elements;identifying a storage element of the plurality of storage elements to be accessed; disconnecting optical connectors associated with a fiber optic cable routed through the identified storage element while fiber optic cables routed through other storage elements of the plurality of storage elements remain connected;removing the identified storage element from the stacked configuration; and returning the storage element to the stacked configuration after adjustment of the at least one fiber optic cable.

20. The method of claim 19, wherein removing the identified storage element comprises sliding the identified storage element outwards from between adjacent storage elements while other storage elements of the plurality of storage elements remain in position on the locking feature, and wherein the method further comprises rotating the locking feature from the second position to the first position to reapply a compressive force securing the plurality of storage elements after returning the storage element to the stacked configuration.

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